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Suggestion needed for IQ upgrade 16 from 15.4

Planning to upgrade IQ 15.4 to IQ 16 .. Database size : 15 TB

Wanted to check . Is it mandatory rebuild index for wide columns .. ( Not sure how long rebuild will take ) ..

For rebuilding index for all wide columns in database . Can I run below command instead of running for individual table/column .

sp_iqrebuildindexwide [ table_name ] [, table_owner] [, level]

sp_iqrebuildindexwide NULL,NULL,1

So if I pass table_name and table_ower as NULL . Will it rebuild index for whole database for wide column .

Appreciate your suggestion .


Ajay Pandey

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    Posted on Jul 28, 2016 at 07:34 PM

    The rebuild is recommended for all columns so that we can put them in the newer, faster format. Also, for character fields we also capture more stats about the data in IQ 16. If you don't rebuild we will lose those stats and consequently not give the optimizer more information to feed better/faster results.

    I will say that they don't all have to be done at once. You can trickle in the changes over time by running the commands during off hours or low use times. If I were to prioritize, I would start with your most active, largest tables so that we can realize the space savings of the new index structures and boost performance.


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    • That's not quite true. IQ can operate on the older structures without issue. It is strongly recommended to convert as there are many performance and stability improvements. To say it is required is a bit of a stretch.

      The issues are that they are older, slower structures that take up more space. Also, the FP3 is known to have issues. If you don't rebuild them, you may have a latent issue until you access it or change the data via the application. Better to know about it before running in production.


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