| From: | Heikki Linnakangas <hlinnaka(at)iki(dot)fi> |
|---|---|
| To: | Alexander Korotkov <a(dot)korotkov(at)postgrespro(dot)ru> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Jeff Davis <pgsql(at)j-davis(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Greg Stark <stark(at)mit(dot)edu>, Andres Freund <andres(at)2ndquadrant(dot)com>, Rajeev rastogi <rajeev(dot)rastogi(at)huawei(dot)com>, Markus Wanner <markus(at)bluegap(dot)ch>, Ants Aasma <ants(at)cybertec(dot)at>, Bruce Momjian <bruce(at)momjian(dot)us>, obartunov <obartunov(at)postgrespro(dot)ru>, Teodor Sigaev <teodor(at)postgrespro(dot)ru> |
| Subject: | Re: Proposal for CSN based snapshots |
| Date: | 2016-08-10 17:10:00 |
| Message-ID: | f4ffe7d1-60db-7fda-949c-6863e370fa8b@iki.fi |
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| Lists: | pgsql-hackers |
On 08/10/2016 07:54 PM, Alexander Korotkov wrote:
> Do I understand right that now async commit right as follows?
> 1) Async transaction confirms commit before flushing WAL.
Yes.
> 2) Other transactions sees effect of async transaction only when its WAL
> flushed.
No. Other transactions also see the effects of the async transaction
before it's flushed.
> 3) In the session which just committed async transaction, effect of this
> transaction is visible immediately (before WAL flushed). Is it true?
Yes. (The same session is not a special case, per previous point. All
sessions see the async transaction as committed, even before it's flushed.)
- Heikki
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