最近生产库上经常因为一些查询账号登陆数据仓库，做了大数据量查询，sql语句甚至不带条件，严重拖累了数据库性能，
因此我增加了resource manager限制这些查询账号的最大执行时间，以及cpu使用率，目的是降低这些账号查询对数据库正常业务的影响。
1.资源管理器创建的步骤：
Step 1: Create a pending area.
Step 2: Create, modify, or delete consumer groups.
Step 3: Create the resource plan.
Step 4: Create resource plan directives.
Step 5: Validate the pending area.
Step 6: Submit the pending area.
2.我的创建脚本
BEGIN
DBMS_RESOURCE_MANAGER.CREATE_PENDING_AREA();
/* Create consumer groups.
* By default, users start in OTHER_GROUPS, which is automatically
* created for every database.
*/
DBMS_RESOURCE_MANAGER.CREATE_CONSUMER_GROUP(
'MAIN_GROUP',
'rptdw main users group');
DBMS_RESOURCE_MANAGER.CREATE_CONSUMER_GROUP(
'QUERY_GROUP',
'using for query users ,limit parallel threads and cpu consume percentage');
/* Create a plan to manage these consumer groups */
DBMS_RESOURCE_MANAGER.CREATE_PLAN(
'RPTDW_PLAN',
'Plan for limit long-running queries and too many parallel querys');
DBMS_RESOURCE_MANAGER.CREATE_PLAN_DIRECTIVE(
'RPTDW_PLAN', 'OTHER_GROUPS', 'Directive for rptdw system users activity',
mgmt_p1 => 100);
DBMS_RESOURCE_MANAGER.CREATE_PLAN_DIRECTIVE(
'RPTDW_PLAN', 'QUERY_GROUP', 'Directive for query users activity',
mgmt_p2 => 80,
parallel_degree_limit_p1 => 2,
max_est_exec_time => 120);
DBMS_RESOURCE_MANAGER.VALIDATE_PENDING_AREA();
DBMS_RESOURCE_MANAGER.SUBMIT_PENDING_AREA();
END;
/
3.如果中间报错，需要清空悬挂区。
BEGIN
DBMS_RESOURCE_MANAGER.CLEAR_PENDING_AREA();
END;
/
4,到所有RAC的节点用sys用户执行，让资源管理器计划生效。
ALTER SYSTEM SET RESOURCE_MANAGER_PLAN = rptdw_plan ;
5.我想把以下数据库账号加入新建的资源计划的QUERY_GROUP消费组
SUPPORT
FROMBI
MAIN1
MAIN4
MAIN_DBA
MREAD_Q
OPS$MON
BOCO4A
REPORT1
-- 是否有必要？
BEGIN
DBMS_RESOURCE_MANAGER.CREATE_PENDING_AREA();
DBMS_RESOURCE_MANAGER.SET_CONSUMER_GROUP_MAPPING(DBMS_RESOURCE_MANAGER.ORACLE_USER, 'SUPPORT', 'QUERY_GROUP');
DBMS_RESOURCE_MANAGER.SET_CONSUMER_GROUP_MAPPING(DBMS_RESOURCE_MANAGER.ORACLE_USER, 'FROMBI', 'QUERY_GROUP');
DBMS_RESOURCE_MANAGER.SET_CONSUMER_GROUP_MAPPING(DBMS_RESOURCE_MANAGER.ORACLE_USER, 'MAIN1', 'QUERY_GROUP');
DBMS_RESOURCE_MANAGER.SET_CONSUMER_GROUP_MAPPING(DBMS_RESOURCE_MANAGER.ORACLE_USER, 'MAIN4', 'QUERY_GROUP');
DBMS_RESOURCE_MANAGER.SET_CONSUMER_GROUP_MAPPING(DBMS_RESOURCE_MANAGER.ORACLE_USER, 'MAIN_DBA', 'QUERY_GROUP');
DBMS_RESOURCE_MANAGER.SET_CONSUMER_GROUP_MAPPING(DBMS_RESOURCE_MANAGER.ORACLE_USER, 'MREAD_Q', 'QUERY_GROUP');
DBMS_RESOURCE_MANAGER.SET_CONSUMER_GROUP_MAPPING(DBMS_RESOURCE_MANAGER.ORACLE_USER, 'OPS$MON', 'QUERY_GROUP');
DBMS_RESOURCE_MANAGER.SET_CONSUMER_GROUP_MAPPING(DBMS_RESOURCE_MANAGER.ORACLE_USER, 'BOCO4A', 'QUERY_GROUP');
DBMS_RESOURCE_MANAGER.SET_CONSUMER_GROUP_MAPPING(DBMS_RESOURCE_MANAGER.ORACLE_USER, 'MAIN2', 'QUERY_GROUP');
DBMS_RESOURCE_MANAGER.VALIDATE_PENDING_AREA();
DBMS_RESOURCE_MANAGER.SUBMIT_PENDING_AREA();
END;
/
执行成功
PL/SQL procedure successfully completed
我想把其他数据库账号加入消费组OTHER_GROUPS
DET
BEGIN
DBMS_RESOURCE_MANAGER.CREATE_PENDING_AREA();
DBMS_RESOURCE_MANAGER.SET_CONSUMER_GROUP_MAPPING(DBMS_RESOURCE_MANAGER.ORACLE_USER, 'DET', 'OTHER_GROUPS');
DBMS_RESOURCE_MANAGER.VALIDATE_PENDING_AREA();
DBMS_RESOURCE_MANAGER.SUBMIT_PENDING_AREA();
END;
/
报错：
ERROR at line 1:
ORA-29396: cannot switch group to OTHER_GROUPS
ORA-06512: at "SYS.DBMS_RMIN", line 302
ORA-06512: at "SYS.DBMS_RESOURCE_MANAGER", line 709
ORA-06512: at line 3
注意，无法把数据库用户映射到OTHER_GROUPS，OTHER_GROUPS相当于默认组
6.给账号分配权限，然后修改这些账号的初始化的消费者组
begin
dbms_resource_manager_privs.grant_system_privilege(grantee_name=>'MAIN2',admin_option=>true);
end;
/
begin
dbms_resource_manager_privs.grant_switch_consumer_group(grantee_name =>'SUPPORT',consumer_group =>'QUERY_GROUP',grant_option => false);
dbms_resource_manager_privs.grant_switch_consumer_group(grantee_name =>'FROMBI',consumer_group =>'QUERY_GROUP',grant_option => false);
dbms_resource_manager_privs.grant_switch_consumer_group(grantee_name =>'MAIN1',consumer_group =>'QUERY_GROUP',grant_option => false);
dbms_resource_manager_privs.grant_switch_consumer_group(grantee_name =>'MAIN4',consumer_group =>'QUERY_GROUP',grant_option => false);
dbms_resource_manager_privs.grant_switch_consumer_group(grantee_name =>'MAIN_DBA',consumer_group =>'QUERY_GROUP',grant_option => false);
dbms_resource_manager_privs.grant_switch_consumer_group(grantee_name =>'MREAD_Q',consumer_group =>'QUERY_GROUP',grant_option => false);
dbms_resource_manager_privs.grant_switch_consumer_group(grantee_name =>'OPS$MON',consumer_group =>'QUERY_GROUP',grant_option => false);
dbms_resource_manager_privs.grant_switch_consumer_group(grantee_name =>'BOCO4A',consumer_group =>'QUERY_GROUP',grant_option => false);
dbms_resource_manager_privs.grant_switch_consumer_group(grantee_name =>'MAIN2',consumer_group =>'QUERY_GROUP',grant_option => false);
end;
/
begin
DBMS_RESOURCE_MANAGER.set_initial_consumer_group('SUPPORT','QUERY_GROUP');
DBMS_RESOURCE_MANAGER.set_initial_consumer_group('FROMBI','QUERY_GROUP');
DBMS_RESOURCE_MANAGER.set_initial_consumer_group('MAIN1','QUERY_GROUP');
DBMS_RESOURCE_MANAGER.set_initial_consumer_group('MAIN4','QUERY_GROUP');
DBMS_RESOURCE_MANAGER.set_initial_consumer_group('MAIN_DBA','QUERY_GROUP');
DBMS_RESOURCE_MANAGER.set_initial_consumer_group('MREAD_Q','QUERY_GROUP');
DBMS_RESOURCE_MANAGER.set_initial_consumer_group('OPS$MON','QUERY_GROUP');
DBMS_RESOURCE_MANAGER.set_initial_consumer_group('BOCO4A','QUERY_GROUP');
DBMS_RESOURCE_MANAGER.set_initial_consumer_group('MAIN2','QUERY_GROUP');
end;
/
7.回头看了最大执行时间2分钟，感觉太少了，修改消费组QUERY_GROUP的计划指导
BEGIN
DBMS_RESOURCE_MANAGER.CLEAR_PENDING_AREA();
DBMS_RESOURCE_MANAGER.CREATE_PENDING_AREA();
DBMS_RESOURCE_MANAGER.update_plan_directive(
PLAN => 'RPTDW_PLAN',
GROUP_OR_SUBPLAN => 'QUERY_GROUP',
new_max_est_exec_time => 1800
);
DBMS_RESOURCE_MANAGER.SUBMIT_PENDING_AREA();
END;
/
8.测试一下
用限制账号main2登陆，执行
select count(*) from report1.T_F_USERVISIT_PLT
报错:
ORA-07455: 估计执行时间（119039秒）超出了限制（1800秒）
资源管理器生效。
9.资源管理器的两个包
SYS.dbms_resource_manager
SYS.dbms_resource_manager_privs
相关视图：
select * from V$RSRC_PLAN ;
select * from V$RSRC_CONSUMER_GROUP ;
select * from V$RSRC_SESSION_INFO ;
select * from V$RSRC_PLAN_HISTORY ;
select * from V$RSRC_CONS_GROUP_HISTORY ;
select * from V$RSRCMGRMETRIC ;
select * from V$RSRCMGRMETRIC_HISTORY ;
SELECT plan,status,comments FROM dba_rsrc_plans;
SELECT sid,serial#,username,resource_consumer_group FROM gv$session;
SELECT sid,serial#,username,resource_consumer_group FROM gv$session where resource_consumer_group='QUERY_GROUP' ;
select * from dba_rsrc_plans ;
select * from dba_rsrc_consumer_groups ;
select * from dba_rsrc_plan_directives t where t.plan='RPTDW_PLAN';
select * from dba_rsrc_group_mappings ;