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btree page recycling can be done as soon as page's next-xact label is

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older than current Xmin; we don't have to wait till it's older than
GlobalXmin.
This commit is contained in:
Tom Lane
2003-02-23 23:20:52 +00:00
parent 3bbd6af37c
commit 61b22d3aab
4 changed files with 13 additions and 8 deletions
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9
src/backend/storage/ipc/sinval.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/ipc/sinval.c,v 1.53 2002/11/21 06:36:08 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/ipc/sinval.c,v 1.54 2003/02/23 23:20:52 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -298,9 +298,10 @@ GetOldestXmin(bool allDbs)
* This ensures that the set of transactions seen as "running" by the
* current xact will not change after it takes the snapshot.
*
* Also, we compute the current global xmin (oldest xmin across all running
* We also compute the current global xmin (oldest xmin across all running
* transactions) and save it in RecentGlobalXmin. This is the same
* computation done by GetOldestXmin(TRUE).
* computation done by GetOldestXmin(TRUE). The xmin value is also stored
* into RecentXmin.
*----------
*/
Snapshot
@@ -419,7 +420,9 @@ GetSnapshotData(bool serializable)
if (TransactionIdPrecedes(xmin, globalxmin))
globalxmin = xmin;
/* Update globals for use by VACUUM */
RecentGlobalXmin = globalxmin;
RecentXmin = xmin;
snapshot->xmin = xmin;
snapshot->xmax = xmax;