Db2 Shrink Tablespace 2021 | wondervalley.travel
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When you reduce the size of an automatic storage table space, the database manager attempts to lower the high water mark for the table space and reduce the size of the table space containers. In attempting to lower the high water mark, the database manager might drop empty containers and might move used extents to free space nearer the. You can reclaim unused storage in a DMS table space by telling the database manager to consolidate in-use extents lower in the table space. This also has the effect of lowering the high water mark. To reduce the container sizes in a DMS table space requires a separate REDUCE operation must.

A DB2 database will update the prefetch size automatically whenever the number of containers in a table space changes following successful execution of an ALTER TABLESPACE statement that adds or drops one or more containers. The prefetch size is also automatically updated at database startup. After deleting a big set of data from a table, we expect it to get smaller than it was before. But in Db2 V9.5 you need to lower high water mark to shrink unused space in tablespace. After Db2 V9.7 you can use ALTER TABLESPACE command to lower high water mark and reduce a table’s size. There was some unexpected growth on a DB2 database server during the business day. Various jobs begin to fail due to disk issues. There was an immediate requirement to release space to back to OS. Sometimes unexpected growth occurs, regardless of scheduled reorganizations and capacity planning. The ALTER TABLESPACE REDUCE is useful in these.

Shrink a tablespace with DB2 9.5 is much more difficult. The reduce and resize command exist but will only work if the high water mark is low. You cannot use reduce or resize below the HWM size. You need to use DB2DART -LHWM and have the database deactivated while doing so. 1 If you specify DROP PENDING CHANGES, DSSIZE, or SEGSIZE, no other clauses can be specified in the same ALTER TABLESPACE statement. 2 The same clause must not be specified more than one time in a single ALTER TABLESPACE statement. 3 The same clause must not be specified more than one time for each altered partition. 1. In DB2, there is a variable "DB2_OPT_MAX_TEMP_SIZE", which limits the amount of space that queries can use in the temporary tablespaces. Setting DB2_OPT_MAX_TEMP_SIZE can cause the optimizer to choose a plan that is more expensive than would otherwise be chosen, but which uses less space in the temporary table spaces.

The MON_GET_TABLESPACE table function returns one row of data per database table space and per database member. No aggregation across database members is performed. However, aggregation can be achieved through SQL queries. Metrics collected by this function are controlled at the database level using the mon_obj_metrics configuration parameter. 08.11.2005 · Hi I have a very heavy table in a datafile, I drop table but datafile don’t release extra disk space. Please advise how to Shrink tablespace/ datafile.

How to Shrink automatic storage tablespaces on DB2 V9.5 Now, in the DB2 v9.5 you can shrink a table space, in the DB2 9.1 it was not possible To reduce the tablespace utilization, you.

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