Pokračování článku ««.
V článku bude podrobně probráno a ukázáno na konkrétních dotazech a příkladech, jaké užitečné informace lze získat díky pohledu pg_stat_activity.
Upozornění.
Vzhledem k novosti tématu a nedokončení testovacího období může článek obsahovat chyby. Kritika a připomínky jsou vítány a očekávány.
Vstupní data
Historie pohledu pg_stat_statements
pg_stat_history
VYTVOŘIT TABULKU pg_stat_history (
id SERIAL,
snapshot_timestamp timestamp bez časového pásma,
database_id integer,
dbid oid,
userid oid,
queryid bigint,
query text,
calls bigint,
total_time double precision,
min_time double precision,
max_time double precision,
mean_time double precision,
stddev_time double precision,
rows bigint,
shared_blks_hit bigint,
shared_blks_read bigint,
shared_blks_dirtied bigint,
shared_blks_written bigint,
local_blks_hit bigint,
local_blks_read bigint,
local_blks_dirtied bigint,
local_blks_written bigint,
temp_blks_read bigint,
temp_blks_written bigint,
blk_read_time double precision,
blk_write_time double precision,
baseline_id integer );Tabulka se vyplňuje každou hodinu pomocí dblink na cílovou databázi. Nejzajímavější a nejpoužitelnější sloupec v tabulce je samozřejmě queryid.
Historie pohledu pg_stat_activity
archive_pg_stat_activity
VYTVOŘIT TABULKU archive_pg_stat_activity
(
timepoint timestamp bez časového pásma,
datid oid,
datname název,
pid integer,
usesysid oid,
usename název,
application_name text,
client_addr inet,
client_hostname text,
client_port integer,
backend_start timestamp bez časového pásma,
xact_start timestamp bez časového pásma,
query_start timestamp bez časového pásma,
state_change timestamp bez časového pásma,
wait_event_type text,
wait_event text,
state text,
backend_xid xid,
backend_xmin xid,
query text,
backend_type text,
queryid bigint
);Tabulka představuje hodinově segmentovanou tabulku history_pg_stat_activity (podrobnosti zde — a zde —
Výstupní data
CLUSTER CPU TIME (SYSTÉM + KLIENTI )
Dotaz
S
t AS
(
SELECT
date_trunc('second', timepoint)
FROM activity_hist.archive_pg_stat_activity aa
WHERE timepoint MEZI pg_stat_history_begin+(current_hour_diff * interval '1 hour') A pg_stat_history_end+(current_hour_diff * interval '1 hour') A
( aa.wait_event_type IS NULL ) A
aa.state = 'active'
)
SELECT count(*)
INTO cpu_total
FROM t ;Příklad
CLUSTER CPU TIME (SYSTÉM + KLIENTI ) : 28:37:46CLUSTER WAITINGS TIME
Dotaz
S
t AS
(
SELECT
date_trunc('second', timepoint)
FROM activity_hist.archive_pg_stat_activity aa
WHERE timepoint MEZI pg_stat_history_begin+(current_hour_diff * interval '1 hour') A pg_stat_history_end+(current_hour_diff * interval '1 hour') A
( aa.wait_event_type IS NOT NULL ) A
aa.state = 'active'
)
SELECT count(*)
INTO cpu_total
FROM t ;Příklad
CLUSTER WAITINGS TIME : 30:12:49Celkové hodnoty pg_stat_statements
Dotaz
--TOTAL pg_stat
SELECT
SUM(calls) AS calls, SUM(total_time) AS total_time, SUM(rows) AS rows ,
SUM(shared_blks_hit) AS shared_blks_hit,SUM(shared_blks_read) AS shared_blks_read ,
SUM(shared_blks_dirtied) AS shared_blks_dirtied,SUM(shared_blks_written) AS shared_blks_written ,
SUM(local_blks_hit) AS local_blks_hit , SUM(local_blks_read) AS local_blks_read ,
SUM(local_blks_dirtied) AS local_blks_dirtied , SUM(local_blks_written) AS local_blks_written,
SUM(temp_blks_read) AS temp_blks_read, SUM(temp_blks_written) temp_blks_written ,
SUM(blk_read_time) AS blk_read_time , SUM(blk_write_time) AS blk_write_time
INTO
pg_total_stat_history_rec
FROM
pg_stat_history
WHERE
snapshot_timestamp BETWEEN pg_stat_history_begin AND pg_stat_history_end AND
queryid IS NULL;SQL DBTIME — celkové trvání vykonávání dotazů
Dotaz
dbtime_total = interval '1 millisecond' * pg_total_stat_history_rec.total_time ;Příklad
SQL DBTIME : 136:49:36SQL CPU TIME — čas CPU vynaložený na vykonávání dotazů
Dotaz
WITH
t AS
(
SELECT
date_trunc('second', timepoint)
FROM activity_hist.archive_pg_stat_activity aa
WHERE timepoint BETWEEN pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND pg_stat_history_end+(current_hour_diff * interval '1 hour') AND
( aa.wait_event_type IS NULL ) AND
backend_type = 'client backend' AND
aa.state = 'active'
)
SELECT count(*)
INTO cpu_total
FROM t ;Příklad
SQL CPU TIME : 27:40:15SQL WAITINGS TIME — celkové trvání čekání pro dotazy
Dotaz
WITH
t AS
(
SELECT
date_trunc('second', timepoint)
FROM activity_hist.archive_pg_stat_activity aa
WHERE timepoint BETWEEN pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND pg_stat_history_end+(current_hour_diff * interval '1 hour') AND
( aa.wait_event_type IS NOT NULL ) AND
aa.state = 'active' AND
backend_type = 'client backend'
)
SELECT count(*)
INTO waiting_total
FROM t ;Příklad
SQL WAITINGS TIME : 30:04:09Nyní přecházíme k nejzajímavější části
Příklad
| SQL IOTIME : 19:44:50
| SQL READ TIME : 19:44:32
| SQL WRITE TIME : 00:00:17
|
| SQL CALLS : 12188248
-------------------------------------------------------------
| SQL SHARED BLOCKS READS : 7997039120
| SQL SHARED BLOCKS HITS : 8868286092
| SQL SHARED BLOCKS HITS/READS % : 110.89
| SQL SHARED BLOCKS DIRTED : 419945
| SQL SHARED BLOCKS WRITTEN : 19857
|
| SQL TEMPORARY BLOCKS READS : 7836169
| SQL TEMPORARY BLOCKS WRITTEN : 10683938
Přejdeme k nejzajímavější části
STATISTIKY ČEKÁNÍ
TOP 10 ČEKÁNÍ PODLE CELKOVÉHO ČASU ČEKÁNÍ PRO PROCESY KLIENTA
Dotaz
SELECT
wait_event_type , wait_event ,
get_system_waiting_duration( wait_event_type , wait_event ,pg_stat_history_begin+(current_hour_diff * interval '1 hour') ,pg_stat_history_end+(current_hour_diff * interval '1 hour') ) as duration
FROM
activity_hist.archive_pg_stat_activity aa
WHERE
timepoint BETWEEN pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND pg_stat_history_end+(current_hour_diff * interval '1 hour') AND backend_type != 'client backend' AND wait_event_type IS NOT NULL
GROUP BY
wait_event_type, wait_event
ORDER BY 3 DESC
LIMIT 10Příklad
+------------------------------------------------------------------------------------ | TOP 10 ČEKÁNÍ PODLE CELKOVÉ DÉLKY ČEKÁNÍ PRO SYSTÉMOVÉ PROCESY +-----+------------------------------+--------------------+-------------------- | #| wait_event_type| wait_event| duration +-----+------------------------------+--------------------+-------------------- | 1| Activity| LogicalLauncherMain| 10:43:28 | 2| Activity| AutoVacuumMain| 10:42:49 | 3| Activity| WalWriterMain| 10:28:53 | 4| Activity| CheckpointerMain| 10:23:50 | 5| Activity| BgWriterMain| 09:11:59 | 6| Activity| BgWriterHibernate| 01:37:46 | 7| IO| BufFileWrite| 00:02:35 | 8| LWLock| buffer_mapping| 00:01:54 | 9| IO| DataFileRead| 00:01:23 | 10| IO| WALWrite| 00:00:59 +-----+------------------------------+--------------------+--------------------
TOP 10 ČEKÁNÍ PODLE CELKOVÉHO ČASU ČEKÁNÍ PRO PROCESY KLIENTA
Dotaz
VYBERTE
wait_event_type , wait_event ,
get_clients_waiting_duration( wait_event_type , wait_event , pg_stat_history_begin+(current_hour_diff * interval '1 hour') , pg_stat_history_end+(current_hour_diff * interval '1 hour') ) as duration
Z
activity_hist.archive_pg_stat_activity aa
KDE
timepoint MEZI pg_stat_history_begin+(current_hour_diff * interval '1 hour') A pg_stat_history_end+(current_hour_diff * interval '1 hour') A backend_type = 'client backend' A wait_event_type NENÍ NULL
GROUP BY wait_event_type, wait_event
ORDER BY 3 DESC
LIMIT 10Příklad
+-----+------------------------------+--------------------+--------------------+---------- | #| wait_event_type| wait_event| duration| % dbtime +-----+------------------------------+--------------------+--------------------+---------- | 1| Lock| transactionid| 08:16:47| 6.05 | 2| IO| DataFileRead| 06:13:41| 4.55 | 3| Timeout| PgSleep| 02:53:21| 2.11 | 4| LWLock| buffer_mapping| 00:40:42| 0.5 | 5| LWLock| buffer_io| 00:17:17| 0.21 | 6| IO| BufFileWrite| 00:01:34| 0.02 | 7| Lock| tuple| 00:01:32| 0.02 | 8| Client| ClientRead| 00:01:19| 0.02 | 9| IO| BufFileRead| 00:00:37| 0.01 | 10| LWLock| buffer_content| 00:00:08| 0 +-----+------------------------------+--------------------+--------------------+----------
TYPY ČEKÁNÍ PODLE CELKOVÉ DÉLKY ČEKÁNÍ PRO SYSTÉMOVÉ PROCESY
Dotaz
VYBERTE
wait_event_type ,
get_system_waiting_type_duration( wait_event_type , pg_stat_history_begin+(current_hour_diff * interval '1 hour') , pg_stat_history_end+(current_hour_diff * interval '1 hour') ) as duration
Z
activity_hist.archive_pg_stat_activity aa
KDE
timepoint MEZI pg_stat_history_begin+(current_hour_diff * interval '1 hour') A pg_stat_history_end+(current_hour_diff * interval '1 hour') A backend_type != 'client backend' A wait_event_type NENÍ NULL
GROUP BY wait_event_type
ORDER BY 2 DESCPříklad
+-----+------------------------------+-------------------- | #| wait_event_type| duration +-----+------------------------------+-------------------- | 1| Activity| 53:08:45 | 2| IO| 00:06:24 | 3| LWLock| 00:03:02 +-----+------------------------------+--------------------
TYPY ČEKÁNÍ PODLE CELKOVÉ DÉLKY ČEKÁNÍ PRO PROCESY KLIENTŮ
Dotaz
SELECT
wait_event_type ,
get_clients_waiting_type_duration( wait_event_type , pg_stat_history_begin+(current_hour_diff * interval '1 hour') , pg_stat_history_end+(current_hour_diff * interval '1 hour') ) as duration
FROM
activity_hist.archive_pg_stat_activity aa
WHERE
timepoint BETWEEN pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND pg_stat_history_end+(current_hour_diff * interval '1 hour') AND backend_type = 'client backend' AND wait_event_type IS NOT NULL
GROUP BY wait_event_type
ORDER BY 2 DESCPříklad
+-----+------------------------------+--------------------+-------------------- | #| wait_event_type| duration| % dbtime +-----+------------------------------+--------------------+-------------------- | 1| Lock| 08:18:19| 6.07 | 2| IO| 06:16:01| 4.58 | 3| Timeout| 02:53:21| 2.11 | 4| LWLock| 00:58:12| 0.71 | 5| Client| 00:01:19| 0.02 | 6| IPC| 00:00:04| 0 +-----+------------------------------+--------------------+--------------------
Délky čekání pro systémové procesy a jednotlivé dotazy.
ČEKÁNÍ PRO SYSTÉMOVÉ PROCESY
Dotaz
SELECT
backend_type , datname , wait_event_type , wait_event , get_backend_type_waiting_duration( backend_type , wait_event_type , wait_event , pg_stat_history_begin+(current_hour_diff * interval '1 hour') , pg_stat_history_end+(current_hour_diff * interval '1 hour') ) as duration
FROM
activity_hist.archive_pg_stat_activity aa
WHERE
timepoint BETWEEN pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND pg_stat_history_end+(current_hour_diff * interval '1 hour') AND backend_type != 'client backend' AND wait_event_type IS NOT NULL
GROUP BY backend_type , datname , wait_event_type , wait_event
ORDER BY 5 DESCPříklad
+-----+-----------------------------+----------+--------------------+----------------------+-------------------- | #| backend_type| dbname| wait_event_type| wait_event| duration +-----+-----------------------------+----------+--------------------+----------------------+-------------------- | 1| logická replikace launcheru| | Aktivita| LogicalLauncherMain| 10:43:28 | 2| autovacuum launcher| | Aktivita| AutoVacuumMain| 10:42:49 | 3| walwriter| | Aktivita| WalWriterMain| 10:28:53 | 4| checkpointer| | Aktivita| CheckpointerMain| 10:23:50 | 5| background writer| | Aktivita| BgWriterMain| 09:11:59 | 6| background writer| | Aktivita| BgWriterHibernate| 01:37:46 | 7| paralelní pracovník| tdb1| IO| BufFileWrite| 00:02:35 | 8| paralelní pracovník| tdb1| LWLock| buffer_mapping| 00:01:41 | 9| paralelní pracovník| tdb1| IO| DataFileRead| 00:01:22 | 10| paralelní pracovník| tdb1| IO| BufFileRead| 00:00:59 | 11| walwriter| | IO| WALWrite| 00:00:57 | 12| paralelní pracovník| tdb1| LWLock| buffer_io| 00:00:47 | 13| autovacuum pracovník| tdb1| LWLock| buffer_mapping| 00:00:13 | 14| background writer| | IO| DataFileWrite| 00:00:12 | 15| checkpointer| | IO| DataFileWrite| 00:00:11 | 16| walwriter| | LWLock| WALWriteLock| 00:00:09 | 17| checkpointer| | LWLock| WALWriteLock| 00:00:06 | 18| background writer| | LWLock| WALWriteLock| 00:00:06 | 19| walwriter| | IO| WALInitWrite| 00:00:02 | 20| autovacuum pracovník| tdb1| LWLock| WALWriteLock| 00:00:02 | 21| walwriter| | IO| WALInitSync| 00:00:02 | 22| autovacuum pracovník| tdb1| IO| DataFileRead| 00:00:01 | 23| checkpointer| | IO| ControlFileSyncUpdate| 00:00:01 | 24| background writer| | IO| WALWrite| 00:00:01 | 25| background writer| | IO| DataFileFlush| 00:00:01 | 26| checkpointer| | IO| SLRUFlushSync| 00:00:01 | 27| autovacuum pracovník| tdb1| IO| WALWrite| 00:00:01 | 28| checkpointer| | IO| DataFileSync| 00:00:01 +-----+-----------------------------+----------+--------------------+----------------------+--------------------
ČEKÁNÍ NA SQL — čekání na jednotlivé dotazy podle queryid
Dotaz
VYBERTE
queryid, datname, wait_event_type, wait_event, get_query_waiting_duration(queryid, wait_event_type, wait_event, pg_stat_history_begin + (current_hour_diff * interval '1 hour'), pg_stat_history_end + (current_hour_diff * interval '1 hour')) AS duration
Z
activity_hist.archive_pg_stat_activity aa
KDE
timepoint MEZI pg_stat_history_begin + (current_hour_diff * interval '1 hour') A pg_stat_history_end + (current_hour_diff * interval '1 hour') A backend_type = 'client backend' A wait_event_type NENÍ NULL A queryid NENÍ NULL
SKUPINA PODLE queryid, datname, wait_event_type, wait_event
POŘADÍ 1, 5 DESC Příklad
+-----+-------------------------+----------+--------------------+--------------------+--------------------+-------------------- | #| queryid| dbname| wait_event_type| wait_event| waitings| total | | | | | | duration| duration +-----+-------------------------+----------+--------------------+--------------------+--------------------+-------------------- | 1| -8247416849404883188| tdb1| Klient| ClientRead| 00:00:02| | 2| -6572922443698419129| tdb1| Klient| ClientRead| 00:00:05| | 3| -6572922443698419129| tdb1| IO| DataFileRead| 00:00:01| | 4| -5917408132400665328| tdb1| Klient| ClientRead| 00:00:04| | 5| -4091009262735781873| tdb1| Klient| ClientRead| 00:00:03| | 6| -1473395109729441239| tdb1| Klient| ClientRead| 00:00:01| | 7| 28942442626229688| tdb1| IO| BufFileWrite| 00:01:34| 00:46:06 | 8| 28942442626229688| tdb1| LWLock| buffer_mapping| 00:01:05| 00:46:06 | 9| 28942442626229688| tdb1| IO| DataFileRead| 00:00:44| 00:46:06 | 10| 28942442626229688| tdb1| IO| BufFileRead| 00:00:37| 00:46:06 | 11| 28942442626229688| tdb1| LWLock| buffer_io| 00:00:35| 00:46:06 | 12| 28942442626229688| tdb1| Klient| ClientRead| 00:00:05| 00:46:06 | 13| 28942442626229688| tdb1| IPC| MessageQueueReceive| 00:00:03| 00:46:06 | 14| 28942442626229688| tdb1| IPC| BgWorkerShutdown| 00:00:01| 00:46:06 | 15| 389015618226997618| tdb1| Lock| transactionid| 03:55:09| 04:14:15 | 16| 389015618226997618| tdb1| IO| DataFileRead| 03:23:09| 04:14:15 | 17| 389015618226997618| tdb1| LWLock| buffer_mapping| 00:12:09| 04:14:15 | 18| 389015618226997618| tdb1| LWLock| buffer_io| 00:10:18| 04:14:15 | 19| 389015618226997618| tdb1| Lock| tuple| 00:00:35| 04:14:15 | 20| 389015618226997618| tdb1| LWLock| WALWriteLock| 00:00:02| 04:14:15 | 21| 389015618226997618| tdb1| IO| DataFileWrite| 00:00:01| 04:14:15 | 22| 389015618226997618| tdb1| LWLock| SyncScanLock| 00:00:01| 04:14:15 | 23| 389015618226997618| tdb1| Klient| ClientRead| 00:00:01| 04:14:15 | 24| 734234407411547467| tdb1| Klient| ClientRead| 00:00:11| | 25| 734234407411547467| tdb1| LWLock| buffer_mapping| 00:00:05| | 26| 734234407411547467| tdb1| IO| DataFileRead| 00:00:02| | 27| 1237430309438971376| tdb1| LWLock| buffer_mapping| 00:02:18| 02:45:40 | 28| 1237430309438971376| tdb1| IO| DataFileRead| 00:00:27| 02:45:40 | 29| 1237430309438971376| tdb1| Klient| ClientRead| 00:00:02| 02:45:40 | 30| 2404820632950544954| tdb1| Klient| ClientRead| 00:00:01| | 31| 2515308626622579467| tdb1| Klient| ClientRead| 00:00:02| | 32| 4710212362688288619| tdb1| LWLock| buffer_mapping| 00:03:08| 02:18:21 | 33| 4710212362688288619| tdb1| IO| DataFileRead| 00:00:22| 02:18:21 | 34| 4710212362688288619| tdb1| Klient| ClientRead| 00:00:06| 02:18:21 | 35| 4710212362688288619| tdb1| LWLock| buffer_io| 00:00:02| 02:18:21 | 36| 9150846928388977274| tdb1| IO| DataFileRead| 00:01:19| | 37| 9150846928388977274| tdb1| LWLock| buffer_mapping| 00:00:34| | 38| 9150846928388977274| tdb1| Klient| ClientRead| 00:00:10| | 39| 9150846928388977274| tdb1| LWLock| buffer_io| 00:00:01| +-----+-------------------------+----------+--------------------+--------------------+--------------------+--------------------
KLIENTSKÉ SQL STATISTIKY — NEJLEPŠÍ DOTAZY
Dotazy pro získání jsou opět celkem triviální a pro úsporu místa nejsou uvedeny.
Příklady
+------------------------------------------------------------------------------------ | SQL klienta seřazeno podle času trvání +--------------------+----------+----------+----------+----------+----------+-------------------- | čas trvání| volání| % dbtime| % CPU| % IO| dbname| queryid +--------------------+----------+----------+----------+----------+----------+-------------------- | 04:14:15| 19| 3.1| 10.83| 11.52| tdb1| 389015618226997618 | 02:45:40| 746| 2.02| 4.23| 0.08| tdb1| 1237430309438971376 | 02:18:21| 749| 1.69| 3.39| 0.1| tdb1| 4710212362688288619 | 00:46:06| 375| 0.56| 0.94| 0.41| tdb1| 28942442626229688 +--------------------+----------+----------+----------+----------+----------+-------------------- | SQL klienta seřazeno podle času CPU +--------------------+----------+----------+----------+----------+----------+----------+-------------------- | čas CPU| volání| % dbtime|celkový čas| % CPU| % IO| dbname| queryid +--------------------+----------+----------+----------+----------+----------+----------+-------------------- | 02:59:49| 19| 3.1| 04:14:15| 10.83| 11.52| tdb1| 389015618226997618 | 01:10:12| 746| 2.02| 02:45:40| 4.23| 0.08| tdb1| 1237430309438971376 | 00:56:15| 749| 1.69| 02:18:21| 3.39| 0.1| tdb1| 4710212362688288619 | 00:15:35| 375| 0.56| 00:46:06| 0.94| 0.41| tdb1| 28942442626229688 +--------------------+----------+----------+----------+----------+----------+----------+-------------------- | SQL klienta seřazeno podle doby čekání na uživatelský I/O +--------------------+----------+----------+----------+----------+----------+----------+-------------------- | čas čekání I/O| volání| % dbtime|celkový čas| % CPU| % IO| dbname| queryid +--------------------+----------+----------+----------+----------+----------+----------+-------------------- | 03:23:10| 19| 3.1| 04:14:15| 10.83| 11.52| tdb1| 389015618226997618 | 00:02:54| 375| 0.56| 00:46:06| 0.94| 0.41| tdb1| 28942442626229688 | 00:00:27| 746| 2.02| 02:45:40| 4.23| 0.08| tdb1| 1237430309438971376 | 00:00:22| 749| 1.69| 02:18:21| 3.39| 0.1| tdb1| 4710212362688288619 +--------------------+----------+----------+----------+----------+----------+----------+-------------------- | SQL klienta seřazeno podle čtení sdílených bufferů +--------------------+----------+----------+----------+----------+----------+----------+-------------------- | čtení bufferů| volání| % dbtime|celkový čas| % CPU| % IO| dbname| queryid +--------------------+----------+----------+----------+----------+----------+----------+-------------------- | 1056388566| 19| 3.1| 04:14:15| 10.83| 11.52| tdb1| 389015618226997618 | 11709251| 375| 0.56| 00:46:06| 0.94| 0.41| tdb1| 28942442626229688 | 3439004| 746| 2.02| 02:45:40| 4.23| 0.08| tdb1| 1237430309438971376 | 3373330| 749| 1.69| 02:18:21| 3.39| 0.1| tdb1| 4710212362688288619 +--------------------+----------+----------+----------+----------+----------+----------+-------------------- | SQL klienta seřazeno podle doby čtení disku +--------------------+----------+----------+----------+----------+----------+----------+-------------------- | čas čtení| volání| % dbtime|celkový čas| % CPU| % IO| dbname| queryid +--------------------+----------+----------+----------+----------+----------+----------+-------------------- | 02:16:30| 19| 3.1| 04:14:15| 10.83| 11.52| tdb1| 389015618226997618 | 00:04:50| 375| 0.56| 00:46:06| 0.94| 0.41| tdb1| 28942442626229688 | 00:01:10| 749| 1.69| 02:18:21| 3.39| 0.1| tdb1| 4710212362688288619 | 00:00:57| 746| 2.02| 02:45:40| 4.23| 0.08| tdb1| 1237430309438971376 +--------------------+----------+----------+----------+----------+----------+----------+-------------------- | SQL klienta seřazeno podle provedení +--------------------+----------+----------+----------+----------+----------+----------+-------------------- | volání| řádky| % dbtime|celkový čas| % CPU| % IO| dbname| queryid +--------------------+----------+----------+----------+----------+----------+----------+-------------------- | 749| 749| 1.69| 02:18:21| 3.39| 0.1| tdb1| 4710212362688288619 | 746| 746| 2.02| 02:45:40| 4.23| 0.08| tdb1| 1237430309438971376 | 375| 0| 0.56| 00:46:06| 0.94| 0.41| tdb1| 28942442626229688 | 19| 19| 3.1| 04:14:15| 10.83| 11.52| tdb1| 389015618226997618 +--------------------+----------+----------+----------+----------+----------+----------+--------------------
Výsledek
Pomocí poskytnutých dotazů a získávaných reportů je možné získat komplexnější obrázek pro analýzu a řešení problémů s degradací výkonu jak jednotlivých dotazů, tak celého clusteru.
Rozvoj
Plány na rozvoj jsou následující:
- Doplnit report o historii zámků. Dotazy jsou testovány a budou prezentovány v nejbližší době.
- Použít rozšíření TimescaleDB pro ukládání historie pg_stat_activity a pg_locks.
- Připravit balíčkové řešení na github pro masové nasazení na produkčních databázích.
Pokračování příště…
Zdroj: habr.com
