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From: Lok P <[email protected]>
To: sud <[email protected]>
Cc: pgsql-general <[email protected]>
Subject: Re: Creating big indexes
Date: Sun, 9 Jun 2024 13:39:56 +0530
Message-ID: <CAKna9VZXweP1os0YnhYMcvyKHP6NQS7rCCkW-H==KVK=E0ZHPw@mail.gmail.com> (raw)
In-Reply-To: <CAKna9VYFnmcj0m4FtfMsEQbW8-5QSg8=najLbs-DBHMwtDR=DQ@mail.gmail.com>
References: <CAKna9VaOt_FPSSdMQaF0abiAPLdN1jB9renORV+ky2mP1_nDRw@mail.gmail.com>
	<CAD=mzVXtgnFxk0uE6=yaJX8JYY6kt4UiUc-kqi=MyUOCmWp3hg@mail.gmail.com>
	<CAKna9VYFnmcj0m4FtfMsEQbW8-5QSg8=najLbs-DBHMwtDR=DQ@mail.gmail.com>

On Sun, Jun 9, 2024 at 10:39 AM Lok P <[email protected]> wrote:

>
>
> On Sun, Jun 9, 2024 at 10:36 AM sud <[email protected]> wrote:
>
>>
>>  You can first create the index on the table using the "On ONLY"keyword,
>> something as below.
>>
>> CREATE INDEX idx ON ONLY tab(col1);
>>
>> Then create indexes on each partition in "concurrently" from multiple
>> sessions in chunks.
>>
>> CREATE INDEX CONCURRENTLY idx_1    ON tab_part1(col1);
>> CREATE INDEX CONCURRENTLY idx_2    ON tab_part2(col1);
>>
>> After this step finishes the table level index which was created in the
>> first step will be in valid state automatically.
>>
>>
> Thank you so much.
> Should we also tweak the parameters related to the parallelism and memory
> as I mentioned in the first post?
>

Additionally ,is it also possible to drop the indexes also from the big
partition table efficiently? To avoid the "transaction id wrap around" or
"table bloat" when the index drop runs for longer duration?

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