oracle数据库CPU过高问题举例分析
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一、环境准备
1、查看当前快照情况
SQL> select max(snap_id) from dba_hist_snapshot s; 28
2、手工生成一份快照
exec dbms_workload_repository.create_snapshot;
3、创建实验表
SQL> create sequence s_t3_id minvalue 1 maxvalue 9999999999 start with 1 increment by 1 cache 20 order; SQL> create table t3 (id number,name varchar2(20),created date); Table created. SQL> begin 2 for i in 1 .. 5000000 loop 3 insert into t3 values (s_t3_id.Nextval,dbms_random.string('u', 10),sysdate); 4 end loop; 5 end; 6 / SQL> create sequence s_t4_id minvalue 1 maxvalue 9999999999 start with 1 increment by 1 cache 20 order; SQL> create table t4 (id number,name varchar2(20),created date); Table created. SQL> begin 2 for i in 1 .. 3000000 loop 3 insert into t4 values (s_t4_id.Nextval,dbms_random.string('u', 10),sysdate); 4 end loop; 5 end; 6 / SQL> select * from scott.t3 where name=dbms_random.string('u', 10); no rows selected SQL> select * from scott.t4 where name=dbms_random.string('u', 10); no rows selected
4、手工生成快照
exec dbms_workload_repository.create_snapshot;
至此,模拟问题出现时的快照区间为29-30
二、使用SPA进行分析
begin 2 dbms_sqltune.create_sqlset( 3 sqlset_name=>'cpu_test', 4 description => 'High cpu read tuning set'); 5 end; 6 / PL/SQL procedure successfully completed. SQL> declare 2 base_cur dbms_sqltune.sqlset_cursor; 3 begin 4 open base_cur for 5 select value(x) from table(DBMS_SQLTUNE.select_workload_repository(29,30,NULL,NULL,'cpu_time',NULL,NULL,NULL,10)) x; 6 -- 7 dbms_sqltune.load_sqlset(sqlset_name=>'cpu_test',populate_cursor => base_cur); 8 end; 9 / PL/SQL procedure successfully completed. SQL> variable sts_task VARCHAR2(64); SQL> EXEC :sts_task :=DBMS_SQLPA.CREATE_ANALYSIS_TASK(sqlset_name=>'cpu_test',order_by=>'cpu_time',description=>'process workload ordered by cpu_time'); PL/SQL procedure successfully completed. SQL> EXEC DBMS_SQLPA.execute_analysis_task(task_name=>:sts_task,execution_params=>dbms_advisor.arglist('TIME_LIMIT','1800')); PL/SQL procedure successfully completed. SQL> set serveroutput on SQL> set heading off SQL> set pagesize 2000 SQL> set long 20000 SQL> spool compare_report.html SQL> select DBMS_SQLPA.report_analysis_task(:sts_task,'HTML','ALL','ALL') from dual; SQL> spool off
查看生产的HTML文件,可看到时间范围内运行的所有sql的信息
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