Every now and then i see a question pop up that asks what is the max this or that in sql server?
Well here are some maximum values:
Bytes per short string column | 8,000 |
Bytes per GROUP BY, ORDER BY | 8,060 |
Columns in GROUP BY, ORDER BY | Limited only by number of bytes |
Bytes per index key | 900 |
Bytes per foreign key | 900 |
Bytes per primary key | 900 |
Bytes per row | 8,060 |
Bytes per varchar(max), varbinary(max), xml, text, or image column | 2^31-1 |
Characters per ntext or nvarchar(max) column | 2^30-1 |
Clustered indexes per table | 1 |
Columns per index key | 16 |
Columns per foreign key | 16 |
Columns per primary key | 16 |
Columns per base table | 1,024 |
Columns per SELECT statement | 4,096 |
Columns per INSERT statement | 1,024 |
Connections per client | 32,767 |
Database size | 1,048,516 terabytes |
Databases per instance of SQL Server | 32,767 |
Filegroups per database | 32,767 |
Files per database | 32,767 |
File size (data) | 16 terabytes |
File size (log) | 2 terabytes |
Foreign key table references per table | 253 |
Identifier length (in characters) | 128 |
Instances per computer | 50 (Workgroup Edition only 16) |
Locks per connection | Maximum locks per server |
Locks per instance of SQL Server | Up to 2,147,483,647 |
Nested stored procedure levels | 32 |
Nested subqueries | 32 |
Nested trigger levels | 32 |
Nonclustered indexes per table | 249 |
Parameters per stored procedure | 2,100 |
Parameters per user-defined function | 2,100 |
REFERENCES per table | 253 |
Rows per table | Limited by available storage |
Tables per database | Limited by number of objects in a database |
Partitions per partitioned table or index | 1,000 |
Statistics on non-indexed columns | 2,000 |
Tables per SELECT statement | 256 |
Triggers per table | Limited by number of objects in a database |
UNIQUE indexes or constraints per table | 249 nonclustered and 1 clustered |
User connections | 32,767 |
XML indexes | 249 |
