Altering a table space

Use this notebook to modify a table space at the current server. The current table space name appears in the Table space name field on the Table Space page. Many of the options are presented here for information only.

Authorities and privileges

To alter a table space:

  1. Open the Alter Table Space window.

  2. Specify the optional properties for this table space.

  3. Specify the appropriate information to manage this table space . This information describes the data set and space management.

  4. If you selected to alter a partitioned table space, select the Partition Management tab to modify the optional properties of each partition.

Related information

Specifying properties

Use this page of the notebook to modify the properties of the space.
  1. Optional: Specify a different buffer pool name. The name must identify an active buffer pool.

  2. Optional: Change the lock size to be used within this table space.

  3. Optional: Change the maximum number of page or row locks that an application process can hold simultaneously in the table space.

  4. Optional: Enter the maximum number of rows that DB2 will consider placing on each data page (MAXROWS). You can enter a value from 1 to 255, or accept the default of 255.

  5. Optional: Select whether to change a maximum size for each partition or dataset (DSSIZE). This is only applicable for LOB table spaces.

  6. Optional: Select whether to use the default CLOSE rule.

  7. Optional: This is applicable only for LOB table spaces. Select the check box to record changes to a column in a LOB table space to the log. You cannot use this if the auxiliary table in the table space stored a LOB column that is greater than 1 gigabyte. For LOB table spaces, recording column changes to the log is the default.

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Managing your space

Use this page of the notebook to define the details of the space.
  1. Optional: Select whether the data set for the table space is managed by the user (VCAT). Then select a catalog name.

  2. Optional: If data sets are not to be managed by the user, then select Managed by DB2. You can then enter the storage group name.

  3. Optional: If you selected to have data sets managed by DB2, you should enter the minimum primary space allocation (PRIQTY). This field is not applicable if you selected data set management by USER.

  4. Optional: If you selected to have data sets managed by DB2, you should enter the minimum secondary space allocation (SECQTY). This field is not applicable if you selected data set management by USER.

  5. Optional: If you selected to have data sets managed by DB2, you should select an ERASE option. This field is not applicable if you selected data set management by USER.

  6. Optional: Select to choose to manage the free space (FREEPAGE and PCTFREE) amount.

  7. The cached pages options are for group buffer pools only. This specifies what table spaces are written to the group buffer pool in a data sharing environment.

  8. Select whether to compress data in the rows or not.

  9. Optional: Select the check box to decide whether DB2 tracks modified pages in the space map pages of the table space or partition. If you choose to let DB2 track changes, you could see some improvement in the performance of incremental image copies. If you clear the check box, DB2 uses the LRSN value in each page to determine whether a page has been changed. This should not be used for a LOB table space.

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Managing your partitions (for partitioned table spaces only)

This page of the notebook gives you a table of information about each partition you define in the table space.
  1. Select ADD to define the properties of a partition. The Add Partition Management window opens.

  2. Select CHANGE to modify the properties of a partition you have selected from the table. Change Partition Management

  3. Select REMOVE to delete a partition from the table space.

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