Statspack is a set of performance monitoring and reporting utilities provided by Oracle for Oracle8i and above. A user is automatically created by the installation script - this user, PERFSTAT, owns all objects needed by this package. For more information about Statspack, read the documentation in file $ORACLE_HOME/rdbms/admin/spdoc.txt. Install Statspack To install the package, either change to the ORACLE_HOME rdbms/admin directory, or fully specify the ORACLE_HOME/rdbms/admin directory when calling the installation script, SPCREATE. To run the installation script, you must use SQL*Plus and connect as a user with SYSDBA privilege. For example, start SQL*Plus, then: On UNIX : SunOS/HP UX/Linux SQL> CONNECT / AS SYSDBA SQL> @?/rdbms/admin/spcreate On Windows: XP/NT/2000/2003 SQL> CONNECT / AS SYSDBA SQL> @%ORACLE_HOME%rdbmsadminspcreate The SPCREATE install script runs three other scripts. These scripts are called automatically, so you do not need to run them: * SPCUSR: Creates the user and grants privileges * SPCTAB: Creates the tables * SPCPKG: Creates the package Configuring Statspack How to locate the current Ststapack level? - Look at table PERFSTST.STATS$SNAPSHOT or - Run spreport.sql and you will notice it alongwith the snapids listed STATS$SNAPSHOT will show level for each Snapshot recorded Change Level execute statspack.snap (i_snap_level=> 7, i_modify_parameter=>'true'); Levels >= 0 General Performance Statistics Levels >= 5 Additional Data: SQL Statements Levels >= 6 Additional Data: SQL Plans and SQL Plan Usage Levels >= 10 Additional Statistics: Parent and Child Latches Using Statspack (gathering data) sqlplus perfstat -- -- Take a performance snapshot -- execute statspack.snap; -- -- Get a list of snapshots -- column snap_time format a21 select snap_id,to_char(snap_time,'MON dd, yyyy hh24:mm:ss') snap_time from sp$snapshot; -- Running a Performance report -- -- Run the Statspack report: -- @?/rdbms/admin/spreport.sql Locate Hard hitting SQL from Statpack Reposistory 1. Login as PERFSTAT user on database. It won't work unless U login as PERFSTAT user. 2. Find DBID using "select dbid from stats$sql_summary" 3. Locate MIN(SNAP_ID) pBgnSnap & MAX(SNAP_ID) pEndSnap from select min(snap_id),max(snap_id),min(snap_time),max(snap_time) from stats$snapshot where to_number(to_char(snap_time,'HH24')) > 10 and to_number(to_char(snap_time,'HH24')) < 13 and trunc(snap_time)=trunc(sysdate) Show All SQL Stmts ordered by Logical Reads select e.hash_value "E.HASH_VALUE" , e.module "Module" , e.buffer_gets - nvl(b.buffer_gets,0) "Buffer Gets" , e.executions - nvl(b.executions,0) "Executions" , Round( decode ((e.executions - nvl(b.executions, 0)), 0, to_number(NULL) , (e.buffer_gets - nvl(b.buffer_gets,0)) / (e.executions - nvl(b.executions,0))) ,3) "Gets / Execution" , Round(100*(e.buffer_gets - nvl(b.buffer_gets,0))/sp920.getGets(:pDbID,:pInstNum,:pBgnSnap,:pEndSnap,'NO'),3) "Percent of Total" , Round((e.cpu_time - nvl(b.cpu_time,0))/1000000,3) "CPU (s)" , Round((e.elapsed_time - nvl(b.elapsed_time,0))/1000000,3) "Elapsed (s)" , Round(e.fetches - nvl(b.fetches,0)) "Fetches" , sp920.getSQLText ( e.hash_value , 400) "SQL Statement" from stats$sql_summary e , stats$sql_summary b where b.snap_id(+) = :pBgnSnap and b.dbid(+) = e.dbid and b.instance_number(+) = e.instance_number and b.hash_value(+) = e.hash_value and b.address(+) = e.address and b.text_subset(+) = e.text_subset and e.snap_id = :pEndSnap and e.dbid = :pDbId and e.instance_number = :pInstNum order by 3 desc Show SQL Stmts where SQL_TEXT like '%' select e.hash_value "E.HASH_VALUE" , e.module "Module" , e.buffer_gets - nvl(b.buffer_gets,0) "Buffer Gets" , e.executions - nvl(b.executions,0) "Executions" , Round( decode ((e.executions - nvl(b.executions, 0)), 0, to_number(NULL) , (e.buffer_gets - nvl(b.buffer_gets,0)) / (e.executions - nvl(b.executions,0))) ,3) "Gets / Execution" , Round(100*(e.buffer_gets - nvl(b.buffer_gets,0))/sp920.getGets(:pDbID,:pInstNum,:pBgnSnap,:pEndSnap,'NO'),3) "Percent of Total" , Round((e.cpu_time - nvl(b.cpu_time,0))/1000000,3) "CPU (s)" , Round((e.elapsed_time - nvl(b.elapsed_time,0))/1000000,3) "Elapsed (s)" , Round(e.fetches - nvl(b.fetches,0)) "Fetches" , sp920.getSQLText ( e.hash_value , 400) "SQL Statement" from stats$sql_summary e , stats$sql_summary b where b.snap_id(+) = :pBgnSnap and b.dbid(+) = e.dbid and b.instance_number(+) = e.instance_number and b.hash_value(+) = e.hash_value and b.address(+) = e.address and b.text_subset(+) = e.text_subset and e.snap_id = :pEndSnap and e.dbid = 2863128100 and e.instance_number = :pInstNum and sp920.getSQLText ( e.hash_value , 400) like '%ZPV_DATA%' order by 3 desc How to retrieve entire SQL + Execution PLAN from Statspack for a table To retrieve SQL plan you need to have statspack working on level 7 1. sprepsql.sql The SQL report (sprepsql.sql) is a report for a specific SQL statement. The SQL report is usually run after examining the high-load SQL sections of the instance health report.The SQL report provides detailed statistics and data for a single SQL statement (as identified by the Hash Value in Statspack report). 2. Hash Value is known - Select * from STATS$SQLTEXT where hash_value='%from stats pack%' order by piece; - For an Object first locate the OBJECT_ID select * from sys.obj$ where name='TRANSACTION' select snap_time snap_id, plan_hash_value, OBJECT# , OBJECT_NAME , OPERATION , OPTIONS , COST , IO_COST , CARDINALITY , POSITION , CPU_COST , OPTIMIZER , SEARCH_COLUMNS , BYTES , DISTRIBUTION , TEMP_SPACE , ACCESS_PREDICATES , FILTER_PREDICATES from stats$SQL_PLAN a , STATS$SNAPSHOT b where object#='&&OBJECT_ID' and a.snap_id=b.snap_id; http://OracleDbaSupport.co.uk is a blog site of Sagar Patil, an independent oracle consultant with a great understanding of how the Oracle database engine & Oracle Applications work together. I am an Oracle Certified RAC DBA with over ten years experience supporting Production and Development instances of Oracle databases. - Expert in building 10g RAC systems as well as rman, data guard backup and recovery strategies for production, test and development systems. - Instructor for developers on Oracle architecture, Oracle9i /10g features, tuning methodologies, database replication, PL/SQL and Oracle Http Server. - User of Statspack, SQL Trace, OEM Performance Manager, Quest Central, Quest Foglight, Quest SQL impact, Bennchamark factory, Quest SQL optimizer, TOAD and custom scripts. - Writer of detailed standards & practices for Oracle installs, upgrades, tuning & backups on Oracle Databases and PL/SQL.Developer, designer and implementer of Disaster recovery backup Procedures - Leader on major projects through all phases of development, testing and Support I can be hired on a short term notice, to handle strategy, design, implementation, trouble-shooting, DBA cover, remote monitoring, and training. Please visit www.oracledbasupport.co.uk for your oracle DBA needs.
