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StartupLOG:: ->record = ReadcheckpointRecord(xlogreader,CONTROLFILE->checkPoint,1,truE) ->record = ReadRecord(xlogreader,LOG,truE) ->record = XLogReadRecord(xlogreader,&errormsg); ->readOff = ReadPageInternal(state,CONTROLFILE->checkPoint - (CONTROLFILE->checkPoint % XLOG_BLCKSz),Min(ontrolfile->checkPoint % XLOG_BLCKSZ + SizeOfXLogRecord,XLOG_BLCKSz)); ->|--pageptr=CONTROLFILE->checkPoint - (CONTROLFILE->checkPoint % XLOG_BLCKSz) |--targetPageOff = (pageptr % XLogSegSizE);//段文件偏移 |--targetSegmentPtr = pageptr - targetPageOff; |--readLen = state->read_page(state,targetSegmentPtr(0?),XLOG_BLCKSZ,state->readBuf,&state->readPageTli); ->WaitForWALToBecomeAvailable(targetSegmentPtr(0?) + XLOG_BLCKSZ,private->randAccess,targetRecPtr) ->readfile = XLogfileReadAnyTli(targetSegmentPtr/XLogSegSize,DEBUG2,currentsource == XLOG_FROM_ARCHIVE ? XLOG_FROM_ANY :currentsourcE) ->fd = XLogfileRead(segno,emode,tli,XLOG_FROM_ARCHIVE或者XLOG_FROM_pg_WAL,truE) ->fd = Basicopenfile(path,O_RDONLY | pg_BINARY,0); ->fd = open(filename,fileFlags,fileModE)
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