Batch size1

65,536 * Network Packet Size

65,536 * Network Packet Size

Bytes per short string column

8,000

8,000

Bytes per GROUP BY, ORDER BY

8,060

8,060

Bytes per index key2

900

900

Bytes per foreign key

900

900

Bytes per primary key

900

900

Bytes per row8

8,060

8,060

Bytes in source text of a stored procedure

Lesser of batch size or 250 MB

Lesser of batch size or 250 MB

Bytes per varchar(max), varbinary(max), xml, text, or image column

2^31-1

2^31-1

Characters per ntext or nvarchar(max) column

2^30-1

2^30-1

Clustered indexes per table

1

1

Columns in GROUP BY, ORDER BY

Limited only by number of bytes

Limited only by number of bytes

Columns or expressions in a GROUP BY WITH CUBE or WITH ROLLUP statement

10

10

Columns per index key7

16

16

Columns per foreign key

16

16

Columns per primary key

16

16

Columns per nonwide table

1,024

1,024

Columns per wide table

30,000

30,000

Columns per SELECT statement

4,096

4,096

Columns per INSERT statement

4096

4096

Connections per client

Maximum value of configured connections

Maximum value of configured connections

Database size

524,272 terabytes

524,272 terabytes

Databases per instance of SQL Server

32,767

32,767

Filegroups per database

32,767

32,767

Files per database

32,767

32,767

File size (data)

16 terabytes

16 terabytes

File size (log)

2 terabytes

2 terabytes

Foreign key table references per table4

253

253

Identifier length (in characters)

128

128

Instances per computer

50 instances on a stand-alone server for all SQL Server editions except for Workgroup. Workgroup supports a maximum of 16 instances per computer.

SQL Server supports 25 instances on a failover cluster.

50 instances on a stand-alone server.

25 instances on a failover cluster.

Length of a string containing SQL statements (batch size)1

65,536 * Network packet size

65,536 * Network packet size

Locks per connection

Maximum locks per server

Maximum locks per server

Locks per instance of SQL Server5

Up to 2,147,483,647

Limited only by memory

Nested stored procedure levels6

32

32

Nested subqueries

32

32

Nested trigger levels

32

32

Nonclustered indexes per table

999

999

Number of distinct expressions in the GROUP BY clause when any of the following are present: CUBE, ROLLUP, GROUPING SETS, WITH CUBE, WITH ROLLUP

32

32

Number of grouping sets generated by operators in the GROUP BY clause

4,096

4,096

Parameters per stored procedure

2,100

2,100

Parameters per user-defined function

2,100

2,100

REFERENCES per table

253

253

Rows per table

Limited by available storage

Limited by available storage

Tables per database3

Limited by number of objects in a database

Limited by number of objects in a database

Partitions per partitioned table or index

1,000

1,000

Statistics on non-indexed columns

30,000

30,000

Tables per SELECT statement

Limited only by available resources

Limited only by available resources

Triggers per table3

Limited by number of objects in a database

Limited by number of objects in a database

Columns per UPDATE statement (Wide Tables)

4096

4096

User connections

32,767

32,767

XML indexes

249

249