| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | Hiroshi Inoue <Inoue(at)tpf(dot)co(dot)jp> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers(at)postgreSQL(dot)org |
| Subject: | Re: [HACKERS] Concurrent VACUUM: first results |
| Date: | 1999-11-26 04:11:25 |
| Message-ID: | 199911260411.XAA21985@candle.pha.pa.us |
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| Lists: | pgsql-hackers |
> I have a anxiety about the index of pg_statistic(pg_statistic itself also
> ?).
>
> vc_updstats() may be called in immediately committed mode.
> vacuum calls TransactionIdCommit() after moving tuples in order
> to delete index tuples and truncate the relation safely.
>
> It's necessary but the state is out of PostgreSQL's recovery
> mechanism.
> heap_insert() is imediately committed. If index_insert() fails
> there remains a heap tuple which doesn't have a corresponding
> index entry.
Huh. Heap_insert writes to disk, but there it is not used unless the
transaction gets committed, right?
--
Bruce Momjian | http://www.op.net/~candle
maillist(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
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