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1、啟動(dòng)恢復(fù)時(shí),確定恢復(fù)到的時(shí)間線recoveryTargetTLI
1)歸檔恢復(fù)點(diǎn)比checkpoint中記錄的時(shí)間線大,那么選擇歸檔恢復(fù)點(diǎn)作為目標(biāo)時(shí)間線
2)否則,checkpoint記錄中的時(shí)間線作為目標(biāo)時(shí)間線
StartupXLOG-> if (ControlFile->minRecoveryPointTLI > ControlFile->checkPointCopy.ThisTimeLineID) recoveryTargetTLI = ControlFile->minRecoveryPointTLI; else recoveryTargetTLI = ControlFile->checkPointCopy.ThisTimeLineID; ...
2、接著從recovery.conf文件中讀取
1)若設(shè)置了recovery_target_timeline值,并且設(shè)為latest,那么history列表最大的時(shí)間線即為目標(biāo)時(shí)間線
2)否則是recovery.conf文件中設(shè)置的時(shí)間線值
3)若沒有設(shè)置recovery_target_timeline值,則目標(biāo)時(shí)間線為第一步中的值
StartupXLOG->readRecoveryCommandFile()-> for (item = head; item; item = item->next){ if (strcmp(item->name, "restore_command") == 0){ ... }else if ... else if(strcmp(item->name, "recovery_target_timeline") == 0){ rtliGiven = true; if (strcmp(item->value, "latest") == 0) rtli = 0; else rtli = (TimeLineID) strtoul(item->value, NULL, 0); }else if... } if (rtliGiven){ if (rtli){ recoveryTargetTLI = rtli; recoveryTargetIsLatest = false; }else{ /* We start the "latest" search from pg_control's timeline */ recoveryTargetTLI = findNewestTimeLine(recoveryTargetTLI); recoveryTargetIsLatest = true; } }
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