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autovacuum: handle analyze for partitioned tables

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Previously, autovacuum would completely ignore partitioned tables, which
is not good regarding analyze -- failing to analyze those tables means
poor plans may be chosen.  Make autovacuum aware of those tables by
propagating "changes since analyze" counts from the leaf partitions up
the partitioning hierarchy.

This also introduces necessary reloptions support for partitioned tables
(autovacuum_enabled, autovacuum_analyze_scale_factor,
autovacuum_analyze_threshold).  It's unclear how best to document this
aspect.

Author: Yuzuko Hosoya <yuzukohosoya@gmail.com>
Reviewed-by: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Reviewed-by: Tomas Vondra <tomas.vondra@enterprisedb.com>
Reviewed-by: Álvaro Herrera <alvherre@alvh.no-ip.org>
Discussion: https://postgr.es/m/CAKkQ508_PwVgwJyBY=0Lmkz90j8CmWNPUxgHvCUwGhMrouz6UA@mail.gmail.com
This commit is contained in:
Alvaro Herrera
2021-04-08 01:19:36 -04:00
parent b3ee4c5038
commit 0827e8af70
7 changed files with 257 additions and 44 deletions
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25
src/include/pgstat.h
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@ -69,6 +69,7 @@ typedef enum StatMsgType
PGSTAT_MTYPE_AUTOVAC_START,
PGSTAT_MTYPE_VACUUM,
PGSTAT_MTYPE_ANALYZE,
PGSTAT_MTYPE_ANL_ANCESTORS,
PGSTAT_MTYPE_ARCHIVER,
PGSTAT_MTYPE_BGWRITER,
PGSTAT_MTYPE_WAL,
@ -106,7 +107,7 @@ typedef int64 PgStat_Counter;
*
* tuples_inserted/updated/deleted/hot_updated count attempted actions,
* regardless of whether the transaction committed. delta_live_tuples,
* delta_dead_tuples, and changed_tuples are set depending on commit or abort.
* delta_dead_tuples, changed_tuples are set depending on commit or abort.
* Note that delta_live_tuples and delta_dead_tuples can be negative!
* ----------
*/
@ -429,6 +430,25 @@ typedef struct PgStat_MsgAnalyze
PgStat_Counter m_dead_tuples;
} PgStat_MsgAnalyze;
/* ----------
* PgStat_MsgAnlAncestors Sent by the backend or autovacuum daemon
* to inform partitioned tables that are
* ancestors of a partition, to propagate
* analyze counters
* ----------
*/
#define PGSTAT_NUM_ANCESTORENTRIES \
((PGSTAT_MSG_PAYLOAD - sizeof(Oid) - sizeof(Oid) - sizeof(int)) \
/ sizeof(Oid))
typedef struct PgStat_MsgAnlAncestors
{
PgStat_MsgHdr m_hdr;
Oid m_databaseid;
Oid m_tableoid;
int m_nancestors;
Oid m_ancestors[PGSTAT_NUM_ANCESTORENTRIES];
} PgStat_MsgAnlAncestors;
/* ----------
* PgStat_MsgArchiver Sent by the archiver to update statistics.
@ -674,6 +694,7 @@ typedef union PgStat_Msg
PgStat_MsgAutovacStart msg_autovacuum_start;
PgStat_MsgVacuum msg_vacuum;
PgStat_MsgAnalyze msg_analyze;
PgStat_MsgAnlAncestors msg_anl_ancestors;
PgStat_MsgArchiver msg_archiver;
PgStat_MsgBgWriter msg_bgwriter;
PgStat_MsgWal msg_wal;
@ -769,6 +790,7 @@ typedef struct PgStat_StatTabEntry
PgStat_Counter n_live_tuples;
PgStat_Counter n_dead_tuples;
PgStat_Counter changes_since_analyze;
PgStat_Counter changes_since_analyze_reported;
PgStat_Counter inserts_since_vacuum;
PgStat_Counter blocks_fetched;
@ -975,6 +997,7 @@ extern void pgstat_report_vacuum(Oid tableoid, bool shared,
extern void pgstat_report_analyze(Relation rel,
PgStat_Counter livetuples, PgStat_Counter deadtuples,
bool resetcounter);
extern void pgstat_report_anl_ancestors(Oid relid);
extern void pgstat_report_recovery_conflict(int reason);
extern void pgstat_report_deadlock(void);