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Index Rebuild VS analyze index-compute statics VS DBMS_STATS.GATHER_INDEX_S
user4295847
Member Posts: 102 Blue Ribbon
Hi ,
I have little doubt on below listed topics. Please explain me each topics and when we need to use for same. Can I use these all at a time ? WHat are advantages and disadvantages forthese topics ?
1) Index Rebuild and index rebuild online
2) analyze index-compute statics and validate strcture
3) DBMS_STATS.GATHER_INDEX_STATS
I have little doubt on below listed topics. Please explain me each topics and when we need to use for same. Can I use these all at a time ? WHat are advantages and disadvantages forthese topics ?
1) Index Rebuild and index rebuild online
2) analyze index-compute statics and validate strcture
3) DBMS_STATS.GATHER_INDEX_STATS
Tagged:
Best Answer
-
In order to make good use of the cost based optimizer, you need to create statistics for the data in the database.
Answers
-
Hi,
1) unless index is in an invalid or unusable state, it is very unlikely that it would ever need a rebuild
http://richardfoote.files.wordpress.com/2007/12/index-internals-rebuilding-the-truth.pdf
2) ANALYZE is obsolete, don't use it anymore
3) DBMS_STATS is the way to go (you don't necessarily have to call GATHER_INDEX_STATS explicitly, you can also use CASCADE=>true option in GATHER_TABLE_STATS)
Best regards,
Nikolay -
Thank for your reply.
Please explain me Index Rebuild ONLINE
and what is the functionality for the DBMS_STATS.GATHER_INDEX and when we need to use ? -
Why are you asking to rephrase what is already explained in the online documentation?
-----------
Sybrand Bakker
Senior Oracle DBA -
Please explain me Index Rebuild ONLINE
Jonathan sir have written good article on this have a look.
http://jonathanlewis.wordpress.com/2009/06/05/online-rebuild/ -
Hiuser4295847 wrote:
Thank for your reply.Please explain me Index Rebuild ONLINEWhy don't we go another way: you spend a few days working through the links and online documentation, and then if you have any questions left, you ask them here.
and what is the functionality for the DBMS_STATS.GATHER_INDEX and when we need to use ?
Best regards,
Nikolay -
Yes Understand the index rebuild oniline from your link..
Please explain more about DBMS_STATS.GATHER_INDEX_STATS and when we can use ? -
check:
http://docs.oracle.com/cd/B28359_01/appdev.111/b28419/d_stats.htm#i1036276 -
Hi ,
I am able to understand the DBMS_STATS from this link.
Could you please give me 2 lines answers for what are the advantages if we use DBMS_STATS -
In order to make good use of the cost based optimizer, you need to create statistics for the data in the database.
-
Thanks Fran..
This discussion has been closed.