Wednesday, January 14, 2009

parallelism in Oracle?

Complete about Oracle Parallelism?

Solution:

Following initialization parameters are required for parallelism setup in database.

PARALLEL_SERVER,
PARALLEL_SERVER_INSTANCES,
PARALLEL_MIN_SERVERS,
PARALLEL_MAX_SERVERS?
PARALLEL_THREADS_PER_CPU

Parallel Queries and Parallel jobs execution

1. Select query with parallelism example:

Select /*+ parallel (a,32) */ * from dba_segments a;

32 is degreee here(Numbers of parallel processes)

Gather statistics of a table using parallelism Example

exec FND_STATS.GATHER_TABLE_STATS (ownname => '&owner', tabname => '&table_name', percent => 20 ,degree => 30 , granularity => 'ALL', cascade => TRUE);

Comple objects in the database with parallelism Example

exec sys.utl_recomp.recomp_parallel(32);

Table used to know number of parallel processes running are

v$px_session - Standard
gv$px_session - For RAC

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