Transactions to create pg_multixact members and offsets

From: Dev Kumkar <devdas(dot)kumkar(at)gmail(dot)com>
To: "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org>
Subject: Transactions to create pg_multixact members and offsets
Date: 2014-11-20 17:36:48
Message-ID: CALSLE1Oyzn5ASy9i8hdtnMQ-oNqqjJhJoTBvRJbH9Yvr-WoAFg@mail.gmail.com
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Hellos,

How to manually increase pg_multixact members and offsets?

Does a transaction waiting for exclusive lock or shared lock result into
entry being created in pg_multixact?

Excerpt of multixact.c:
/*-------------------------------------------------------------------------
2 *
3 * multixact.c
4 * PostgreSQL multi-transaction-log manager
5 *
6 * The pg_multixact manager is a pg_clog-like manager that stores an
array of
7 * MultiXactMember for each MultiXactId. It is a fundamental part of the
8 * shared-row-lock implementation.

Regards...

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