greenplumn clogdesc 源码
greenplumn clogdesc 代码
文件路径：/src/backend/access/rmgrdesc/clogdesc.c
/*-------------------------------------------------------------------------
*
* clogdesc.c
* rmgr descriptor routines for access/transam/clog.c
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/access/rmgrdesc/clogdesc.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/clog.h"
void
clog_desc(StringInfo buf, XLogReaderState *record)
{
char *rec = XLogRecGetData(record);
uint8 info = XLogRecGetInfo(record) & ~XLR_INFO_MASK;
if (info == CLOG_ZEROPAGE)
{
int pageno;
memcpy(&pageno, rec, sizeof(int));
appendStringInfo(buf, "page %d", pageno);
}
else if (info == CLOG_TRUNCATE)
{
xl_clog_truncate xlrec;
memcpy(&xlrec, rec, sizeof(xl_clog_truncate));
appendStringInfo(buf, "page %d; oldestXact %u",
xlrec.pageno, xlrec.oldestXact);
}
}
const char *
clog_identify(uint8 info)
{
const char *id = NULL;
switch (info & ~XLR_INFO_MASK)
{
case CLOG_ZEROPAGE:
id = "ZEROPAGE";
break;
case CLOG_TRUNCATE:
id = "TRUNCATE";
break;
}
return id;
}
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