|
SQL Server Database Engine object
|
Maximum sizes/numbers SQL Server (32-bit) |
Maximum sizes/numbers SQL Server (64-bit) |
| 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 |
Subscribe