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Create Index Locking Question

From: Mike C <smith(dot)not(dot)western(at)gmail(dot)com>
To: pgsql-admin(at)postgresql(dot)org
Subject: Create Index Locking Question
Date: 2005-12-22 20:58:20
Message-ID: bd0eabd0512221258y58b1f42fy8cfae304baffd8e7@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-admin
I need to create a new index on an existing table. The table is constantly
inserted into every second. Does CREATE INDEX require an exclusive write
lock on the table? If it does have a write lock what happens to the insert
statements at the time, are they simply played later or do they fail?

From http://www.postgresql.org/docs/8.1/interactive/sql-reindex.html I see
CREATE INDEX apparently requires a write lock, but I'm not 100% certain
because the CREATE INDEX was used to describe part of the REINDEX command.

The CREATE INDEX page makes no mention of locking issues:
http://www.postgresql.org/docs/8.1/interactive/sql-createindex.html

Could someone please clarify for me: Will I lose the INSERT statements
performed while a CREATE INDEX is running?

Regards,

Mike C.

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