From: | Jim Nasby <Jim(dot)Nasby(at)BlueTreble(dot)com> |
---|---|
To: | Sridhar N Bamandlapally <sridhar(dot)bn1(at)gmail(dot)com>, Venkata Balaji N <nag1010(at)gmail(dot)com> |
Cc: | pgsql-general <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: avoid lock conflict between SELECT and TRUNCATE |
Date: | 2015-09-15 07:04:05 |
Message-ID: | 55F7C2E5.1060304@BlueTreble.com |
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Thread: | |
Lists: | pgsql-general |
On 9/11/15 4:50 AM, Sridhar N Bamandlapally wrote:
> 1) creating temporary table (say temp_users) on table users with
> required data/columns-list and index on column user_id,
> ...this will be faster as there will be no joins with other tables
>
> 2) also need index on table auths_with_trans column user_id
>
> 3) replacing users with temp_users in BEGIN block
That's not really going to help unless the slow part is that you're
using a cursor (which is why I don't like them...)
FWIW, now that there's better transactional visibility support in the
catalogs it might be possible to reduce the lock contention of trunkcate.
--
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
Data in Trouble? Get it in Treble! http://BlueTreble.com
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