| From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
|---|---|
| To: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Stephen Frost <sfrost(at)snowman(dot)net>, Greg Smith <greg(at)2ndquadrant(dot)com>, Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi>, Boxuan Zhai <bxzhai2010(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Re: new patch of MERGE (merge_204) & a question about duplicated ctid |
| Date: | 2011-01-03 16:29:19 |
| Message-ID: | 1294072159.19612.1452.camel@ebony |
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| Lists: | pgsql-hackers |
On Mon, 2011-01-03 at 18:08 +0200, Heikki Linnakangas wrote:
> It works in read committed mode, because you acquire a new snapshot
> after the LOCK TABLE, and anyone else who modified the table must commit
> before the lock is granted. In serializable mode you get a serialization
> error.
If its not safe without this
LOCK TABLE ... IN SHARE ROW EXCLUSIVE MODE
then we should do that automatically, and document that.
--
Simon Riggs http://www.2ndQuadrant.com/books/
PostgreSQL Development, 24x7 Support, Training and Services
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