Skip to Content
author's profile photo Former Member
Former Member

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 .

Thanks

Ajay Pandey

Add a comment
10|10000 characters needed characters exceeded

Assigned Tags

Related questions

1 Answer

  • Best Answer
    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.

    Mark

    Add a comment
    10|10000 characters needed characters exceeded

    • 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.

      Mark

Before answering

You should only submit an answer when you are proposing a solution to the poster's problem. If you want the poster to clarify the question or provide more information, please leave a comment instead, requesting additional details. When answering, please include specifics, such as step-by-step instructions, context for the solution, and links to useful resources. Also, please make sure that you answer complies with our Rules of Engagement.
You must be Logged in to submit an answer.

Up to 10 attachments (including images) can be used with a maximum of 1.0 MB each and 10.5 MB total.