目的：
測試DB2負載管理(WLM,對不同操作分配不同代理優先順序,在超過指定CPU資源後仍未完成的,降低優先順序,類似於Oracle的ResourceManager);本指令碼摘錄自DB2安裝目錄admin_scripts/wlmtiersdefault.db2。
版本：Windows DB2 Express-C V9.7
說明:由於該版本不支援該特性,抱錯SQL8029N 找不到所請求功能的有效許可證金鑰,沒有測試.

操作：
使用sqllib/misc/wlmevmon.ddl建立WLM事件監視器;
需要許可權DBADM或WLMADM;
步驟:
1,建立服務類,層次關係如下:
------------WLM_TIERS
-- +----------+-----------+
-- | | |
--WLM_SHORT WLM_MEDIUM WLM_LONG
connect to sample@

-- 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@

3,建立工作類集,工作動作集
-- Create work class set WLM_TIERS_WCS to identify activities
-- that can be remapped by CPUTIMEINSC threshold.
CREATE WORK CLASS SET WLM_TIERS_WCS
( WORK CLASS WLM_DML_WC WORK TYPE DML,
WORK CLASS WLM_CALL_WC WORK TYPE CALL,
WORK CLASS WLM_OTHER_WC WORK TYPE ALL )@

-- Create work action set WLM_TIERS_WAS to map activities that
-- can be remapped by CPUTIMEINSC threshold to service subclass
-- WLM_SHORT. All other activities are mapped to service subclass
-- WLM_MEDIUM and will not get remapped.
--DML--&gtWLM_SHORT
--CALL--&gtWLM_SHORT
--OTHER--&gtWLM_MEDIUM
CREATE WORK ACTION SET WLM_TIERS_WAS FOR SERVICE CLASS WLM_TIERS
USING WORK CLASS SET WLM_TIERS_WCS
( WORK ACTION WLM_DML_WA ON WORK CLASS WLM_DML_WC
      MAP ACTIVITY TO WLM_SHORT,
    WORK ACTION WLM_CALL_WA ON WORK CLASS WLM_CALL_WC
      MAP ACTIVITY TO WLM_SHORT,
    WORK ACTION WLM_OTHER_WC 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.
-- Service class properties:
--
--    Service Class    Agent Priority   Prefetch Priority
--                     (UNIX / Win)
--    ---------------------------------------------------
--    WLM_SHORT        -10 / 3         High
--    WLM_MEDIUM        0 / 0         Medium
--    WLM_LONG          10 / -3         Low
--    Default System   -15 / 5         High
--    Default Maint.    15 / -5         Low

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,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@

DB2負載管理(WLM)(一)

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