Performance Tuning Tool01-Statspack
0 likes392 views
Statspack is a collection of scripts that capture and report performance data from Oracle databases by taking snapshots and creating reports for performance tuning. It includes functionalities to create and manage baselines, execute snapshots, and generate reports on various performance metrics. The document provides detailed instructions on setting up, managing, and utilizing Statspack for database performance analysis.
Performance Tuning Tool01-Statspack
- 1. Statspack 1. 1. Statspack; 2. Statspack ; 3. Statspack ; 4. Statspack ; 2. Statspack : 1. 8i ; 2. Statspack AWR , , AWR; 3. Statspack is a set of scripts that capture and report on performance data from within the Oracle database; 4. Statspack : 1. Capture instance data by taking a "snapshot"; 2. Store snapshot data in the database in a separate schema; 3. Create reports between two snapshots; 4. Mark snapshots as baseline information; 5. Use the reports as part of a performance tuning method; 5. Statspack : 1. spcreate.sql: Statspack; 2. statspack.snap: ; 3. spauto.sql: , alter system set job_queue_processes = 5 ; 4. spreport.sql/sprepsql.sql: ; 5. statspack.purge/sppurge.sql: ; 6. sptrunc.sql: Statspack ; 7. spdrop.sql: Statspack ; 8. spexp.par: Statspack ; 3. Statspack: 1. , statspack :CREATE TABLESPACE statspack DATAFILE '+DATA' SIZE 500M AUTOEXTEND ON EXTENT MANAGEMENT LOCAL; 2. sysdba :sqlplus / as sysdba; 3. PERFSTAT :define perfstat_password='oracle'; 4. PERFSTAT :define default_tablespace='statspack'; 5. PERFSTAT :define temporary_tablespace='temp'; 6. Statspack:@?/rdbms/admin/spcreate.sql; 7. :host ls *.lis; spdrop.sql , ; 8. PERFSTAT ,Statspack ;( , ) 4. Statspack : 1. :execute statspack.snap; 2. : 3. , : 5. : 1. : 1. 0:General Performance; 2. 5:SQL statments; 3. 6:SQL plans and SQL plan usage; 4. 7:Segment-level statistics, v$segment_statistics , :SELECT owner, object_name FROM v$segment_statistics WHERE statistic_name = 'buffer busy waits' ORDER BY VALUE DESC; 5. 10:Parent and child latches, ; 2. :SELECT snap_level FROM perfstat.stats$statspack_parameter; 3. :execute statspack.snap(i_snap_level=>6); 4. , :execute statspack.snap(i_snap_level=>10, i_modify_parameter=>'true'); 5. / ( ):execute statspack.modify_statspack_parameter(i_snap_level=>7); 6. session , session_id=3 :execute statspack.snap(i_session_id=>3); 6. / Statspack Baselines : 1. ( , i_snap_range=false, ture):exec statspack.make_baseline(i_begin_snap=>2, i_end_snap=>5, i_snap_range=>true); 2. :exec statspack.make_baseline(i_begin_date=>to_date('2012- 05-01 12:00:00', 'YYYY-MM-DD HH24:MI:SS'), i_begin_date=>to_date('2012-05-02 12:00:00', 'YYYY-MM-DD HH24:MI:SS')); 3. , ( , , i_snap_range=false):statspack.clear_baseline(i_begin_snap=>2, i_end_snap=>5, i_snap_range=>true); 4. :exec statspack.clear_baseline(i_begin_date=>to_date('2012-05- 01 12:00:00', 'YYYY-MM-DD HH24:MI:SS'), i_begin_date=>to_date('2012-05-02 12:00:00', 'YYYY-MM-DD HH24:MI:SS')); 5. exec statspack.purge(); ; 6. baseline , purge baseline baseline snap, clear baseline; 7. Statspack : 1. perfstat :conn perfstat/oracle; 2. , : 1. :define begin_snap=1; 2. :define end_snap=4; 3. :define report_name=spreport; 3. :@?/rdbms/admin/spreport.sql; 4. :host ls spreport.lst; 8. Statspack : 1. STATISICS_LEVEL=TYPICAL; 2. TIMED_STATISTICS=TRUE ; 3. Statspack AWR , AWR; 4. , 1 , , ###### ; 5. PREFSTAT ; 9. Statspack : 1. : 1. Load Profile(useful with baseline); 2. Instance Efficiency(useful with baseline); 3. Top 5 Timed Events; 4. Time Model; 5. Wait Events and Background Wait Events; 6. Wait Event Histogram(only in Statspack); 2. ,: 1. CONT:Block contention; 2. CPU:CPU consumption; 1. Host CPU; 2. Instance CPU; 3. SQL ordered by CPU; 4. SQL ordered by Gets; 3. LC:Library cache; 1. Shared Pool Statistics; 2. SQL ordered by Parse Calls; 4. MEM:Memory consumption; 1. Virtual Memory Paging; 5. ENQ:Enqueue; 6. IO:I/O consumption; 1. SQL ordered by Elapsed; 2. SQL ordered by Reads; 7. LAT:Latch contention; 8. PGAM:PGA memory consumption; 9. RBS:Rollback segment; 10. UNDO:Automatic undo; 11. SP:Shared pool; ------------------- Statspack ------------------- -- 1. , ; 1. ORCL, 10.2.0.1.0; 2. , 1.67 ; -- 2. , , , baseline ; 1.Redo size: ( ), ; 2.Logical reads: ( block); 3.block changes: block , , 1:4(13.51:57.68), OLTP ; 4.Physical reads: block , Logica reads , Physical Reads , Buffer Cache , ; 5.Physical writes: block , , ; 6.User calls: ; 7.Parses: sql ( ), CPU ; 100 /s , 300 /s ; 8.Hard parses: , (1 - hard prases/parses)*100%, 95% , session_cached_cursors ; 9.Sorts: , ; 10.Logons: , , session ; 11.Executes: , , baseline ; 12.Transactions: , ; 13.Blocks changed per Read: 23.42%; 14.Recursive Call: PL/SQL , ; ; 15.Rollback per transaction: , undo , , ; -- 3. , , 100%; 1.Buffer Nowait: 99%, ; 2.Buffer Hit: 99%, , , IO ; 3.Library Hit: 95%, sql ( , ); 4.Soft Parse: 95%, 80% sql , Load Profile ; 5.Latch Hit: 95% ; 6.Execute to Parse: SQL , SQL , , session , 0. , session , SQL SQL ; 7.Parse CPU to Parse Elapsd: CPU 100/102.56 ; 100%, CPU SQL , ; 100%, CPU , ; 8.Non-Parse CPU , round(100*(1- parse_cpu/tot_cpu),2). parse_cpu , tot_cpu , 100%, , , ; 9.Memory Usage: , 75% 90%; , ; , , SQL ; 10.Sql with executions > 1: 1 SQL , ; 11.Memory for SQL w/exec>1: SQL , SQL , 1 SQL , ; -- 4. 5 , ; 1. CPU time , DB CPU; 2.DB file scatter read: , ; , , , ( ); 3.DB file sequential read: ( , ); , ;DB_CACHE_SIZE , ; PGA , , ; ; 4.Buffer busy wait: , , ; 1 , ; 5.Latch free: , (SGA) , ; 6.Enqueue: , ; , , , , ; 7.Logfile Switch: ( ) ; 8.Log buffer space: , ; 9.Log file sync: session ,session , LGWR redo entry redo log file, redo log file , session, 10.LGRW ; : , ; 11.Ldle event: ; -- 5.CPU ( ); 1. CPU 88.78%, 4.07%, 5.44; 2. CPU 5.44%*4.98%, CPU 5.44%*4.98%*44.41%; -- 6. , v$sys_time_model ; -- 7. / ; 1. :s- ;cs-1/100s;ms-1/1000s;us-1/1000000s; 2. SQL*Net , , , ; -- 8: sql ; 1. sql , , SQL , ; 2. SQL SQL , SQL : 1. SQL , SQL , schema user1 select * from t; schema user2 select * from t; SQL , schema , ; 2. , ; 3. , SQL 10, SQL 50, SQL ; 4. SQL ; -- 9. , PGA ; 1. , pga_aggregate_target=96 100% ; 2. V$PGA_TARGET_ADVICE ; -- 10. , , ; ------------------- Statspack -------------------