Tsql 如何在sybase中实现性能优化过程

我正在执行一项任务，需要在sybase中优化或调优一个过程。我以前从未做过这种事，有人能帮我一下吗

我认为下面提到的程序部分花费了太多的时间-

    DECLARE @lnTotalCount INT


  ---This returns 953 rows-----
   SELECT @lnTotalCount = COUNT(*) FROM 
          firstTable chksts


    SELECT @lnRecordCount = 1, @lnRowsProcessed =0
    WHILE @lnRecordCount <= @lnTotalCount
            BEGIN

            --  SET ROWCOUNT 1

              SELECT  @lcCKPY_REF_ID  = ckck.CKPY_REF_ID,
                @lnCKCK_SEQ_NO        = ckck.CKCK_SEQ_NO,
                @lcPYPY_ID            = ckck.PYPY_ID,
                @lnCKCK_CK_NO         = ckck.CKCK_CK_NO,
                @ldtCKCK_CASHED_DT    = ckck.CKCK_CASHED_DT,
                @ldtCKCK_PRINTED_DT   = ckck.CKCK_PRINTED_DT,
                @ldtCKCK_REISS_DT     = ckck.CKCK_REISS_DT,
                @lcCKCK_TYPE          = ckck.CKCK_TYPE,
                @lcCKCK_PAYEE_NAME    = ckck.CKCK_PAYEE_NAME,
                @lcCKCK_CURR_STS      = LTRIM(RTRIM(chksts.[TRANSACTION])),
                @lnCKST_SEQ_NO        = ckck.CKST_SEQ_NO,
                @lcCKCK_REISS_USUS_ID = ckck.CKCK_REISS_USUS_ID,
                @lnCKCK_LOCK_TOKEN    = ckck.CKCK_LOCK_TOKEN,
                @ldtATXR_SOURCE_ID    = ckck.ATXR_SOURCE_ID,
                @lnBPID_CK_NO         = chksts.SERIAL_NUMBER

              FROM
                 firstTable chksts,
                 secondTable ckck,
                 thirdTable bpid

              WHERE ckck.CKPY_REF_ID   = bpid.CKPY_REF_ID
                AND bpid.BPID_CK_NO    = chksts.SERIAL_NUMBER
                AND ckck.CKCK_SEQ_NO   = bpid.CKCK_SEQ_NO
                AND ckck.CKCK_CURR_STS IN ('03','X3') 
                AND chksts.ID = @lnRecordCount
 IF(@@ROWCOUNT<>0) /* 1.5 If-Else condition*/
          BEGIN  
          EXEC @lnRetCd = ABProcedure
                      NULL,
                      NULL,
                      @lcCKPY_REF_ID,
                      @lnCKCK_SEQ_NO,
                      @lcPYPY_ID,
                      @lnCKCK_CK_NO,
                      @ldtCKCK_CASHED_DT,
                      @ldtCKCK_PRINTED_DT,
                      @ldtCKCK_REISS_DT,
                      @lcCKCK_TYPE,
                      @lcCKCK_PAYEE_NAME,
                      @lcCKCK_CURR_STS,
                      @lnCKST_SEQ_NO,
                      @lcCKCK_REISS_USUS_ID,
                      @lnCKCK_LOCK_TOKEN,
                      @ldtATXR_SOURCE_ID

               SELECT @lnRowsProcessed = @lnRowsProcessed + @@ROWCOUNT
 SELECT @lnRecordCount = @lnRecordCount + 1

DECLARE@lnTotalCount INT
---这将返回953行-----
从中选择@lnTotalCount=COUNT（*）
第一表chksts
选择@lnRecordCount=1，@lnRowsProcessed=0
当@lnRecordCount时，您是否已经检查了从中选择的3个表的索引是否正确？确保WHERE子句中包含的列具有索引，即您真的只获得了行计数？摆脱迭代循环，连接约束上的表并获得计数（*）。在RDBMS中，基于集合的操作几乎总是比迭代更可取。Volvox，你能给我一些你建议的例子吗，因为我必须一行一行地处理。有没有更好的方法？对不起，我不知道……请看我更新的问题。。。。