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Thread: Reindex after upgrade from PostgreSQL 12.10 to PostgreSQL 15.3

Reindex after upgrade from PostgreSQL 12.10 to PostgreSQL 15.3

From
Hellen Jiang
Date:

Hi,

I am going to upgrade our production database( postgresql 12.10) to postgresql 15.3.

After upgrade to 15.3,  Do you have to do re-index?

If I have to do re-index,  can I only do re-index on some partitioned tables?

We have a lot of big tables which are partitioned by date, for example, table1 has partitioned table by month table1_2023_01, table1_2023_02 , table1_2023_03 and so on.

Will that be good if I only run reindex on some partitioned table(table1_2023_06 and table1_2023_07), for example, REINDEX (VERBOSE) TABLE table1_2023_06; REINDEX (VERBOSE) TABLE table1_2023_07;

After reindex part of tables, I will run ANALYZE with vaccumdb

vacuumdb --analyze-only --jobs=8 -d <mydatabase>

 

Will the performance be as good as before I upgrade?

 

 

Thanks,

 

Re: Reindex after upgrade from PostgreSQL 12.10 to PostgreSQL 15.3

From
Laurenz Albe
Date:
On Thu, 2023-07-27 at 20:02 +0000, Hellen Jiang wrote:
> I am going to upgrade our production database( postgresql 12.10) to postgresql 15.3.
> After upgrade to 15.3,  Do you have to do re-index?

That is not necessary after a PostgreSQL upgrade.

(It may be necessary if you upgrade the operating system.)

> Will the performance be as good as before I upgrade?

It should be at least as good, but sometimes it isn't.
That's why you test (and tune if necessary).

Yours,
Laurenz Albe