A few maximum limitations for Sqlserver and MySql

jvanamali — Sat, 10 Jan 2009 04:50:46 +0000

Often people in newsgroups ask about maximum size of various objects defined in databases.

The following tables shows the maximum sizes and numbers of various objects defined in MYSql, SQL Server.

MySql Maximums
Char	255 Bytes
Varchar	65,535 Bytes
Binary	255 Bytes
Varbinary	65,535 Bytes
TinyBlob	255 Bytes
TinyText	255 Bytes
Blob	65,535 Bytes (2^16 -1)
Text	65,535 Bytes (2^16 -1)
Medium Blob	16,777,215 Bytes (2^24 -1)
Medium Text	16,777,215 Bytes (2^24 -1)
LongBlog	4,294,967,295 Bytes (2^32 -1)
LongText	4,294,967,295 Bytes (2^32 -1)
Bit	Range from 1 to 64
Tinyint	The signed range is -128 to 127. The unsigned range is 0 to 255.
BOOL, BOOLEAN	true or false
SmallInt	The signed range is -32768 to 32767. The unsigned range is 0 to 65535.
MediumInt	The signed range is -8388608 to 8388607. The unsigned range is 0 to 16777215.
Int/Integer	The signed range is -2147483648 to 2147483647. The unsigned range is 0 to 4294967295.
BigInt	The signed range is -9223372036854775808 to 9223372036854775807. The unsigned range is 0 to 18446744073709551615.
Float	Allowable values are -3.402823466E+38 to -1.175494351E-38, 0, and 1.175494351E-38 to 3.402823466E+38.
Double	Allowable values are -1.7976931348623157E+308 to -2.2250738585072014E-308, 0, and 2.2250738585072014E-308 to 1.7976931348623157E+308.

Sqlserver Maximums
char	8,000 Char
nchar	4,000 char
varchar	8,000 char
nvarchar	8,000 char
varchar(max)	1,073,741,824 char
nvarchar(max)	536,870,912 char
Tinyint	The range is 0 to 255.
SmallInt	The signed range is -32768 to 32767.
BigInt	The signed range is -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807.
Int	The signed range is -2,147,483,648 to 2,147,483,647.
money	The signed range is -922,337,203,685,477.5808 to 922,337,203,685,477.5807.
smallmoney	Allowable values are -214,748.3648 to 214,748.3647.
bit	single bit.
binary	8,000 bytes.
varbinary	8,000 bytes.
varbinary(max)	2 GB Data.
image	2 GB Data.

Other Helpful Sql Maximums
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

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A few maximum limitations for Sqlserver and MySql