database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-11-09 06:21:09 +03:00
Code Activity

Add contrib/pg_walinspect.

Browse Source 
Provides similar functionality to pg_waldump, but from a SQL interface
rather than a separate utility.

Author: Bharath Rupireddy
Reviewed-by: Greg Stark, Kyotaro Horiguchi, Andres Freund, Ashutosh Sharma, Nitin Jadhav, RKN Sai Krishna
Discussion: https://postgr.es/m/CALj2ACUGUYXsEQdKhEdsBzhGEyF3xggvLdD8C0VT72TNEfOiog%40mail.gmail.com
This commit is contained in:
Jeff Davis
2022-04-08 00:02:10 -07:00
parent 708007dced
commit 2258e76f90
25 changed files with 1675 additions and 204 deletions
Download Patch File Download Diff File Expand all files Collapse all files

93
src/backend/access/transam/xlogstats.c Normal file
View File

@@ -0,0 +1,93 @@
/*-------------------------------------------------------------------------
*
* xlogstats.c
* Functions for WAL Statitstics
*
* Copyright (c) 2022, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/backend/access/transam/xlogstats.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/xlogreader.h"
#include "access/xlogstats.h"
/*
* Calculate the size of a record, split into !FPI and FPI parts.
*/
void
XLogRecGetLen(XLogReaderState *record, uint32 *rec_len,
uint32 *fpi_len)
{
int block_id;
/*
* Calculate the amount of FPI data in the record.
*
* XXX: We peek into xlogreader's private decoded backup blocks for the
* bimg_len indicating the length of FPI data.
*/
*fpi_len = 0;
for (block_id = 0; block_id <= XLogRecMaxBlockId(record); block_id++)
{
if (XLogRecHasBlockImage(record, block_id))
*fpi_len += XLogRecGetBlock(record, block_id)->bimg_len;
}
/*
* Calculate the length of the record as the total length - the length of
* all the block images.
*/
*rec_len = XLogRecGetTotalLen(record) - *fpi_len;
}
/*
* Store per-rmgr and per-record statistics for a given record.
*/
void
XLogRecStoreStats(XLogStats *stats, XLogReaderState *record)
{
RmgrId rmid;
uint8 recid;
uint32 rec_len;
uint32 fpi_len;
Assert(stats != NULL && record != NULL);
stats->count++;
rmid = XLogRecGetRmid(record);
XLogRecGetLen(record, &rec_len, &fpi_len);
/* Update per-rmgr statistics */
stats->rmgr_stats[rmid].count++;
stats->rmgr_stats[rmid].rec_len += rec_len;
stats->rmgr_stats[rmid].fpi_len += fpi_len;
/*
* Update per-record statistics, where the record is identified by a
* combination of the RmgrId and the four bits of the xl_info field that
* are the rmgr's domain (resulting in sixteen possible entries per
* RmgrId).
*/
recid = XLogRecGetInfo(record) >> 4;
/*
* XACT records need to be handled differently. Those records use the
* first bit of those four bits for an optional flag variable and the
* following three bits for the opcode. We filter opcode out of xl_info
* and use it as the identifier of the record.
*/
if (rmid == RM_XACT_ID)
recid &= 0x07;
stats->record_stats[rmid][recid].count++;
stats->record_stats[rmid][recid].rec_len += rec_len;
stats->record_stats[rmid][recid].fpi_len += fpi_len;
}