| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Gokulakannan Somasundaram <gokul007(at)gmail(dot)com> |
| Cc: | "simon(at)2ndquadrant(dot)com" <simon(at)2ndquadrant(dot)com>, PG Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Lazy Snapshots |
| Date: | 2009-08-22 13:43:31 |
| Message-ID: | 8308.1250948611@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Gokulakannan Somasundaram <gokul007(at)gmail(dot)com> writes:
> I have given some thought in this direction. I am just providing my idea.
> a) Have a structure similar to commit log, which should also store,
> transaction id at which the transaction got committed. Every transaction,
> after committing should update the transaction id at which the commit has
> happened
The maintenance costs and update contention for such a datastructure
would render this completely impractical, even if consulting it were
free.
regards, tom lane
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