virginiakerop.blogg.se - Table partitioning in sql server 2012 enterprise edition

#TABLE PARTITIONING IN SQL SERVER 2012 ENTERPRISE EDITION UPDATE#
#TABLE PARTITIONING IN SQL SERVER 2012 ENTERPRISE EDITION ARCHIVE#

It doesn’t move any data around, so to actually move the data from the filegroup where it lived to the old, slow disk archival filegroup, you need to move the data, but you move it when the partition isn’t attached to the existing partitioned table. The switch operation is so fast because all it does is change metadata. There is a bit of a catch to this part: With archiving, you often want to move the old data to slower or different storage.

#TABLE PARTITIONING IN SQL SERVER 2012 ENTERPRISE EDITION ARCHIVE#

When your data is aligned, deleting or archiving data is as simple as switching a table out of the current partition, after which you can unload or archive it at your leisure. If your data is partitioned on boundaries that are also the natural boundaries on which you add or remove data, the data is considered to be aligned.

Faster and easier data deletion or archival: For the same reasons, partitioned tables also help you to delete or archive data.

This switch is a simple metadata change that quickly executes, which is why partitioned tables are a great way to load large amounts of data with limited impact to users who touch the rest of the data in the table. After the data is loaded to the new table, you can perform a switch to add the new table to the live data. Clearly, there will be an impact on the I/O subsystem, but if you also have separate filegroups on different physical disks, even this has a minimal impact on overall system performance. A partitioned table enables you to load the data to an empty table that’s not in use by the “live” data, so it has less impact on concurrent live operations. “A large amount of data,” doesn’t mean a specific amount of data, but any case in which the load operation takes longer than is acceptable in the production cycle.

Faster and easier data loading: If your database has a large amount of data to load, you might want to consider using a partitioned table.

Following are several reasons for doing this: The following table specifies the maximum sizes and number of various objects defined in SQL Server Replication.SQL Server partitioned tables are a way to spread a single table over multiple partitions, and while doing so each partition can be on a separate filegroup. Limited by the number of objects in a database, or available memory. Maximum Sizes / Numbers SQL Server (32-bit) The following table specifies the maximum sizes and number of various objects that were tested in the SQL Server data-tier applications (DAC). Total number of user databases per SQL Server Utility User databases per instance of SQL Server, including data-tier applications Total number of instances of SQL Server per SQL Server Utility Maximum Sizes / Numbers SQL Server (32-bit)Ĭomputers (physical computers or virtual machines) per SQL Server Utility

The following table specifies the maximum sizes and number of various objects that were tested in the SQL Server Utility.

#TABLE PARTITIONING IN SQL SERVER 2012 ENTERPRISE EDITION UPDATE#

Limited by number of objects in a database.Ĭolumns per UPDATE statement (Wide Tables) Partitions per partitioned table or index Limited by number of objects in a database Number of grouping sets generated by operators in the GROUP BY clause Number of distinct expressions in the GROUP BY clause when any of the following are present: CUBE, ROLLUP, GROUPING SETS, WITH CUBE, WITH ROLLUP Length of a string containing SQL statements (batch size) Maximum Sizes / Numbers SQL Server (32-bit)īytes in source text of a stored procedure.īytes per VARCHAR(MAX), VARBINARY(MAX), XML, TEXT, or IMAGE columnĬharacters per NTEXT or NVARCHAR(MAX) columnĬolumns or expressions in a GROUP BY WITH CUBE or WITH ROLLUP statementĥ0 instances on a stand-alone server for all SQL Server editions. The following table specifies the maximum sizes and number of various objects defined in SQL Server databases or referenced in Transact-SQL statements.

The following tables specify the maximum sizes and numbers of various objects defined in SQL Server 2012 components, and compared against the maximum sizes and number of various objects defined in SQL Server 2008 and SQL Server 2008 R2 components. SQL Server 2012 Maximum Capacity Specifications (32-bit Server) Home > SQL Server 2012 > SQL Server 2012 Maximum Capacity Specifications (32-bit Server)