DB2性能指标查询(部分)

1.花费时间排行前十的SQL语句

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下的函数内

2.读取的数据和搜索数据的占比(可以理解为返回一条数据需要查询的数据条数，越小越好)

SELECT ROWS_READ_PER_ROWS_RETURNED FROM SYSIBMADM.MON_DB_SUMMARY

3.总体缓存命中率

SELECT TOTAL_BP_HIT_RATIO_PERCENT FROM SYSIBMADM.MON_DB_SUMMARY

4.每个缓冲池数据、索引命中率和预取率

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.每一个数据库空间缓冲池和物理内存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.日志缓存满的次数以及平均写入时间

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.锁等待次数以及平均等待时间

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

8.锁超时，锁提升，死锁发生次数

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

9.总排序次数和排序溢出率

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

10.包缓存命中率

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

11.当前会话数

select * from SYSIBMADM.APPLICATIONS

12.数据库启动时间

SELECT
    *
FROM
    SYSIBMADM.SNAPDBM

13.数据库创建时间

select * from sysibm.sysversions

14.缓冲池效率

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

15.各种耗时元素信息  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.日志空间相关信息

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))