From: Tom Lane <tgl@sss.pgh.pa.us>
To: coers@intrinsity.com
Cc: pgsql-general@postgresql.org
Subject: Re: Copy
Date: Mon, 30 Apr 2001 18:16:06 -0400
Message-ID: <391.988668966@sss.pgh.pa.us> (raw)
In-Reply-To: <3AEDDECF.6B3ED075@intrinsity.com>
References: <Pine.LNX.4.21.0104261634460.2565-100000@olympus.scw.org>
<3AE89D2C.409BEF42@intrinsity.com>
<3AEDB916.BE3123A0@intrinsity.com>
<3AEDDECF.6B3ED075@intrinsity.com>
John Coers <coers@intrinsity.com> writes:
> Does a COPY FROM block? In case I am using the wrong terminology,
> what I need to know is if I have multiple clients performing COPY FROM...PQputline()
> using asynchronous connections, will I lose data?
No.
> Will the server simply execute them serially?
They'll be executed in parallel, just the same as if each client had
done a bunch of INSERTs wrapped in a BEGIN/END block. You'd only see
problems if clients inserted conflicting data (eg, identical keys in
a column with a UNIQUE index). You may care to read the documentation
about multi-version concurrency control and locking.
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, coers@intrinsity.com, pgsql-general@postgresql.org
Subject: Re: Copy
In-Reply-To: <391.988668966@sss.pgh.pa.us>
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