Index Coalesced - how to check this information?

Hi all

Can you please help me with this info:

I'm Coalescing index in a pattern in our database. I know this merges leaves blocks and removes fragmentation but only recover space as in the case of Index rebuild.

I want to know if there is a way to check / confirm that a particular Index is merged successfully? I don't see any change OF VALUES IN - LEAF_BLOCKS, AVG_LEAF_BLOCKS_PER_KEY, CLUSTERING_FACTOR, SAMPLE_SIZE, dba_indexes LAST_ANALYZED. I think he must have seen there some dictionary that fills this kind of information. Please share your ideas / knowledge.

Thank you very much
Kerim

Kerim says:
Hello

This info is helpful. I have not run a standard process to determine which indexes need to merge. We had an important activity DML / deletes in the scheme of the last week. So, rather than rebuild the indexes, we thought merge would be an option to try.

And what do you hope to achieve by index coalescing/rebuild? Are you facing performance issues? Have you seen that the performance problem is "solved" by coalescing/rebuilding of the index?

I see that you have demonstrated by example (analyze index validate structure) and then run merge and show how the stats changed in the INDEX_STATS table. This means running (analyze index validate structure) is a mandatory thing to do if we want to merge the indexes or is it just to see the details in the INDEX_STATS? Please confirm

N ° you have to run INDEX ANALYSER... VALIDATE THE STRUCTURE. It is done only to see details in INDEX_STATS here.
Your original question was where you can see the effect of the operation coalesce. So I showed you a place where you can see how coalesce affect the index.
I hope this helps.

Tags: Database

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