Tuesday, January 24, 2012

Tuesday, January 3, 2012

SharePoint 2010 Limits and boundaries

Reference : http://technet.microsoft.com/en-us/library/cc262787.aspx#Overview

Web application limits
The following table lists the recommended guidelines for Web applications.

Limit
Maximum value
Limit type
Notes
Content database
300 per Web application
Supported
With 300 content databases per Web application, end user operations such as opening the site or site collections are not affected. But administrative operations such as creating a new site collection will experience decrease in performance. We recommend that you use Windows PowerShell to manage the Web application when a large number of content databases are present, because the management interface becomes slow and difficult to navigate.
Zone
5 per Web application
Boundary
The number of zones defined for a farm is hard-coded to 5. Zones include Default, Intranet, Extranet, Internet, and custom.
Managed path
20 per Web application
Supported
Managed paths are cached on the Web server, and CPU resources are used to process incoming requests against the managed path list.
Exceeding 20 managed paths per Web application adds more load to the Web server for each request.
If you plan to exceed twenty managed paths in a given Web application, we recommend that you test for acceptable system performance.
Solution cache size
300 MB per Web application
Threshold
The solution cache allows the InfoPath Forms service to hold solutions in cache in order to speed up retrieval of the solutions. If the cache size is exceeded, solutions are retrieved from disk, which may slow down response times. You can configure the size of the solution cache by using the Windows PowerShell cmdlet Set-SPInfoPathFormsService. For more information, see Set-SPInfoPathFormsService.
Site collection
250,000 per Web application
Supported
The maximum recommended number of site collections per Web application is 250,000.
Note that this limit is affected by other factors that might reduce the effective number of site collections that can be supported by a given Web application. Care must be exercised to avoid exceeding supported limits when a container object, such as a content database, contains a large number of other objects.
For example, in a farm that contains a large number of Web applications, the total number of site collections might reach a number that cannot effectively be supported by farm resources. This can be true even when both the number of Web applications per farm and the number of site collections per Web application fall within their supported limits.
Similarly, if a farm contains a smaller total number of content databases, each of which contains a large number of site collections, farm performance might be adversely affected long before the supported limit for the number of site collections is reached.
The following case illustrates this point.
Farm A contains a Web application that has 200 content databases, a supported configuration. If each of these content databases contains 200 site collections, the total number of site collections in the Web application will be 40,000, which falls within supported limits. However, if each content database contains 2,000 site collections, even though this number is supported for a content database, the total number of site collections in the Web application will be 400,000, which exceeds the limit for the number of site collections per Web application.
Web server and application server limits
The following table lists the recommended guidelines for Web servers on the farm.

Limit
Maximum value
Limit type
Notes
Application pools
10 per Web server
Supported
The maximum number is determined by hardware capabilities.
This limit is dependent largely upon:
  • The amount of RAM allocated to the Web servers
  • The workload that the farm is serving, that is, the user base and the usage characteristics (a single highly active application pools can reach 10 GB or more)
Content database limits
The following table lists the recommended guidelines for content databases.

Limit
Maximum value
Limit type
Notes
Content database size (general usage scenarios)
200 GB per content database
Supported
We strongly recommended limiting the size of content databases to 200 GB, except when the circumstances in the following rows in this table apply.
If you are using Remote BLOB Storage (RBS), the total volume of remote BLOB storage and metadata in the content database must not exceed this limit.
Content database size (all usage scenarios)
4 TB per content database
Supported
Content databases of up to 4 TB are supported when the following requirements are met:
  • Disk sub-system performance of 0.25 IOPs per GB. 2 IIOPs per GB is recommended for optimal performance.
  • You must have developed plans for high availability, disaster recovery, future capacity, and performance testing.
You should also carefully consider the following factors:
  • Requirements for backup and restore may not be met by the native SharePoint Server 2010 backup for content databases larger than 200 GB. It is recommended to evaluate and test SharePoint Server 2010 backup and alternative backup solutions to determine the best solution for your specific environment.
  • It is strongly recommended to have proactive skilled administrator management of the SharePoint Server 2010 and SQL Server installations.
  • The complexity of customizations and configurations on SharePoint Server 2010 may necessitate refactoring (or splitting) of data into multiple content databases. Seek advice from a skilled professional architect and perform testing to determine the optimum content database size for your implementation. Examples of complexity may include custom code deployments, use of more than 20 columns in property promotion, or features listed as not to be used in the over 4 TB section below.
  • Refactoring of site collections allows for scale out of a SharePoint Server 2010 implementation across multiple content databases. This permits SharePoint Server 2010 implementations to scale indefinitely. This refactoring will be easier and faster when content databases are less than 200 GB.
  • It is suggested that for ease of backup and restore that individual site collections within a content database be limited to 100 GB. For more information, see Site collection limits.
For more information on SharePoint Server 2010 data size planning, see Storage and SQL Server capacity planning and configuration (SharePoint Server 2010).
Important:
Content databases of over 4 TB, except for use in document archive scenarios (described in the row below), are not recommended. Upgrading of site collections within these content databases is likely to be very difficult and time consuming.
It is strongly recommended that you scale out across multiple content databases, rather than exceed 4 TB of data in a single content database.
Content database size (document archive scenario)
No explicit content database limit
Supported
Content databases with no explicit size limit for use in document archive scenarios are supported when the following requirements are met:
  • You must meet all requirements from the “Content database size (all usage scenarios)” limit earlier in this table, and you should ensure that you have carefully considered all the factors discussed in the Notes field of that limit.
  • SharePoint Server 2010 sites must be based on Document Center or Records Center site templates.
  • Less than 5% of the content in the content database is accessed each month on average, and less than 1% of content is modified or written each month on average.
  • Do not use alerts, workflows, link fix-ups, or item level security on any SharePoint Server 2010 objects in the content database.
Note:
Document archive content databases can be configured to accept documents from Content Routing workflows.
For more information about large-scale document repositories, see Estimate Performance and Capacity Requirements for Large Scale Document Repositories (http://technet.microsoft.com/en-us/library/ff608068.aspx), and the Typical large-scale content management scenarios section of the article Enterprise content storage planning (SharePoint Server 2010).
Content database items
60 million items including documents and list items
Supported
The largest number of items per content database that has been tested on SharePoint Server 2010 is 60 million items, including documents and list items. If you plan to store more than 60 million items in SharePoint Server 2010, you must deploy multiple content databases.
Site collections per content database
2,000 recommended
5,000 maximum
Supported
We strongly recommended limiting the number of site collections in a content database to 2,000. However, up to 5,000 site collections in a database are supported.
These limits relate to speed of upgrade. The larger the number of site collections in a database, the slower the upgrade.
The limit on the number of site collections in a database is subordinate to the limit on the size of a content database that has more than one site collection (200 GB). Therefore, as the number of site collections in a database increases, the average size of the site collections it contains must decrease.
Exceeding the 2,000 site collection limit puts you at risk of longer downtimes during upgrades. If you plan to exceed 2,000 site collections, we recommend that you have a clear upgrade strategy, and obtain additional hardware to speed up upgrades and software updates that affect databases.
To set the warning level for the number of sites in a content database, use the Windows PowerShell cmdlet Set-SPContentDatabase with the -WarningSiteCount parameter. For more information, see Set-SPContentDatabase.
Remote BLOB Storage (RBS) storage subsystem on Network Attached Storage (NAS)
Time to first byte of any response from the NAS cannot exceed 20 milliseconds

Boundary
When SharePoint Server 2010 is configured to use RBS, and the BLOBs reside on NAS storage, consider the following boundary.
From the time that SharePoint Server 2010 requests a BLOB, until it receives the first byte from the NAS, no more than 20 milliseconds can pass.
Site collection limits
The following table lists the recommended guidelines for site collections.

Limit
Maximum value
Limit type
Notes
Web site
250,000 per site collection
Supported
The maximum recommended number of sites and subsites is 250,000 sites.
You can create a very large total number of Web sites by nesting subsites. For example, in a shallow hierarchy with 100 sites, each with 1,000 subsites, you would have a total of 100,000 Web sites. Or a deep hierarchy with 100 sites, each with 10 subsite levels would also contain a total of 100,000 Web sites.
Note: Deleting or creating a site or subsite can significantly affect a site’s availability. Access to the site and subsites will be limited while the site is being deleted. Attempting to create many subsites at the same time may also fail.
Site collection size
Maximum size of the content database
Supported
A site collection can be as large as the content database size limit for the applicable usage scenario. For more information about the different content database size limits for specific usage scenarios, see the Content database limits table in this article.
In general, we strongly recommend limiting the size of site collections to 100 GB for the following reasons:
  • Certain site collection actions, such as site collection backup/restore or the Windows PowerShell cmdlet Move-SPSite, cause large Microsoft SQL Server operations which can affect performance or fail if other site collections are active in the same database. For more information, see Move-SPSite.
  • SharePoint site collection backup and restore is only supported for a maximum site collection size of 100 GB. For larger site collections, the entire content database must be backed up. If multiple site collections larger than 100 GB are contained in a single content database, backup and restore operations can take a long time and are at risk of failure.
List and library limits
The following table lists the recommended guidelines for lists and libraries. For more information, see Designing large lists and maximizing list performance (SharePoint Server 2010).

Limit
Maximum value
Limit type
Notes
List row size
8,000 bytes per row
Boundary
Each list or library item can only occupy 8,000 bytes in total in the database. 256 bytes are reserved for built-in columns, which leaves 7,744 bytes for end-user columns. For details on how much space each kind of field consumes, see Column limits.
File size
2 GB
Boundary
The default maximum file size is 50 MB. This can be increased up to 2 GB, however a large volume of very large files can affect farm performance.
Documents
30,000,000 per library
Supported
You can create very large document libraries by nesting folders, or using standard views and site hierarchy. This value may vary depending on how documents and folders are organized, and by the type and size of documents stored.
Major versions
400,000
Supported
If you exceed this limit, basic file operations—such as file open or save, delete, and viewing the version history— may not succeed.
Items
30,000,000 per list
Supported
You can create very large lists using standard views, site hierarchies, and metadata navigation. This value may vary depending on the number of columns in the list and the usage of the list.
Rows size limit
6 table rows internal to the database used for a list or library item
Supported
Specifies the maximum number of table rows internal to the database that can be used for a list or library item. To accommodate wide lists with many columns, each item may be wrapped over several internal table rows, up to six rows by default. This is configurable by farm administrators through the object model only. The object model method is SPWebApplication.MaxListItemRowStorage.
Bulk operations
100 items per bulk operation
Boundary
The user interface allows a maximum of 100 items to be selected for bulk operations.
List view lookup threshold
8 join operations per query
Threshold
Specifies the maximum number of joins allowed per query, such as those based on lookup, person/group, or workflow status columns. If the query uses more than eight joins, the operation is blocked. This does not apply to single item operations. When using the maximal view via the object model (by not specifying any view fields), SharePoint will return up to the first eight lookups.
List view threshold
5,000
Threshold
Specifies the maximum number of list or library items that a database operation, such as a query, can process at the same time outside the daily time window set by the administrator during which queries are unrestricted.
List view threshold for auditors and administrators
20,000
Threshold
Specifies the maximum number of list or library items that a database operation, such as a query, can process at the same time when they are performed by an auditor or administrator with appropriate permissions. This setting works with Allow Object Model Override.
Subsite
2,000 per site view
Threshold
The interface for enumerating subsites of a given Web site does not perform well as the number of subsites surpasses 2,000. Similarly, the All Site Content page and the Tree View Control performance will decrease significantly as the number of subsites grows.
Coauthoring in Microsoft Word and Microsoft PowerPoint for .docx, .pptx and .ppsx files
10 concurrent editors per document
Threshold
Recommended maximum number of concurrent editors is 10. The boundary is 99.
If there are 99 co-authors who have a single document opened for concurrent editing, any user after the 100th user sees a "File in use" error and have to view a read-only copy.
More than 10 co-editors will lead to a gradually degraded user experience with more conflicts and users will have to go through more iterations to get their changes to upload successfully.
Security scope
1,000 per list
Threshold
The maximum number of unique security scopes set for a list should not exceed 1,000.
A scope is the security boundary for a securable object and any of its children that do not have a separate security boundary defined. A scope contains an Access Control List (ACL), but unlike NTFS ACLs, a scope can include security principals that are specific to SharePoint Server. The members of an ACL for a scope can include Windows users, user accounts other than Windows users (such as forms-based accounts), Active Directory groups, or SharePoint groups.
Column limits
SharePoint Server 2010 data is stored in SQL Server tables. To allow for the maximum number of possible columns in a SharePoint list, SharePoint Server will create several rows in the database when data will not fit on a single row. This is called row wrapping.
Each time that a row is wrapped in SQL Server, an additional query load is put on the server when that item is queried because a SQL join must be included in the query. To prevent too much load, by default a maximum of six SQL Server rows are allowed for a SharePoint item. This limit leads to a particular limitation on the number of columns of each type that can be included in a SharePoint list. The following table describes the limits for each column type.
The row wrapping parameter can be increased beyond six, but this may result in too much load on the server. Performance testing is recommended before exceeding this limit. For more information, see Designing large lists and maximizing list performance (SharePoint Server 2010).
Each column type has a size value listed in bytes. The sum of all columns in a SharePoint list cannot exceed 8,000 bytes. Depending on column usage, users can reach the 8,000 byte limitation before reaching the six-row row wrapping limitation.

Limit
Maximum value
Limit type
Size per column
Notes
Single line of text
276
Threshold
28 bytes
SQL Server row wrapping occurs after each 64 columns in a SharePoint list. The default row wrapping value of six allows for a maximum of 384 Single line of text columns per SharePoint list (6 * 64 = 384). However, because the limit per SharePoint list item is 8,000 bytes, of which 256 bytes are reserved for built-in SharePoint columns, the actual limit is 276 Single line of text columns.
Multiple Lines of Text
192
Threshold
28 bytes
SQL Server row wrapping occurs after each 32 columns in a SharePoint list. The default row wrapping value of six allows for a maximum of 192 Multiple lines of text columns per SharePoint list (6 * 32 = 192).
Choice
276
Threshold
28 bytes
SQL Server row wrapping occurs after each 64 columns in a SharePoint list. The default row wrapping value of 6 allows for a maximum of 384 Choice columns per SharePoint list (6 * 64 = 384); ); however because the limit per SharePoint list item is 8,000 bytes, of which 256 bytes are reserved for built-in SharePoint columns, the actual limit should be 276 Choice columns.
Number
72
Threshold
12 bytes
SQL Server row wrapping occurs after each 12 columns in a SharePoint list. The default row wrapping value of six allows for a maximum of 72 Number columns per SharePoint list (6 * 12 = 72).
Currency
72
Threshold
12 bytes
SQL Server row wrapping occurs after each 12 columns in a SharePoint list. The default row wrapping value of six allows for a maximum of 72 Currency columns per SharePoint list (6 * 12 = 72).
Date and Time
48
Threshold
12 bytes
SQL Server row wrapping occurs after each eight columns in a SharePoint list. The default row wrapping value of six allows for a maximum of 48 Date and Time columns per SharePoint list (6 * 8 = 48).
Lookup
96
Threshold
4 bytes
SQL Server row wrapping occurs after each 16 columns in a SharePoint list. The default row wrapping value of six allows for a maximum of 96 single value Lookup columns per SharePoint list (6 * 16 = 96).
Yes / No
96
Threshold
5 bytes
SQL Server row wrapping occurs after each 16 columns in a SharePoint list. The default row wrapping value of six allows for a maximum of 96 Yes / No columns per SharePoint list (6 * 16 = 96).
Person or group
96
Threshold
4 bytes
SQL Server row wrapping occurs after each 16 columns in a SharePoint list. The default row wrapping value of six allows for a maximum of 96 Person or Group columns per SharePoint list (6 * 16 = 96).
Hyperlink or picture
138
Threshold
56 bytes
SQL Server row wrapping occurs after each 32 columns in a SharePoint list. The default row wrapping value of six allows for a maximum of 192 Hyperlink or Picture columns per SharePoint list (6 * 32 = 192) ); however because the limit per SharePoint list item is 8,000 bytes, of which 256 bytes are reserved for built-in SharePoint columns, the actual limit should be 138 Hyperlink or Picture columns.
Calculated
48
Threshold
28 bytes
SQL Server row wrapping occurs after each eight columns in a SharePoint list. The default row wrapping value of six allows for a maximum of 48 Calculated columns per SharePoint list (6 * 8 = 48).
GUID
6
Threshold
20 bytes
SQL Server row wrapping occurs after each column in a SharePoint list. The default row wrapping value of six allows for a maximum of 6 GUID columns per SharePoint list (6 * 1 = 6).
Int
96
Threshold
4 bytes
SQL Server row wrapping occurs after each 16 columns in a SharePoint list. The default row wrapping value of six allows for a maximum of 96 Int columns per SharePoint list (6 * 16 = 96).
Managed metadata
94
Threshold
40 bytes for the first, 32 bytes for each subsequent
The first Managed Metadata field added to a list is allocated four columns:
  • A lookup field for the actual tag
  • A hidden text field for the string value
  • A lookup field for the catch all
  • A lookup field for spillover of the catch all
Each subsequent Managed Metadata field added to a list adds two more columns:
  • A lookup field for the actual tag
  • A hidden text field for the string value
The maximum number of columns of Managed Metadata is calculated as (14 + (16 * (n-1))) where n is the row mapping value (default of 6).
External Data columns have the concept of a primary column and secondary columns. When you add an external data column, you can select some secondary fields of the external content type that you want to be added to the list. For example, given an External Content Type “Customer” which has fields like “ID”, “Name”, “Country”, and “Description”, when you add an External Data column of type “Customer” to a list, you can add secondary fields to show the “ID”, “Name” and “Description” of the Customer. Overall these are the columns that get added:
  • Primary column: A text field.
  • Hidden Id column: A multi-line text field.
  • Secondary columns: Each secondary column is a text/number/Boolean/multi-line text that is based on the data type of the secondary column as defined in the Business Data Catalog model. For example, ID might be mapped to a Number column; Name might be mapped to a Single line of text column; Description might be mapped to a Multiple lines of text column.
Page limits
The following table lists the recommended guidelines for pages.

Limit
Maximum value
Limit type
Notes
Web parts
25 per wiki or Web part page
Threshold
This figure is an estimate based on simple Web Parts. The complexity of the Web parts dictates how many Web Parts can be used on a page before performance is affected.
Security limits

Limit
Maximum value
Limit type
Notes
Number of SharePoint groups a user can belong to
5,000
Supported
This is not a hard limit but it is consistent with Active Directory guidelines. There are several things that affect this number:
  • The size of the user token
  • The groups cache: SharePoint Server 2010 has a table that caches the number of groups a user belongs to as soon as those groups are used in access control lists (ACLs).
  • The security check time: as the number of groups that a user is a member of increases, the time that is required for the access check increases also.
Users in a site collection
2 million per site collection
Supported
You can add millions of people to your Web site by using Microsoft Windows security groups to manage security instead of using individual users.
This limit is based on manageability and ease of navigation in the user interface.
When you have many entries (security groups of users) in the site collection (more than one thousand), you should use Windows PowerShell to manage users instead of the UI. This will provide a better management experience.
Active Directory Principles/Users in a SharePoint group
5,000 per SharePoint group
Supported
SharePoint Server 2010 enables you to add users or Active Directory groups to a SharePoint group.
Having up to 5,000 users (or Active Directory groups or users) in a SharePoint group provides acceptable performance.
The activities most affected by this limit are as follows:
  • Fetching users to validate permissions. This operation takes incrementally longer with growth in number of users in a group.
  • Rendering the membership of the view. This operation will always require time.
SharePoint groups
10,000 per site collection
Supported
Above 10,000 groups, the time to execute operations is increased significantly. This is especially true of adding a user to an existing group, creating a new group, and rendering group views.
Security principal: size of the Security Scope
5,000 per Access Control List (ACL)
Supported
The size of the scope affects the data that is used for a security check calculation. This calculation occurs every time that the scope changes. There is no hard limit, but the bigger the scope, the longer the calculation takes.
Limits by feature
This section lists limits sorted by feature.
Search limits
The following table lists the recommended guidelines for Search.

Limit
Maximum value
Limit type
Notes
SharePoint search service applications
20 per farm
Supported
Multiple SharePoint search service applications can be deployed on the same farm, because you can assign search components and databases to separate servers. The recommended limit of 20 is less than the maximum limit for all service applications in a farm.
Crawl databases and database Items
10 crawl databases per search service application
25 million items per crawl database
Threshold
The crawl database stores the crawl data (time/status, etc.) about all items that have been crawled. The supported limit is 10 crawl databases per SharePoint Search service application.
The recommended limit is 25 million items per crawl database (or a total of four crawl databases per search service application).
Crawl components
16 per search service application
Threshold
The recommended limit per application is 16 total crawl components; with two per crawl database, and two per server, assuming the server has at least eight processors (cores).
The total number of crawl components per server must be less than 128/(total query components) to minimize propagation I/O degradation. Exceeding the recommended limit may not increase crawl performance; in fact, crawl performance may decrease based on available resources on the crawl server, database, and content host.
Index partitions
20 per search service application; 128 total
Threshold
The index partition holds a subset of the search service application index. The recommended limit is 20. Increasing the number of index partitions results in each partition holding a smaller subset of the index, reducing the RAM and disk space that is needed on the query server hosting the query component assigned to the index partition. The boundary for the total number of index partitions is 128.
Indexed items
100 million per search service application; 10 million per index partition
Supported
SharePoint Search supports index partitions, each of which contains a subset of the search index. The recommended maximum is 10 million items in any partition. The overall recommended maximum number of items (e.g., people, list items, documents, Web pages) is 100 million.
Crawl log entries
100 million per search application
Supported
This is the number of individual log entries in the crawl log. It will follow the "Indexed items" limit.
Property databases
10 per search service application;128 total
Threshold
The property database stores the metadata for items in each index partition associated with it. An index partition can only be associated with one property store. The recommended limit is 10 property databases per search service application. The boundary for index partitions is 128.
Query components
128 per search application; 64/(total crawl components) per server
Threshold
The total number of query components is limited by the ability of the crawl components to copy files. The maximum number of query components per server is limited by the ability of the query components to absorb files propagated from crawl components.
Scope rules
100 scope rules per scope; 600 total per search service application
Threshold
Exceeding this limit will reduce crawl freshness, and delay potential results from scoped queries.
Scopes
200 site scopes and 200 shared scopes per search service application
Threshold
Exceeding this limit may reduce crawl efficiency and, if the scopes are added to the display group, affect end-user browser latency. Also, display of the scopes in the search administration interface degrades as the number of scopes passes the recommended limit.
Display groups
25 per site
Threshold
Display groups are used for a grouped display of scopes through the user interface. Exceeding this limit starts degrading the scope experience in the search administration interface.
Alerts
1,000,000 per search application
Supported
This is the tested limit.
Content sources
50 per search service application
Threshold
The recommended limit of 50 can be exceeded up to the boundary of 500 per search service application. However, fewer start addresses should be used, and the concurrent crawl limit must be followed.
Start addresses
100 per content source
Threshold
The recommended limit can be exceeded up to the boundary of 500 per content source. However, the more start addresses you have, the fewer content sources should be used. When you have many start address, we recommend that you put them as links on an html page, and have the HTTP crawler crawl the page, following the links.
Concurrent crawls
20 per search application
Threshold
This is the number of crawls underway at the same time. Exceeding this number may cause the overall crawl rate to decrease.
Crawled properties
500,000 per search application
Supported
These are properties that are discovered during a crawl.
Crawl impact rule
100
Threshold
Recommended limit of 100 per farm. The recommendation can be exceeded; however, display of the site hit rules in the search administration interface is degraded. At approximately 2,000 site hit rules, the Manage Site Hit Rules page becomes unreadable.
Crawl rules
100 per search service application
Threshold
This value can be exceeded; however, display of the crawl rules in the search administration interface is degraded.
Managed properties
100,000 per search service application
Threshold
These are properties used by the search system in queries. Crawled properties are mapped to managed properties.
Mappings
100 per managed property
Threshold
Exceeding this limit may decrease crawl speed and query performance.
URL removals
100 removals per operation
Supported
This is the maximum recommended number of URLs that should be removed from the system in one operation.
Authoritative pages
1 top level and minimal second and third level pages per search service application
Threshold
The recommended limit is one top-level authoritative page, and as few second -and third-level pages as possible to achieve the desired relevance.
The boundary is 200 per relevance level per search application, but adding additional pages may not achieve the desired relevance. Add the key site to the first relevance level. Add more key sites at either second or third relevance levels, one at a time, and evaluate relevance after each addition to ensure that the desired relevance effect is achieved.
Keywords
200 per site collection
Supported
The recommended limit can be exceeded up to the maximum (ASP.NET-imposed) limit of 5,000 per site collection given five Best Bets per keyword. If you exceed this limit, display of keywords on the site administration user interface will degrade. The ASP.NET-imposed limit can be modified by editing the Web.Config and Client.config files (MaxItemsInObjectGraph).
Metadata properties recognized
10,000 per item crawled
Boundary
This is the number of metadata properties that can be determined and potentially mapped or used for queries when an item is crawled.
User Profile Service limits
The following table lists the recommended guidelines for User Profile Service.

Limit
Maximum value
Limit type
Notes
User profiles
2,000,000 per service application
Supported
A user profile service application can support up to 2 million user profiles with full social features functionality. This number represents the number of profiles that can be imported into the people profile store from a directory service, and also the number of profiles a user profile service application can support without leading to performance decreases in social features.
Social tags, notes and ratings
500,000,000 per social database
Supported
Up to 500 million total social tags, notes and ratings are supported in a social database without significant decreases in performance. However, database maintenance operations such as backup and restore may show decreased performance at that point.
Content deployment limits
The following table lists the recommended guidelines for content deployment.

Limit
Maximum value
Limit type
Notes
Content deployment jobs running on different paths
20
Supported
For concurrently running jobs on paths that are connected to site collections in the same source content database, there is an increased risk of deadlocks on the database. For jobs that must run concurrently, we recommend that you move the site collections into different source content databases.
Note:
Concurrent running jobs on the same path are not possible.
If you are using SQL Server snapshots for content deployment, each path creates a snapshot. This increases the I/O requirements for the source database.
For more information, see About deployment paths and jobs.
Blog limits
The following table lists the recommended guidelines for blogs.

Limit
Maximum value
Limit type
Notes
Blog posts
5,000 per site
Supported
The maximum number of blog posts is 5,000 per site.
Comments
1,000 per post
Supported
The maximum number of comments is 1,000 per post.
Business Connectivity Services limits
The following table lists the recommended guidelines for Business Connectivity Services.

Limit
Maximum value
Limit type
Notes
ECT (in-memory)
5,000 per Web server (per tenant)
Boundary
Total number of external content type (ECT) definitions loaded in memory at a given point in time on a Web server.
External system connections
500 per Web server
Boundary
Number of active/open external system connections at a given point in time. The default maximum value is 200; the boundary is 500. This limit is enforced at the Web Server scope, regardless of the kind of external system (for example, database, .NET assembly, and so on) The default maximum is used to restrict the number of connections. An application can specify a larger limit via execution context; the boundary enforces the maximum even for applications that do not respect the default.
Database items returned per request
2,000 per database connector
Threshold
Number of items per request the database connector can return.
The default maximum of 2,000 is used by the database connector to restrict the number of result that can be returned per page. The application can specify a larger limit via execution context; the Absolute Max enforces the maximum even for applications that do not respect the default. The boundary for this limit is 1,000,000.
Workflow limits
The following table lists the recommended guidelines for workflow.

Limit
Maximum value
Limit type
Notes
Workflow postpone threshold
15
Threshold
15 is the maximum number of workflows allowed to be executing against a content database at the same time, excluding instances that are running in the timer service. When this threshold is reached, new requests to activate workflows will be queued to be run by the workflow timer service later. As non-timer execution is completed, new requests will count against this threshold. This is limit can be configured by using the Set-SPFarmConfig Windows PowerShell cmdlet. For more information, see Set-SPFarmConfig.
Note: This limit does not refer to the total number of workflow instances that can be in progress. Instead, it is the number of instances that are being processed. Increasing this limit increases the throughput of starting and completing workflow tasks but also increases load against the content database and system resources.
Workflow timer batch size
100
Threshold
The number of events that each run of the workflow timer job will pick up and deliver to workflows. It is configurable by using Windows PowerShell. To allow for additional events, you can run additional instances of the Microsoft SharePoint Foundation Workflow Timer Service.
Managed Metadata term store (database) limits
The following table lists the recommended guidelines for managed metadata term stores.

Limit
Maximum value
Limit type
Notes
Maximum number of levels of nested terms in a term store
7
Supported
Terms in a term set can be represented hierarchically.  A term set can have up to seven levels of terms (a parent term, and six levels of nesting below it.)
Maximum number of term sets in a term store
1,000
Supported
You can have up to 1,000 term sets in a term store.
Maximum number of terms in a term set
30,000
Supported
30,000 is the maximum number of terms in a term set.
Note:
Additional labels for the same term, such as synonyms and translations, do not count as separate terms.
Total number of items in a term store
1,000,000
Supported
An item is either a term or a term set. The sum of the number of terms and term sets cannot exceed 1,000,000. Additional labels for the same term, such as synonyms and translations, do not count as separate terms.
Note:
You cannot have both the maximum number of term sets and the maximum number of terms simultaneously in a term store.
Visio Services limits
The following table lists the recommended guidelines for instances of Visio Services in Microsoft SharePoint Server 2010.

Limit
Maximum value
Limit type
Notes
File size of Visio Web drawings
50 MB
Threshold
Visio Services has a configuration setting that enables the administrator to change the maximum size of Web drawings that Visio processes.
Larger file sizes have the following side effects:
  • Increase in the memory footprint of Visio Services.
  • Increase in CPU usage.
  • Reduction in application server requests per second.
  • Increase overall latency.
  • Increase SharePoint farm network load
Visio Web drawing recalculation time-out
120 seconds
Threshold
Visio Services has a configuration setting that enables the administrator to change the maximum time that it can spend recalculating a drawing after a data refresh.
A larger recalculation time-out leads to:
  • Reduction in CPU and memory availability.
  • Reduction in application requests per second.
  • Increase in average latency across all documents.
A smaller recalculation time-out leads to:
  • Reduction of the complexity of diagrams that can be displayed.
  • Increase in requests per second.
  • Decrease in average latency across all documents.
Visio Services minimum cache age (data connected diagrams)
Minimum cache age: 0 to 24hrs
Threshold
Minimum cache age applies to data connected diagrams. It determines the earliest point at which the current diagram can be removed from cache.
Setting Min Cache Age to a very low value will reduce throughput and increase latency, because invalidating the cache too often forces Visio to recalculate often and reduces CPU and memory availability.
Visio Services maximum cache age (non-data connected diagrams)
Maximum cache age: 0 to 24hrs
Threshold
Maximum cache age applies to non-data connected diagrams. This value determines how long to keep the current diagram in memory.
Increasing Max Cache Age decreases latency for commonly requested drawings.
However, setting Max Cache Age to a very high value increases latency and slows throughput for items that are not cached, because the items already in cache consume and reduce available memory.
SharePoint Web Analytics service limits
The following table lists the recommended guidelines for the SharePoint Web Analytics service.

Limit
Maximum value
Limit type
Notes
SharePoint entities
30,000 per farm when Web Analytics is enabled
Supported
Do not enable Web Analytics if your farm contains, or is expected to contain, more than 30,000 SharePoint entities, which include all Web applications, site collections, and sites. This number is not exact, because different combinations of SharePoint entities might have a greater or lesser effect on farm performance than the tested scenario, which is described in the article Capacity requirements for the Web Analytics Shared Service in SharePoint Server 2010. However, as the number of SharePoint entities in your farm closely approaches this limit, farm performance might fall to unacceptable levels.
For more information about boundaries and limits for the SharePoint Web Analytics service, see Capacity requirements for the Web Analytics Shared Service in SharePoint Server 2010.
PerformancePoint Services limits
The following table lists the recommended guidelines for PerformancePoint Services in Microsoft SharePoint Server 2010.

Limit
Maximum value
Limit type
Notes
Cells
1,000,000 per query on Excel Services data source
Boundary
A PerformancePoint scorecard that calls an Excel Services data source is subject to a limit of no more than 1,000,000 cells per query.
Columns and rows
15 columns by 60,000 rows
Threshold
The maximum number of columns and rows when rendering any PerformancePoint dashboard object that uses a Microsoft Excel workbook as a data source. The number of rows could change based on the number of columns.
Query on a SharePoint list
15 columns by 5,000 rows
Supported
The maximum number of columns and row when rendering any PerformancePoint dashboard object that uses a SharePoint list as a data source. The number of rows could change based on the number of columns.
Query on a SQL Server data source
15 columns by 20,000 rows
Supported
The maximum number of columns and row when rendering any PerformancePoint dashboard object that uses a SQL Server table data source. The number of rows could change based on the number of columns.
Word Automation Services limits
The following table lists the recommended guidelines for Word Automation Services.

Limit
Maximum value
Limit type
Notes
Input file Size
512 MB
Boundary
Maximum file size that can be processed by Word Automation Services.
Frequency with which to start conversions (minutes)
1 minute (recommended) 
15 minutes (default)
59 minutes (boundary)
Threshold
This setting determines how often the Word Automation Services timer job executes. A lower number leads to the timer job running faster. Our testing shows that it is most useful to run this timer job once per minute.
Number of conversions to start per conversion process
For PDF/XPS output formats: 30 x MFor all other output formats: 72 x M Where M is the value of Frequency with which to start conversions (minutes)
Threshold
The number of conversions to start affects the throughput of Word Automation Services.
If these values are set higher than the recommended levels then some conversion items may start to fail intermittently and user permissions may expire. User permissions expire 24 hours from the time that a conversion job is started.
Conversion job size
100,000 conversion items
Supported
A conversion job includes one or more conversion items, each of which represents a single conversion to be performed on a single input file in SharePoint. When a conversion job is started (using the ConversionJob.Start method), the conversion job and all conversion items are transmitted over to an application server which then stores the job in the Word Automation Services database. A large number of conversion items will increase both the execution time of the Start method and the number of bytes transmitted to the application server.
Total active conversion processes
N-1, where N is the number of cores on each application server
Threshold
An active conversion process can consume a single processing core. Therefore, customers should not run more conversion processes than they have processing cores in their application servers.  The conversion timer job and other SharePoint activities also require occasional use of a processing core.
We recommend that you always leave 1 core free for use by the conversion timer job and SharePoint.
Word Automation Services database size
2 million conversion items 
Supported
Word Automation Services maintains a persistent queue of conversion items in its database. Each conversion request generates one or more records.
Word Automation Services does not delete records from the database automatically, so the database can grow indefinitely without maintenance. Administrators can manually remove conversion job history by using the Windows PowerShell cmdlet Remove-SPWordConversionServiceJobHistory. For more information, see Remove-SPWordConversionServiceJobHistory.
SharePoint Workspace limits
The following table lists the recommended guidelines for Microsoft SharePoint Workspace 2010.

Limit
Maximum value
Limit type
Notes
SharePoint Workspace synchronization
30,000 items per list
Boundary
SharePoint Workspace will not synchronize lists that have more than 30,000 items. This restriction exists because the time to download a list that has more than 30,000 items is very long, and resource usage is high.
SharePoint Workspace synchronization
1800 documents limit in SharePoint Workspace
Boundary
Users are warned when they have more than 500 documents in SharePoint Workspace, but they can continue to add documents.
OneNote limits
The following table lists the recommended guidelines for Microsoft OneNote Services.

Limit
Maximum value
Limit type
Notes
Number of Sections and Section Groups in a OneNote Notebook (on SharePoint)
See limit for "Documents" in List and library limits

Each section counts as one folder and one document in the list. Each section group counts as one folder and one document in the list.
Maximum size of a section
See limit for "File size" in List and library limits

This maximum excludes any images, embedded files, and XPS printouts to OneNote that are larger than 100 KB. Images and embedded files larger than 100 KB are split out into their own binary files. This means that a section with 100 KB of typed data and four embedded Word documents of 1 MB each will be considered a 100 KB section.
Maximum size of an image, embedded file, and XPS OneNote printout in a OneNote section.
See limit for "File size" in List and library limits

Each item is stored as a separate binary file and is therefore subject to file size limits. Each print operation to OneNote will result in one XPS printout binary, even if the printout contains multiple pages.
Maximum size of all images, embedded files, and XPS printouts in a single OneNote page.
Default limit is double the "File size" limit.
Threshold
This applies to embedded content in a single OneNote page, not a Section or Notebook. If users encounter this, they will see the following error in OneNote: jerrcStorageUrl_HotTableFull (0xE0000794). Users can work around this by splitting embedded content into different pages and deleting previous versions of the page. If users have to adjust this value (“Max Hot Table Size”), the effective limit is half of the absolute value they define (for example, specifying a 400 MB max hot table size means that the maximum size of all embedded content on a page is limited to 200 MB).
Merge operations
One per CPU core per Web server
Boundary
OneNote merges combine changes from multiple users who are co-authoring a notebook. If no CPU core is available to run a merge, a conflict page is generated instead, which forces the user perform the merge manually).
This limit applies whether OneNote is running as a client application or as a Microsoft Office Web Apps.
Office Web Application Service limits
The following table lists the recommended guidelines for Office Web Apps. Office client application limits also apply when an application is running as a Web app.

Limit
Maximum value
Limit type
Notes
Cache size
100 GB
Threshold
Space available to render documents, created as part of a content database. By default, the cache available to render documents is 100 GB. We do not recommend that you increase the available cache.
Renders
One per document per second per CPU core per application server (maximum eight cores)
Boundary
This is the measured average number of renders that can be performed of "typical" documents on the application server over a period of time.
Project Server limits
The following table lists the recommended guidelines for Microsoft Project Server. For more information about how to plan for Project Server, see Planning and architecture for Project Server 2010.

Limit
Maximum value
Limit type
Notes
End of project time
Date: 12/31/2049
Boundary
Project plans cannot extend past the date 12/31/2049.
Deliverables per project plan
1,500 deliverables
Boundary
Project plans cannot contain more than 1,500 deliverables.
Number of fields in a view
256
Boundary
A user cannot have more than 256 fields added to a view that they have defined in Project Web App.
Number of clauses in a filter for a view
50
Boundary
A user cannot add a filter to a view that has more than 50 clauses in it.