What is REORG? When is it used?

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What is REORG? When is it used?..

What vamshi is said is incorrect .i.e he told about
RUNSTATS utility.

Where in REORG is used to re organise the table after huge
manipulation say insert,delete of records etc.It provides
free space also.

Correct me if i wrong vamshi/anyone

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What is REORG? When is it used?..

Answer / mehdee

REORG INDEX
The online REORG INDEX utility reorganizes an index space
to improve access performance and reclaim fragmented space.
You can specify the degree of access to your data during
reorganization, and you can collect inline statistics by
using the STATISTICS keyword.

REORG TABLESPACE
The online REORG TABLESPACE utility reorganizes a table
space to improve access performance and to reclaim
fragmented space. In addition, the utility can reorganize a
single partition or range of partitions of a partitioned
table space.
Traditionally, tablespace reorg consists of the following
steps:
• unload of the data
• redefinition of the tablespace
• reload of the data
• rebuild of the indexes

Now that we know what it dose, it is a DBA person to run
it as required.

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What is REORG? When is it used?..

Answer / thiru

Yes What Vamsi said is right. But not only it will re-
organise or re arrange the occupied and un occupied space
of the perticular table. By default when we add a new
column to the existing table db2 V9 onwards the REORG is
compulsary. otherwise from any application the table will
not be accessed.
while doing the REORG after New column addition or Bulk
Insert/Load it will rearrange the data internally based on
the indexes available from the table. hence further search
as well as other operations will be faster.

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What is REORG? When is it used?..

Answer / vamsikrishnamraju

Calculates statistics on the database to determine if
tables or indexes, or both, need to be reorganized or
cleaned up.

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5 No

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