| From: | "Heikki Linnakangas" <heikki(at)enterprisedb(dot)com> |
|---|---|
| To: | "Pavan Deolasee" <pavan(dot)deolasee(at)gmail(dot)com> |
| Cc: | "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "Craig Ringer" <craig(at)postnewspapers(dot)com(dot)au>, "pgsql-patches" <pgsql-patches(at)postgresql(dot)org> |
| Subject: | Re: [PERFORM] Very slow (2 tuples/second) sequential scan after bulk insert; speed returns to ~500 tuples/second after commit |
| Date: | 2008-03-12 17:33:47 |
| Message-ID: | 47D813FB.1000006@enterprisedb.com |
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| Thread: | |
| Lists: | pgsql-patches pgsql-performance |
Pavan Deolasee wrote:
> Wait. Subtransaction ids are local to a transaction and always start from 1.
> See this:
>
> /*
> * reinitialize within-transaction counters
> */
> s->subTransactionId = TopSubTransactionId;
> currentSubTransactionId = TopSubTransactionId;
No, we're not talking about SubTransactionIds. We're talking about real
XIDs assigned to subtransactions. Subtransactions are assigned regular
XIDs as well, just like top-level transactions.
I can see where you were coming from with you suggestion now :-).
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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| Next Message | Pavan Deolasee | 2008-03-12 17:48:50 | Re: [PERFORM] Very slow (2 tuples/second) sequential scan after bulk insert; speed returns to ~500 tuples/second after commit |
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