Merge branch 'master' of https://github.com/oracle/oracle-db-examples

Author: Dan McGhan

optimizer/faster_stats/DEFAULT/modify_plan.sql

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+--
+-- This modifies the default maintenance resource
+-- management plan as described in the blog
+-- post. 
+--
+connect / as sysdba
+
+exec dbms_resource_manager.clear_pending_area
+
+begin
+  dbms_resource_manager.create_pending_area();
+  dbms_resource_manager.update_plan_directive(
+        plan                         => 'DEFAULT_MAINTENANCE_PLAN',
+        group_or_subplan             => 'ORA$AUTOTASK',
+        new_mgmt_p1                  => 5,
+        new_max_utilization_limit    => 90,
+        new_parallel_degree_limit_p1 => 4);
+  dbms_resource_manager.update_plan_directive(
+        plan                         => 'DEFAULT_MAINTENANCE_PLAN',
+        group_or_subplan             => 'OTHER_GROUPS',
+        new_mgmt_p1                  => 20);
+  dbms_resource_manager.update_plan_directive(
+        plan                         => 'DEFAULT_MAINTENANCE_PLAN',
+        group_or_subplan             => 'SYS_GROUP',
+        new_mgmt_p1                  => 75);
+  dbms_resource_manager.validate_pending_area();
+  dbms_resource_manager.submit_pending_area();
+end;
+/
+

optimizer/faster_stats/DEFAULT/run_gather.sql

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+--
+-- This starts a batch window to execute auto stats
+-- immediately. In this case we are just using
+-- the default maintenance plan.
+--
+begin
+  begin
+    dbms_scheduler.drop_window('TEST_WINDOW',true);
+  exception when others then
+    if (sqlcode != -27476) then
+      raise;
+    end if;
+  end;
+
+  dbms_scheduler.create_window(
+    window_name     => 'TEST_WINDOW',
+    duration        =>  numtodsinterval(20, 'minute'),
+    resource_plan   => 'DEFAULT_MAINTENANCE_PLAN',
+    repeat_interval => 'FREQ=DAILY;INTERVAL=1');
+  dbms_scheduler.add_group_member(
+    group_name  => 'MAINTENANCE_WINDOW_GROUP',
+    member      => 'TEST_WINDOW');
+  dbms_scheduler.enable(name => 'TEST_WINDOW');
+  dbms_auto_task_admin.enable('auto optimizer stats collection',NULL,
+                              'TEST_WINDOW');
+--dbms_auto_task_admin.enable('sql tuning advisor',NULL,
+--                            'TEST_WINDOW');
+--dbms_auto_task_admin.enable('auto space advisor',NULL,
+--                            'TEST_WINDOW');
+end;
+/
+
+

optimizer/faster_stats/README.md

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+
+
+First, create a user called STEST by adapting the the user.sql script to use an appropriate tablespace (which needs to have about 1.5GB free).
+
+Two 'connect' scripts are available:
+cadm.sql      <-- Connects to SYSDBA account
+cusr.sql      <-- Connects to the STEST user account
+You can edit these to suit you system, particularly if you are using a multitenant environment.
+
+Create tables: 
+@tabs.sql
+
+Gather database stats to start with a 'clean slate': 
+@gather.sql
+
+Make RM plan: 
+@make_plan.sql 
+Note that SCOPE=MEMORY so the plan change is temporary.
+If necessary, you can drop the plan with drop_plan.sql
+
+If you want to use the DEFAULT_MAINTENANCE_PLAN instead, 
+run modify_plan.sql in the 'DEFAULT' directory.
+
+To use AUTO_DEGREE: @auto.sql
+To use serial execution: @noauto.sql
+
+To user CONCURRENT: @conc.sql
+To disable CONCURRENT: @noconc.sql
+
+Prepare the test by dripping stats on the test tables: 
+@drop_stats.sql
+
+Initiate stats gathering by creating a 20min batch window: 
+@run_gather.sql
+If you want to use DEFAULT_MAINTENANCE_PLAN, then run 'run_gather.sql' in
+the 'DEFAULT' subdirectory instead.
+
+I have put the monitoring queries I use in util.sql 
+Take a look at scheduler information: get_status.sql
+Take a look at stale objects: stale.sql
+
+If you want to stop the test: drop_window.sql  [stop.sql is an alternative]
+
+========================
+
+You can run a manual stats gathering with 'manual.sql'

optimizer/faster_stats/auto.sql

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+@cusr
+set serveroutput on
+
+declare
+  cursor c1 is
+    select table_name
+    from   user_tables
+    where table_name like 'BIGT%';
+begin
+  for r in c1
+  loop
+     dbms_stats.set_table_prefs(user,r.table_name,'degree',DBMS_STATS.AUTO_DEGREE);
+     dbms_output.put_line('Auto: '||r.table_name);
+  end loop;
+end;
+/

optimizer/faster_stats/cadm.sql

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+connect / as sysdba

optimizer/faster_stats/conc.sql

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+--
+-- Enable concurrent collection for auto optimizer stats collection
+--
+@cadm
+
+exec dbms_stats.set_global_prefs('CONCURRENT','AUTOMATIC')
+
+select dbms_stats.get_prefs('CONCURRENT') from dual;
+

optimizer/faster_stats/concm.sql

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+--
+-- Enable concurrent collection for auto optimizer stats collection
+--
+@cadm
+
+exec dbms_stats.set_global_prefs('CONCURRENT','MANUAL')
+
+select dbms_stats.get_prefs('CONCURRENT') from dual;
+

optimizer/faster_stats/cusr.sql

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+connect stest/stest

optimizer/faster_stats/drop_plan.sql

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+--
+-- Drop the test RM plan
+--
+@cadm
+
+ALTER SYSTEM SET RESOURCE_MANAGER_PLAN = '' scope = memory;
+
+declare
+  plan_exists exception;
+  pragma exception_init (plan_exists,-29358); 
+begin
+  dbms_resource_manager.create_pending_area();
+  dbms_resource_manager.delete_plan('DB_RM_PLAN');
+  dbms_resource_manager.submit_pending_area();
+  exception 
+     when plan_exists then null;
+end;
+/
+

optimizer/faster_stats/drop_stats.sql

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+@cusr
+set serveroutput on
+
+declare
+  cursor c1 is
+    select table_name
+    from   user_tables
+    where table_name like 'BIGT%';
+begin
+  for r in c1
+  loop
+     dbms_stats.delete_table_stats(user,r.table_name);
+     dbms_output.put_line('Drop Stats: '||r.table_name);
+  end loop;
+end;
+/
+
+@stats