Oracle Automatic Workload Repository (AWR) 12c

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1 XVIII KONFERENCJA STOWARZYSZENIA POLSKIEJ GRUPY UŻYTKOWNIKÓW SYSTEMU ORACLE Oracle Automatic Workload Repository (AWR) 12c Marcin Przepiórowski

2 Principal Oracle DBA Geek Blogger RAC Attack Ninja

3 AWR - co to jest AWR - jak używać AWR - przykład AWR a SQL

4 UTLBSTAT/UTLESTAT DB Optimizer StatsPack Spotlight SQL scripts Toad V$ views

5 DBA badający wolno działająca baze danych

6 Automatic Repository Workload Graham Wood Kyle Hailey John Beresniewicz (JB)

7 Automatyczny machanizm zbierania statystyk always on Dostępny w wersji EE Wymaga Diagnostic Pack

8 Pre-konfigurowany przez Oracle Może być wykorzystany do analizy obecnego stanu bazy danych jak i trendow historycznych

9 MMON Widoki V$ DBA_HIST_... SYSAUX WR...

10 AWR - dane mechanizm zapisu statystyk jest oparty o snapshoty V$ zawierają dane od momentu startu instancji delta / czas może pokazać więcej

11 Niebezpieczeństwo średnich 10 odczytów po 1000 ms 200 odczytów po 5 ms średnia = 9.95 ms na odczyt!!!! Histogram, mediana, percentyl

12 AWR a ASH V$ACTIVE_SESSION_HISTORY Częstotliwość samplowania 1 sek DBA_HIST_ACTIVE_SESS_HISTORY generowany na podstawie V$ - częstotliwość samplowania 10 sek

13 Nowe sekcje raportu 12c Replication Statistics (Golden Gate XStream) ADDM Reports Nowe widoki i kolumny w każdej wersji

14 10g SQL> select count(*) from dba_views where view_name like 'DBA_HIST%'; COUNT(*) c SQL> select count(*) from dba_views where view_name like 'DBA_HIST%'; COUNT(*)

15 AWR - jak używać

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20 WORKLOAD REPOSITORY report for DB Name DB Id Instance Inst Num Startup Time Release RAC TESTRAC testrac Sep-13 10: YES Host Name Platform CPUs Cores Sockets Memory(GB) rac1.localdomain Linux x86 64-bit Snap Id Snap Time Sessions Curs/Sess Begin Snap: Sep-13 10:49: End Snap: Sep-13 11:53: Elapsed: (mins) DB Time: 1.48 (mins) Cache Sizes Begin End ~~~~~~~~~~~ Buffer Cache: 1,152M 1,152M Std Block Size: 8K Shared Pool Size: 400M 400M Log Buffer: 20

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22 DB TIME Oracle doc Database time represents the total time spent in database and is an indicator of the total instance workload calls, ASH samples counts = DB Time in seconds (proof in DB Time Oracle Performance Tuning: Theory and Practice by Graham Wood, John Beresniewicz)

23 Average Active Sessions AAS = DB Time / Elapsed clock time Average Active Session using ASH samples AAS = ASH samples ( t=1s)/ Elapsed clock time Average active sessions: the magic metric? - John Beresniewicz

24 AWR AWR SQL ASH ASH sesja / sql Trace awrrpt.sql ashrpt.sql awrsqrpt.sql dbms_monitor / event tkprof vs raw file vs TRCA 3rd party Mr Trace

25 Zbieranie faktów Lokalizacja problemu Metryki

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29 WORKLOAD REPOSITORY report for DB Name DB Id Instance Inst Num Release RAC Host IRIS IRIS NO hprod Snap Id Snap Time Sessions Curs/Sess Begin Snap: Apr-14 18:00: End Snap: Apr-14 22:00: Elapsed: (mins) DB Time: 4, (mins) Top 5 Timed Events Avg %Total Cache ~~~~~~~~~~~~~~~~~~ Sizes ~~~~~~~~~~~ Event Begin End Waits Time (s) wait (ms) Call Time Wait Class log file switch Buffer (checkpoint Cache: 13,056M in 13,056M 276,536 Std Block Size: 185,014 8K Configurat Shared Pool Size: 2,512M 2,512M Log Buffer: 14,336K buffer busy waits 25,969 24, Concurrenc enq: SQ - contention 6,820 19, Configurat db file sequential read 2,229,562 18, User I/O CPU time 14, Load Profile ~~~~~~~~~~~~ Per Second Per Transaction Redo size: 1,317, , Logical reads: 94, , Block changes: 6, Physical reads: Physical writes: User calls: Parses: Hard parses: Sorts: Logons: Executes: 3, Transactions:

30 WORKLOAD REPOSITORY report for DB Name DB Id Instance Inst Num Release RAC Host IRIS IRIS NO hprod Snap Id Snap Time Sessions Curs/Sess Begin Snap: Apr-14 09:00: End Snap: Apr-14 09:00: Elapsed: 1, (mins) DB Time: 10, (mins) Top 5 Timed Events Avg %Total ~~~~~~~~~~~~~~~~~~ wait Call Cache Sizes Event Waits Time (s) (ms) Time Wait Class ~~~~~~~~~~~ Begin End log file switch Buffer (checkpoint Cache: 13,056M in 13,056M 276,536 Std Block Size: 185,014 8K Configurat CPU time Shared Pool Size: 2,512M 2,512M Log Buffer: 114,473 14,336K 18.1 db file sequential read 17,330, , User I/O io done 11,144,219 26, System I/O buffer busy waits 29,933 24, Concurrenc Load Profile ~~~~~~~~~~~~ Per Second Per Transaction Redo size: 571, , Logical reads: 74, , Block changes: 2, Physical reads: 2, Physical writes: User calls: Parses: Hard parses: Sorts: Logons: Executes: 2, Transactions:

31 AWR a SQL

32 DBA_HIST_WR_CONTROL SQL> col RETENTION format a25 SQL> col SNAP_INTERVAL format a25 SQL> select SNAP_INTERVAL, RETENTION, TOPNSQL from DBA_HIST_WR_CONTROL; SNAP_INTERVAL RETENTION TOPNSQL :00: :00:

33 DBMS_WORKLOAD_REPOSITORY MODIFY_SNAPSHOT_SETTINGS SQL> exec DBMS_WORKLOAD_REPOSITORY.MODIFY_SNAPSHOT_SETTINGS (RETENTION=>30*24*60, INTERVAL=>15); SQL> select SNAP_INTERVAL, RETENTION, TOPNSQL from DBA_HIST_WR_CONTROL; SNAP_INTERVAL RETENTION TOPNSQL :15: :00:

34 DBMS_WORKLOAD_REPOSITORY ADD_COLORED_SQL SQL> exec DBMS_WORKLOAD_REPOSITORY.ADD_COLORED_SQL(SQL_ID=>'xxxxxxxxxxxx x'); SQL> exec DBMS_WORKLOAD_REPOSITORY.REMOVE_COLORED_SQL(SQL_ID=>'xxxxxxxxx 34

35 select begin_interval_time, pr/sec "phy read / sec", lr/sec "log read / sec" from () BEGIN_INTERVAL_TIME phy read / sec log read / sec SEP

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37 DBWR checkpoint bytes DBWR checkpoint bytes

38 "Anomalies bug 38

39 select sql_id, round(pct*100,2), nvl("'on CPU'",0) "CPU from () pivot ( sum(round(cnt/totalsum*100,2)) for (wait_class) in (.. ) order by 2 desc SQL_ID PCT CPU SCHEDULER User I/O vur9dhsf7whh rrrjbqmjhc y81yfy7pu8z dqca4uwg467x n2ms1wttb1dh

40 SQL_ID PCT CPU SCHEDULER User I/O vur9dhsf7whh

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42 Używanie właściwej perspektywy w lokalizowaniu problemu Dopasowanie AWR do potrzeb częstotliwość / retencja Szukanie anomalii / trendów za pomocą widoków DBA_HIST

43 3 rd party products Free solution Simulating-ASH Scripts Snapper, MOATS, TopAAS, 43

44 Q & A 44