SQL Server - Introdução

Bom,
muita gente conhece e ou já ouviu falar de banco de dados.

SQL Server é um banco de dados também , aliás é um SGBD ( Sistema Gerenciador de Banco de Dados)
que é mais interessante e complexo do que um simples banco de dados.

Mas o interessante mesmo é sua capacidade máxima:

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 ornvarchar(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. SQL Server supports 25 instances on a failover cluster when using a shared cluster disk as the stored option for you cluster installation SQL Server supports 50 instances on a failover cluster if you choose SMB file shares as the storage option for your cluster installation For more information, seeStorage Types for Data Files.	50 instances on a stand-alone server. 25 instances on a failover cluster when using a shared cluster disk as the stored option for you cluster installation SQL Server supports 50 instances on a failover cluster if you choose SMB file shares as the storage option for your cluster installation For more information, see Storage Types for Data Files.
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  Important Creating a table or index with more than 1,000 partitions is possible on a 32-bit system, but is not supported.	15,000
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

Fonte: http://technet.microsoft.com/pt-br/library/ms143432.aspx

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