| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | coers(at)intrinsity(dot)com |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Copy |
| Date: | 2001-04-30 22:16:06 |
| Message-ID: | 391.988668966@sss.pgh.pa.us |
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| Lists: | pgsql-admin pgsql-general pgsql-sql |
John Coers <coers(at)intrinsity(dot)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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