How to Recreate The AWR( AUTOMATIC WORK LOAD ) Repository

The best way to deinstall/install AWR is as follows:

1. Disable AWR statistics gathering by setting the statistics level to basic as follows:

Check settings for parameters as follows:

sqlplus /nolog

connect / as sysdba

show parameter cluster_database

show parameter statistics_level

show parameter sga_target

Or

save the spfile before modifying:

create pfile='/home/oracle/admin/dbs/init_bkp.ora ' from spfile;

 

In 10g and 11g , if  sga_target is not 0, then in pfile or spfile set the following parameters:

The example below refers to spfile:

alter system set shared_pool_size = 200m scope = spfile;

alter system set db_cache_size = 300m scope = spfile;

alter system set java_pool_size = 100 scope = spfile;

alter system set large_pool_size = 50 scope = spfile;

alter system reset sga_target scope= spfile;

alter system reset memory_target scope= spfile; 

alter system reset memory_max_target scope=spfile;

alter system set statistics_level=basic scope=spfile;

-- Setting the parameter cluster_database only applicable

-- in RAC environment

alter system set cluster_database = false scope = spfile;

In 11g, you may need to set both SGA_TARGET and MEMORY_TARGET to 0:

alter system set sga_target=0 scope= spfile;

alter system set memory_target=0 scope= spfile;

 

otherwise database may not startup and will fail with the errors below:

SQL> startup restrict

ORA-01078: failure in processing system parameters

ORA-00824: cannot set SGA_TARGET or MEMORY_TARGET due to existing internal settings

ORA-00848: STATISTICS_LEVEL cannot be set to BASIC with SGA_TARGET or MEMORY_TARGET 

2. Shutdown database and startup in restrict mode so that no transactions will occur while dropping the AWR repository:   

sqlplus /nolog

connect / as sysdba

shutdown immediate

startup restrict

3. Drop and recreate the AWR objects 

The following scripts drop AWR tables and then recreates them.

After recreating ,utlrp is run in order to validate all views and objects dependent on the AWR tables.

-- On both 10g and 11g

sql> ?/rdbms/admin/catnoawr.sql

sql>alter system flush shared_pool;

sql>start ?/rdbms/admin/catawrtb.sql

sql>start ?/rdbms/admin/utlrp.sql

--On 11g it is necessary to also run:

sql>start ?/rdbms/admin/execsvrm.sql

Check to see if all the objects are dropped after running catnoawr.sql

SQL> select table_name from dba_tables where table_name like 'WRM$_%' or table_name like 'WRH$_%';

If there are still objects after running catnoawr.sql, drop them manually:  

drop type AWR_OBJECT_INFO_TABLE_TYPE;

drop type AWR_OBJECT_INFO_TYPE;

drop table WRH$_PLAN_OPERATION_NAME;

drop table WRH$_PLAN_OPTION_NAME;

drop table WRH$_MV_PARAMETER;

drop table WRH$_MV_PARAMETER_BL;

drop table WRH$_DYN_REMASTER_STATS;

drop table WRH$_PERSISTENT_QMN_CACHE;

drop table WRH$_DISPATCHER;

drop table WRH$_SHARED_SERVER_SUMMARY;

drop table WRM$_WR_USAGE

drop table WRM$_SNAPSHOT_DETAILS

 If following errors occur, then recompile the objects:

 sql> ?/rdbms/admin/execsvrm.sql

Fails with the following errors :

ERROR at line 1:

ORA-04068: existing state of packages has been discarded

ORA-04061: existing state of package body "SYS.DBMS_SWRF_INTERNAL" has been  invalidated

 

 Compile again the package dbms_swrf_internal even if the objects appear valid:

alter package dbms_swrf_internal compile;

alter package dbms_swrf_internal compile body;

4)   Reset the parameters shared_pool_size,db_cache_size, java_pool_size ,large_pool_size, sga_target  statistics_level and cluster_database to original values.Also can reset the parameter from copy of the spfile:

create spfile from pfile='/home/oracle/admin/dbs/init_bkp.ora' ;   

 5) Restart instance in normal mode:

    sqlplus /nolog

    connect / as sysdba

    shutdown immediate

    startup

6) Check invalid objects exists are not , if exists then please compile it manually

     As we have run utlrp.sql, any invalid objects should already have been reported there

spool objects.lst

set pagesize500

set linesize 100

select substr(comp_name,1,40) comp_name, status, substr(version,1,10) version

from dba_registry  order by comp_name;

select substr(object_name,1,40) object_name,substr(owner,1,15) owner,object_type

from dba_objects  where status='INVALID' order by owner,object_type;

select owner,object_type,count(*)  from dba_objects

where status='INVALID'  group by owner,object_type order by owner,object_type ;

spool off

alter package <schema name>.<package_name> compile;

alter package <schema name>.<package_name> compile body;

alter view <schema name>.<view_name> compile;

alter trigger <schema).<trigger_name> compile;

7) To take the AWR snapshots:

exec dbms_workload_repository.create_snapshot;

--wait for 5 min

exec dbms_workload_repository.create_snapshot;

8) To create  AWR report run the script:

start $ORACLE_HOME/rdbms/admin/awrrpt.sql

9) If further assistance is needed or errors arise while performing recreation of AWR, please open an SR with oracle support.