Hi To test my PITR-slave readonly-query patch, I continously do insert into test ... pg_switch_xlog() sleep 1 on the master, and let the slave process the generated xlogs
The log output on the slave looks the following (unnecessary lines remove) LOG: restored log file "00000001000000000000016E" from archive LOG: REDO @ 0/16E00020; LSN 0/16E0004C: prev 0/16D00098; xid 1346: Transaction - commit: 2007-07-12 15:43:00.686056+02 LOG: REDO @ 0/16E0004C; LSN 0/16E0008C: prev 0/16E00020; xid 0: XLOG - checkpoint: redo 0/16E00020; tli 1; xid 0/1347; oid 24576; multi 1; offset 0; online LOG: REDO @ 0/16E0008C; LSN 0/16E00140: prev 0/16E0004C; xid 1350: Sequence - log: rel 1663/1/16384 LOG: REDO @ 0/16E00140; LSN 0/16E00B88: prev 0/16E0008C; xid 1350; bkpb1: Heap - insert: rel 1663/1/16386; tid 2/49 LOG: REDO @ 0/16E00B88; LSN 0/16F00000: prev 0/16E00140; xid 1350: XLOG - xlog switch LOG: restored log file "00000001000000000000016F" from archive LOG: REDO @ 0/16F00020; LSN 0/16F0004C: prev 0/16E00B88; xid 1350: Transaction - commit: 2007-07-12 15:43:02.159717+02 LOG: REDO @ 0/16F0004C; LSN 0/16F00098: prev 0/16F00020; xid 1352: Heap - insert: rel 1663/1/16386; tid 2/50 LOG: REDO @ 0/16F00098; LSN 0/17000000: prev 0/16F0004C; xid 1352: XLOG - xlog switch LOG: restored log file "000000010000000000000170" from archive LOG: REDO @ 0/17000020; LSN 0/1700004C: prev 0/16F00098; xid 1352: Transaction - commit: 2007-07-12 15:43:02.26456+02 LOG: REDO @ 0/1700004C; LSN 0/17000098: prev 0/17000020; xid 1356: Heap - insert: rel 1663/1/16386; tid 2/51 LOG: REDO @ 0/17000098; LSN 0/17100000: prev 0/1700004C; xid 1356: XLOG - xlog switch As you can see, the COMMIT records seems to end up being logged *after* the xlog switch. I would have expected the order "heap-insert, commit, switch, heap-insert, commit, switch, ...", not "heap-insert, switch, commit, heap-insert, switch, commit, ...". Is this the expected behaviour, or just an artefact of the implementation of xlog switches? greetings, Florian Pflug ---------------------------(end of broadcast)--------------------------- TIP 4: Have you searched our list archives? http://archives.postgresql.org