Re: Hot Standby dev build (v8)

From: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>
To: Simon Riggs <simon(at)2ndQuadrant(dot)com>
Cc: pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Hot Standby dev build (v8)
Date: 2009-01-19 12:00:35
Message-ID: 49746B63.1050302@enterprisedb.com
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Simon Riggs wrote:
> GetSnapshotData() sets
> RecentGlobalXmin to the result of the snapshot's xmin.

No. RecentGlobalXmin is set to the oldest *xmin* observed, across all
running transactions. TransactionXmin is the xid of the oldest running
transaction. IOW, RecentGlobalXmin is the xid of transaction that the
oldest running transaction sees as running.

--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com

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