Reg. paralle and degree

Hi,
what is parallel and degree in oracle?
how to find the no. of cpu's attahed?
can we use parallel while rebulding the indexes?
Please answer to these questions?
Thanks in advance

user583972 wrote:
what is the difference between degree and parallel?There is no difference as such between parallel and degree. The old syntax for specifying the parallelism was PARALLEL (DEGREE n INSTANCES m), but the new syntax is basically PARALLEL or PARALLEL n.
There are two attributes that relate to the parallel execution: The degree and the number of instances the statement should be executed in a Parallel Server/RAC environment.
The parallel "degree" determines how many parallel threads or slaves are supposed to be used for parallel statement execution per database instance. So if you say parallel 2 (or in the old syntax parallel (degree 2)) then two parallel slaves will be used for execution. Note that in case sorting or grouping is used as part of the statement, or parallel DML is used, then you might end up with a second set of parallel slaves, which means you can effectively have 4 parallel slaves with a degree of 2.
The number of "instances" determine on how many nodes of a RAC/Parallel Server the parallel slaves should be spread, each using "degree" number of slaves.
How to find how many cpu's in this case?If you just say PARALLEL without any degree then you get the default PARALLEL degree, which is determined by the parameters PARALLEL_THREADS_PER_CPU (default usually = 2) and CPU_COUNT (which shows how many CPUs Oracle has detected on startup).
If you have set PARALLEL_ADAPTIVE_MULTI_USER to FALSE, then the default parallel degree will be PARALLEL_THREADS_PER_CPU * CPU_COUNT. So if Oracle detects 16 CPUs and you have default for PARALLEL_THREADS_PER_CPU, then you get a default DOP (Degree Of Parallelism) of 32, which could mean up to 64 parallel slaves if sorting/grouping is included.
Setting PARALLEL_ADAPTIVE_MULTI_USER to TRUE means that the default DOP will be reduced if multiple parallel executions are requested simultaneously.
Note that there are other constraints like the PROCESSES or PARALLEL_MAX_SERVERS parameters that might limit the maximum number of parallel slaves that can be used.
For further details, read e.g. the documentation:
http://download.oracle.com/docs/cd/B28359_01/server.111/b28313/usingpe.htm#i1007254
Regards,
Randolf
Oracle related stuff blog:
http://oracle-randolf.blogspot.com/
SQLTools++ for Oracle (Open source Oracle GUI for Windows):
http://www.sqltools-plusplus.org:7676/
http://sourceforge.net/projects/sqlt-pp/

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With Regards
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Hi,
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<Link deleted by moderator>
Hope this will help you
BR
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Edited by: Virendra Pal on Mar 3, 2011 12:34 PM
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