Add WAL usage reporting to ANALYZE VERBOSE output.

This change adds WAL usage reporting to the output of ANALYZE VERBOSE
and autoanalyze reports. It aligns the analyze output with VACUUM,
providing consistency. Additionally, it aids in troubleshooting cases
where WAL records are generated during analyze operations.

Author: Anthonin Bonnefoy
Reviewed-by: Masahiko Sawada
Discussion: https://postgr.es/m/CAO6_Xqr__kTTCLkftqS0qSCm-J7_xbRG3Ge2rWhucxQJMJhcRA%40mail.gmail.com

diff --git a/src/backend/commands/analyze.c b/src/backend/commands/analyze.c
index 902eb1a450863eb5bd8b77f2a49e1b2b6a36d681..38fb4c3ef2328733f2b14152504e17e266f4a5db 100644 (file)
--- a/src/backend/commands/analyze.c
+++ b/src/backend/commands/analyze.c
@@ -305,6 +305,7 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
    Oid         save_userid;
    int         save_sec_context;
    int         save_nestlevel;
+   WalUsage    startwalusage = pgWalUsage;
    BufferUsage startbufferusage = pgBufferUsage;
    BufferUsage bufferusage;
    PgStat_Counter startreadtime = 0;
@@ -740,6 +741,7 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
                                       params->log_min_duration))
        {
            long        delay_in_ms;
+           WalUsage    walusage;
            double      read_rate = 0;
            double      write_rate = 0;
            char       *msgfmt;
@@ -750,6 +752,8 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
 
            memset(&bufferusage, 0, sizeof(BufferUsage));
            BufferUsageAccumDiff(&bufferusage, &pgBufferUsage, &startbufferusage);
+           memset(&walusage, 0, sizeof(WalUsage));
+           WalUsageAccumDiff(&walusage, &pgWalUsage, &startwalusage);
 
            total_blks_hit = bufferusage.shared_blks_hit +
                bufferusage.local_blks_hit;
@@ -818,6 +822,11 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
                             (long long) total_blks_hit,
                             (long long) total_blks_read,
                             (long long) total_blks_dirtied);
+           appendStringInfo(&buf,
+                            _("WAL usage: %lld records, %lld full page images, %llu bytes\n"),
+                            (long long) walusage.wal_records,
+                            (long long) walusage.wal_fpi,
+                            (unsigned long long) walusage.wal_bytes);
            appendStringInfo(&buf, _("system usage: %s"), pg_rusage_show(&ru0));
 
            ereport(verbose ? INFO : LOG,