Thursday, July 30, 2009

SQL Server maximum values

SQL Server 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
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

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