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Status Not under consideration
Workspace Informix
Components Informix Server
Created by Guest
Created on Dec 9, 2022

RELATED IDEAS

Fixing IPA in a 15TB OLTP database or large database

We have a 15 TB size oltp db running in 12.10.FC12.

We want to fix the data with pending IPA,however, we cannot use the traditional way due to :

- we cannot put the DB offline for hours to fix the data with pending IPA and it will be between  5 to 10 millions of revenue loss (24 to 48 hours)  for the company if we shutdown the DB to fix the data with pending IPA.

What we have done so far in relation to data with Pending IPA.
- We cannot use the traditional way via update table set col1=col1 where 1=1, this will take years to complete billions of record. We have tried this approach and did not work in our prod system.
- We cannot use EXECUTE FUNCTION task('table update_ipa parallel','tablename'), this will lock the table and cannot be done online due to blocking of live transactions.
 

 

Needed By Quarter
  • Guest
    Reply
    |     Jan 5, 2023

    Oops. Looks like my login failed. The previous comment was me: Art Kagel. Contact me for a copy of fix_ips4.ec

  • Guest
    Reply
    |     Jan 5, 2023

    You can use my fix_ipa4.ec tool. Reach out to me privately and I will send you the source.

    It tends to be faster than the API function, only locks a relatively small number of rows at a time, and only updates pages that are not already at the latest version level, so it can be cancelled at any time and restarted with no penalty.


    $ fix_ipa -?

    fix_ipa - Complete outstanding in-place alters for all databases and tables.

    Usage: fix_ipa
    < -h host >
    < -d database > [-t table | -P partnum]
    < -S >
    < -w waittime >
    < -o>
    < -c commit_count >
    < -p PDQRPIORITY >
    fix_ipa -l
    fix_ipa -?
    fix_ipa -V

    -l - List mode. Just list the tables that need fixing.
    -d - Specify a database to process. Default: all.
    -t - Specify a table to process. Default: all in selected database.
    -P - Specify a partnm to process. Default: all in selected database.
    -h - Host to update Default: $INFORMIXSERVER.
    -S - Silent mode. Supress messages.
    -V - Print version information and exit.
    -c - Commit after commit_count rows updated. Default: 10,000 rows.
    -w - # of seconds to wait for locked rows to be released (if < 0 wait
    forever). Default 10.
    -p - PDQPRIORITY to set for the task.


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