DB2負載管理(WLM)(二)

與前一測試不同之處在於,在影射DML操作到服務類時,根據估計成本進行調整。

1,建立服務類,層次關係如下:
------------WLM_TIERS
--    +----------+-----------+
--    |          |           |
--WLM_SHORT  WLM_MEDIUM  WLM_LONG

-- Create service superclass WLM_TIERS
CREATE SERVICE CLASS WLM_TIERS@

-- Create service subclasses WLM_SHORT, WLM_MEDIUM, WLM_LONG
CREATE SERVICE CLASS WLM_SHORT UNDER WLM_TIERS@

CREATE SERVICE CLASS WLM_MEDIUM UNDER WLM_TIERS@

CREATE SERVICE CLASS WLM_LONG UNDER WLM_TIERS@

2,建立服務類重新影射閾值
--WLM_SHORT --&gt WLM_MEDIUM --&gt WLM_LONG
-- Create thresholds to remap activities from WLM_SHORT to WLM_MEDIUM
-- to WLM_LONG service subclasses based on processor time used in service class
CREATE THRESHOLD WLM_TIERS_REMAP_SHORT_TO_MEDIUM FOR
  SERVICE CLASS WLM_SHORT UNDER WLM_TIERS ACTIVITIES
  ENFORCEMENT DATABASE PARTITION WHEN
  CPUTIMEINSC > 10 SECONDS CHECKING EVERY 5 SECONDS
  REMAP ACTIVITY TO WLM_MEDIUM@

CREATE THRESHOLD WLM_TIERS_REMAP_MEDIUM_TO_LONG FOR
  SERVICE CLASS WLM_MEDIUM UNDER WLM_TIERS ACTIVITIES
  ENFORCEMENT DATABASE PARTITION WHEN
  CPUTIMEINSC > 10 SECONDS CHECKING EVERY 5 SECONDS
  REMAP ACTIVITY TO WLM_LONG@

-- Create work class set WLM_TIERS_WCS
CREATE WORK CLASS SET WLM_TIERS_WCS
  ( WORK CLASS WLM_SHORT_DML_WC WORK TYPE DML,
    WORK CLASS WLM_MEDIUM_DML_WC WORK TYPE DML,
    WORK CLASS WLM_LONG_DML_WC WORK TYPE DML,
    WORK CLASS WLM_CALL_WC WORK TYPE CALL,
    WORK CLASS WLM_OTHER_WC WORK TYPE ALL)@

3,建立工作類集,工作動作集

-- Create work action set WLM_TIERS_WAS to map activities grouped under
-- each work class in work class set WLM_TIERS_WCS to the corresponding
-- service subclass.
CREATE WORK ACTION SET WLM_TIERS_WAS FOR SERVICE CLASS WLM_TIERS
  USING WORK CLASS SET WLM_TIERS_WCS
  ( WORK ACTION WLM_SHORT_DML_WA ON WORK CLASS WLM_SHORT_DML_WC
      MAP ACTIVITY TO WLM_SHORT,
    WORK ACTION WLM_MEDIUM_DML_WA ON WORK CLASS WLM_MEDIUM_DML_WC
      MAP ACTIVITY TO WLM_MEDIUM,
    WORK ACTION WLM_LONG_DML_WA ON WORK CLASS WLM_LONG_DML_WC
      MAP ACTIVITY TO WLM_LONG,
    WORK ACTION WLM_CALL_WA ON WORK CLASS WLM_CALL_WC
      MAP ACTIVITY TO WLM_SHORT,
    WORK ACTION WLM_OTHER_WA ON WORK CLASS WLM_OTHER_WC
      MAP ACTIVITY TO WLM_MEDIUM )@

4,設定不同服務類代理優先順序

-- Create a stored procedure to determine operating system and to set service
-- class agent priorities. The operating system must be determined before
-- setting agent priority because the range of values for agent
-- priority differs between Windows and UNIX operating systems.
CREATE PROCEDURE checkPlatformAndSetAgentPriority()
  LANGUAGE SQL
  --------------------------------------------------------
  -- SQL Stored Procedure checkPlatformAndSetAgentPriority
  --------------------------------------------------------
  BEGIN

    DECLARE isWindows VARCHAR(256);
    DECLARE stmt VARCHAR(300);

    SELECT os_name INTO isWindows
      FROM SYSIBMADM.ENV_SYS_INFO
      WHERE UCASE(os_name) LIKE '%WIN%' OR UCASE(os_name) LIKE '%NT%';

    -- *PROPERTY* (UNIX) Set agent priority for service classes on UNIX
    -- operating systems. A lower numeric value means higher priority. A higher
    -- numeric value means lower priority. The valid range for agent priority on
    -- UNIX is -20 to 20.
    IF isWindows IS NULL
      THEN
        SET stmt = 'ALTER SERVICE CLASS WLM_SHORT UNDER WLM_TIERS AGENT PRIORITY -10';
        PREPARE s1 FROM stmt;
        EXECUTE s1;
        COMMIT;

        SET stmt = 'ALTER SERVICE CLASS WLM_MEDIUM UNDER WLM_TIERS AGENT PRIORITY 0';
        PREPARE s1 FROM stmt;
        EXECUTE s1;
        COMMIT;

        SET stmt = 'ALTER SERVICE CLASS WLM_LONG UNDER WLM_TIERS AGENT PRIORITY 10';
        PREPARE s1 FROM stmt;
        EXECUTE s1;
        COMMIT;

        SET stmt = 'ALTER SERVICE CLASS SYSDEFAULTSYSTEMCLASS AGENT PRIORITY -15 ';
        PREPARE s1 FROM stmt;
        EXECUTE s1;
        COMMIT;

        SET stmt = 'ALTER SERVICE CLASS SYSDEFAULTMAINTENANCECLASS AGENT PRIORITY 15';
        PREPARE s1 FROM stmt;
        EXECUTE s1;
        COMMIT;

    -- #PROPERTY# (Windows) Set agent priority for service classes on Windows
    -- operating systems. A higher numeric value means higher priority. A lower
    -- numeric value means lower priority. The valid range for agent priority on
    -- Windows is -6 to 6.
    ELSE

        SET stmt = 'ALTER SERVICE CLASS WLM_SHORT UNDER WLM_TIERS AGENT PRIORITY 3';
        PREPARE s1 FROM stmt;
        EXECUTE s1;
        COMMIT;

        SET stmt = 'ALTER SERVICE CLASS WLM_MEDIUM UNDER WLM_TIERS AGENT PRIORITY 0';
        PREPARE s1 FROM stmt;
        EXECUTE s1;
        COMMIT;

        SET stmt = 'ALTER SERVICE CLASS WLM_LONG UNDER WLM_TIERS AGENT PRIORITY -3';
        PREPARE s1 FROM stmt;
        EXECUTE s1;
        COMMIT;

        SET stmt = 'ALTER SERVICE CLASS SYSDEFAULTSYSTEMCLASS AGENT PRIORITY 5 ';
        PREPARE s1 FROM stmt;
        EXECUTE s1;
        COMMIT;

        SET stmt = 'ALTER SERVICE CLASS SYSDEFAULTMAINTENANCECLASS AGENT PRIORITY -5';
        PREPARE s1 FROM stmt;
        EXECUTE s1;
        COMMIT;

    END IF;

  END@

-- Call the checkPlatformAndSetAgentPriority stored procedure to
-- set agent priorities for service classes
CALL checkPlatformAndSetAgentPriority()@

-- Drop the checkPlatformAndSetAgentPriority stored procedure
DROP PROCEDURE checkPlatformAndSetAgentPriority@

5,設定不同服務類預取(PREFETCH)優先順序

-- #PROPERTY# Set prefetch priority for service classes. Valid values for
-- prefetch priority are HIGH, MEDIUM, LOW or DEFAULT (MEDIUM).
ALTER SERVICE CLASS WLM_SHORT UNDER WLM_TIERS PREFETCH PRIORITY HIGH@

ALTER SERVICE CLASS WLM_MEDIUM UNDER WLM_TIERS PREFETCH PRIORITY MEDIUM@

ALTER SERVICE CLASS WLM_LONG UNDER WLM_TIERS PREFETCH PRIORITY LOW@

ALTER SERVICE CLASS SYSDEFAULTSYSTEMCLASS PREFETCH PRIORITY HIGH@

ALTER SERVICE CLASS SYSDEFAULTMAINTENANCECLASS PREFETCH PRIORITY LOW@

6,建立服務類重新影射閾值並記錄事件監視器日誌
-- #PROPERTY# Set the maximum in service class processor time before
-- remapping and the checking period.  The maximum in service class processor
-- time determines how much processor time an activity can consume in
-- a service class before being remapped to the target service class.
-- For example, if you want an activity to remain in service class
-- WLM_SHORT for a shorter period before being remapped to WLM_MEDIUM,
-- decrease the CPUTIMEINSC threshold value for WLM_TIERS_REMAP_SHORT_TO_MEDIUM.
-- The checking period determines how long to wait between checks for threshold
-- violation.  For serial ESE instances, set the checking period to be
-- the same as the processor time before remap.  For DPF or SMP instances,
-- set a lower value for the checking period than the processor time
-- before remap.
--
-- When one of these thresholds is violated and an activity is remapped
-- to the next service subclass, an event monitor record is written to
-- the threshold violations event monitor.  This way, you can see
-- how many activities are moved between the tiers service subclasses.
-- Logging an event monitor record incurs a small performance cost.  Once
-- the system is tuned and the threshold violation event monitor records
-- are no longer needed, simply remove the 'LOG EVENT MONITOR RECORD'
-- clause from the ALTER THRESHOLD statements.
ALTER THRESHOLD WLM_TIERS_REMAP_SHORT_TO_MEDIUM WHEN
  CPUTIMEINSC > 10 SECONDS CHECKING EVERY 5 SECONDS
  REMAP ACTIVITY TO WLM_MEDIUM LOG EVENT MONITOR RECORD@

ALTER THRESHOLD WLM_TIERS_REMAP_MEDIUM_TO_LONG WHEN
  CPUTIMEINSC > 10 SECONDS CHECKING EVERY 5 SECONDS
  REMAP ACTIVITY TO WLM_LONG LOG EVENT MONITOR RECORD@

7,設定工作類集參考估算成本
-- #PROPERTY# Set work class properties for work class set WLM_TIERS_WCS.
-- This setting determines the initial mapping of DML activites to the
-- service subclasses based on estimated cost. For example, if you want
-- DML activities with a higher estimated cost to map to service class
-- WLM_SHORT instead of WLM_MEDIUM initially, increase the TO value of
-- WLM_SHORT_DML_WC and decrease the corresponding FROM value of WLM_MEDIUM_DML_WC.
-- Work class set properties:
--
--   Work Class        Estimated Cost in
--                     Timerons (From/To)
--   ------------------------------------
--   WLM_SHORT_DML_WC         0/1000
--   WLM_MEDIUM_DML_WC    >1000/100000
--   WLM_LONG_DML_WC    >100000/infinity
--   WLM_CALL_WC        *see note below*
--   WLM_OTHER_WC       *see note below*
--
--   Note:
--   Work classes WLM_CALL_WC and WLM_OTHER_WC contain CALL activities and other
--   activities that do not have cost estimates.  Estimated cost is available
--   only for DML statements. Non-DML activities such as DDL and LOAD will fall
--   under the WLM_OTHER_WC work class. Activities grouped under WLM_CALL_WC are
--   mapped to service class WLM_SHORT initially.  Activities grouped under
--   WLM_OTHER_WC are mapped to service class WLM_MEDIUM and will not get
--   remapped.
ALTER WORK CLASS SET WLM_TIERS_WCS
  ALTER WORK CLASS WLM_SHORT_DML_WC FOR TIMERONCOST FROM 0 TO 1000
  ALTER WORK CLASS WLM_MEDIUM_DML_WC FOR TIMERONCOST FROM 1000 TO 100000
  ALTER WORK CLASS WLM_LONG_DML_WC FOR TIMERONCOST FROM 100000 TO UNBOUNDED@

8,啟用工作負載管理器
-- Alter SYSDEFAULTUSERWORKLOAD to map workload to WLM_TIERS service class
ALTER WORKLOAD SYSDEFAULTUSERWORKLOAD SERVICE CLASS WLM_TIERS@