Maximum Capacity Limits

SQL Server 2005 Database Engine Object Maximum Values
Batch size 65,536 × Network Packet Size
Bytes per short string column 8,000
Bytes per GROUP BY, ORDER BY 8,060
Bytes per index key 900
Bytes per foreign key 900
Bytes per primary key 900
Bytes per row 8,060
Bytes in source text of a stored procedure The lesser of batch size or 250 MB
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 in GROUP BY, ORDER BY Limited only by number of bytes (see Bytes per GROUP BY, ORDER BY)
Columns or expressions in a GROUP BY WITH CUBE or WITH ROLLUP statement 10
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 Maximum value of configured connections
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 file) 16 terabytes
File size (log file) 2 terabytes
Foreign key table references per table 253
Identifier length (in characters) 128
Instances per computer 16 (50 for Enterprise Edition)
Length of a string containing SQL statements (Batch size) 65,536 × network packet size
Locks per connection Maximum locks per instance of SQL Server
Locks per instance of SQL Server IA-32: up to 2,147,483,647 IA-64, ×64: limited only by memory
Nested stored procedure levels 32
Nested subqueries 32
Nested trigger levels 32
Non clustered 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 only by available storage
Tables per database Limited by number of objects in a database
Partitions per partitioned table or index 1,000
Statistics on nonindexed columns 2,000
Tables per SELECT statement 256
Triggers per table Limited by number of objects in a
UNIQUE indexes or constraints per table 1 clustered and 249 nonclustered indexes
XML indexes 249

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