DB2性能指標查詢(部分)

1.花費時間排行前十的SQL語句

SELECT
    TOTAL_ACT_TIME/NUM_EXEC_WITH_METRICS AS AVG_EXE_TIME,
    SUBSTR(STMT_TEXT,1,40)               AS SQL
FROM
    TABLE(MON_GET_PKG_CACHE_STMT ( NULL, NULL, NULL, -2))
WHERE
    NUM_EXEC_WITH_METRICS>=1
ORDER BY
    1 desc fetch FIRST 10 rows only


其中MON_GET_PKG_CACHE_STMT是在SYSPROC下的函數內

2.讀取的數據和搜索數據的佔比(可以理解爲返回一條數據需要查詢的數據條數，越小越好)

SELECT ROWS_READ_PER_ROWS_RETURNED FROM SYSIBMADM.MON_DB_SUMMARY

3.總體緩存命中率

SELECT TOTAL_BP_HIT_RATIO_PERCENT FROM SYSIBMADM.MON_DB_SUMMARY

4.每個緩衝池數據、索引命中率和預取率

SELECT
    SUBSTR(BP_NAME,1,18) AS BP_NAME,
    DATA_HIT_RATIO_PERCENT,
    INDEX_HIT_RATIO_PERCENT,
    PREFETCH_RATIO_PERCENT
FROM
    SYSIBMADM.MON_BP_UTILIZATION

5.每一個數據庫空間緩衝池和物理內存IOPS

SELECT
    SUBSTR(TBSP_NAME,1,20) AS TBSP_NAME,
    POOL_READ_TIME/
    CASE
        WHEN POOL_DATA_P_READS+POOL_INDEX_P_READS+POOL_TEMP_DATA_P_READS+POOL_TEMP_INDEX_P_READS>0
        THEN POOL_DATA_P_READS+POOL_INDEX_P_READS+POOL_TEMP_DATA_P_READS+POOL_TEMP_INDEX_P_READS
        ELSE 1
    END AS AVG_BP_READ_TIME,
    POOL_WRITE_TIME/
    CASE
        WHEN POOL_DATA_WRITES+POOL_INDEX_WRITES>0
        THEN POOL_DATA_WRITES+POOL_INDEX_WRITES
        ELSE 1
    END AS AVG_BP_WRITE_TIME,
    DIRECT_READ_TIME /
    CASE
        WHEN DIRECT_READS/8 > 0
        THEN DIRECT_READS/8
        ELSE 1
    END AS AVG_DIRECT_READ_TIME,
    DIRECT_WRITE_TIME /
    CASE
        WHEN DIRECT_WRITES/8 > 0
        THEN DIRECT_WRITES/8
        ELSE 1
    END AS AVG_DIRECT_WRITE_TIME
FROM
    TABLE(MON_GET_TABLESPACE(NULL,NULL))

6.日誌緩存滿的次數以及平均寫入時間

SELECT
    NUM_LOG_BUFFER_FULL,
    LOG_WRITE_TIME /
    CASE
        WHEN LOG_WRITES > 0
        THEN LOG_WRITES
        ELSE 1
    END AS AVG_LOG_WRITE_TIME
FROM
    TABLE(MON_GET_TRANSACTION_LOG(-2))

7.鎖等待次數以及平均等待時間

SELECT
    LOCK_WAITS,
    LOCK_WAIT_TIME/LOCK_WAITS AS AVG_LOCK_WAIT_TIME
FROM
    TABLE(MON_GET_DATABASE(-2))

8.鎖超時，鎖提升，死鎖發生次數

SELECT
    LOCK_TIMEOUTS,
    LOCK_ESCALS_MAXLOCKS,
    LOCK_ESCALS_LOCKLIST,
    DEADLOCKS
FROM
    TABLE(MON_GET_DATABASE(-2))

9.總排序次數和排序溢出率

SELECT
    (SORT_OVERFLOWS * 100) / TOTAL_SORTS AS SORT_OVERFLOW_RATIO,
    TOTAL_SORTS
FROM
    TABLE(MON_GET_DATABASE(-2))

10.包緩存命中率

SELECT
    (PKG_CACHE_LOOKUPS-PKG_CACHE_INSERTS)*100 / PKG_CACHE_LOOKUPS
FROM
    TABLE(MON_GET_DATABASE(-2))

11.當前會話數

select * from SYSIBMADM.APPLICATIONS

12.數據庫啓動時間

SELECT
    *
FROM
    SYSIBMADM.SNAPDBM

13.數據庫創建時間

select * from sysibm.sysversions

14.緩衝池效率

SELECT
    BP_NAME,
    AVG_WRITE_TIME,
    SYNC_WRITES_PERCENT,
    AVG_SYNC_WRITE_TIME,
    AVG_ASYNC_WRITE_TIME
FROM
    SYSIBMADM.MON_BP_UTILIZATION

15.各種耗時元素信息  毫秒

SELECT
    SUM(TOTAL_WAIT_TIME)                   AS WAIT,
    SUM(TOTAL_COMPILE_PROC_TIME)           AS COMPILE,
    SUM(TOTAL_IMPLICIT_COMPILE_PROC_TIME)  AS IMP_COMPILE,
    SUM(TOTAL_SECTION_PROC_TIME)           AS SECTION,
    SUM(total_routine_user_code_proc_time) AS ROUTINE_USER_CODE,
    SUM(TOTAL_COMMIT_PROC_TIME)            AS COMMIT,
    SUM(TOTAL_REORG_PROC_TIME)             AS REORG,
    SUM(TOTAL_RUNSTATS_PROC_TIME)          AS RUNSTATS,
    SUM(TOTAL_ROLLBACK_PROC_TIME)          AS ROLLBACK,
    SUM(TOTAL_LOAD_PROC_TIME)              AS LOAD,
    SUM(total_connect_request_proc_time)   AS CONNECT_REQUEST
FROM
    TABLE(MON_GET_SERVICE_SUBCLASS('SYSDEFAULTUSERCLASS','SYSDEFAULTSUBCLASS',NULL))

16.日誌空間相關信息

SELECT
    1.0*TOTAL_LOG_AVAILABLE/1024/1024 AS total_log_available_mb,
    1.0*TOTAL_LOG_USED/1024/1024      AS total_log_used_mb,
    1.0*SEC_LOG_USED_TOP/1024/1024    AS sec_log_used_top_mb,
    1.0*TOT_LOG_USED_TOP/1024/1024    AS total_log_used_top,
    1.0*SEC_LOGS_ALLOCATED/1024/1024  AS sec_logs_allocated_mb,
    APPL_ID_OLDEST_XACT
FROM
    TABLE(SNAP_GET_DB(CAST (NULL AS VARCHAR(128)), -2))