合并突然陷入困境

Question

我有一个存储过程，突然陷入合并，但是已经运行了好几年。有什么建议吗？该SP在Oracle SQL Developer中，并在Visual Studios SSIS程序包中执行

以下查询：

MERGE INTO CORE_APPT C 
  USING (
          SELECT DISTINCT
            TST_TKR_ID,
            TST_TKR_ID_SRC,
            APPT_ID_SRC,
            APPT_CRETN_DTE,
            APNTMT_DT,  
            ETS_APNTMT_ID,
            ETS_TST_CNTR,
            TST_STS_TYP_DESC,
            APPT_STS_TYP,
            TST_DLVR_MTHD_TYP_CDE,
            DLVR_GRP_TYP,
            TST_LNCH_TM,
            TRNSCTN_ID,
            TST_PKG_ID,
            RND_TRIP_TST_FLG,
            UPDT_DTE_TM,
            PROD_ID,
            ACTN_DTE_TM,
            TST_DURN,
            BRKRG_APPT_UPDT_DTM,
            TST_APPT_TYP_CDE,
            CNCL_MKUP_RSN_TYP,
            DLNQNT_HLD_FLG,
            TST_TKR_TST_UPDT_DTE_TM,
            SCR_HLD_LVL_TYP_CDE,
            SCR_CNCL_FLG,
            ETS_CANDTE_SCR_HLD_FLG,
            TST_CNTR_HLD_FLG,
            TST_ADM_HLD_FLG,
            ETS_SCR_CNCL_FLG,
            TST_ADM_HLD_RSN_CDE,
            TST_CNTR_HLD_RSN_CDE,
            ETS_CANDTE_SCR_HLD_RSN_CDE,
            ETS_SCR_CNCL_RSN_CDE,
            DLNQNT_HLD_RSN_CDE,
            TST_TKR_SCR_STS_TYP_CDE,
            TST_TKR_SCR_STS_RSN_TYP_CDE,
            PYMT_NO,
            DATA_SRCE AS DATA_SRCE,
            CURRENT_FLAG,
            PRGRM_TYP,
            sysdate as RCD_CRTD_DTE,
            user as RCD_CRTD_USER,
            REG_SYS_ID AS REG_SYS_ID,
            TST_NAM AS TST_NAM,
            CNTRY_SETL_RSP AS CNTRY_SETL_RSP
          FROM STG_CMMN_APPT A
          WHERE A.CURRENT_FLAG = 'Y'
        ) S
    ON (C.APPT_ID_SRC = S.APPT_ID_SRC
        AND C.REG_SYS_ID = S.REG_SYS_ID
        AND C.DATA_SRCE = S.DATA_SRCE)  -- added in EREG4.0 changes
  WHEN MATCHED THEN UPDATE
    SET C.CURRENT_FLAG = 'N'
        WHERE C.CURRENT_FLAG = 'Y'
  WHEN NOT MATCHED THEN INSERT
    (
            C.TST_TKR_ID,
            C.TST_TKR_ID_SRC,
            C.APPT_ID_SRC,
            C.APPT_CRETN_DTE,
            C.APNTMT_DT,
            C.ETS_APNTMT_ID,
            C.TST_CNTR_ID_SRC,
            C.TST_STS_TYP_DESC,
            C.APPT_STS_TYP,
            C.TST_DLVR_MTHD_TYP_CDE,
            C.DLVR_GRP_TYP,
            C.TST_LNCH_TM,
            C.TRNSCTN_ID,
            C.TST_PKG_ID,
            C.RND_TRIP_TST_FLG,
            C.UPDT_DTE_TM,
            C.PROD_ID,
            C.ACTN_DTE_TM,
            C.TST_DURN,
            C.BRKRG_APPT_UPDT_DTM,
            C.TST_APPT_TYP_CDE,
            C.CNCL_MKUP_RSN_TYP,
            C.DLNQNT_HLD_FLG,
            C.TST_TKR_TST_UPDT_DTE_TM,
            C.SCR_HLD_LVL_TYP_CDE,
            C.SCR_CNCL_FLG,
            C.ETS_CANDTE_SCR_HLD_FLG,
            C.TST_CNTR_HLD_FLG,
            C.TST_ADM_HLD_FLG,
            C.ETS_SCR_CNCL_FLG,
            C.TST_ADM_HLD_RSN_CDE,
            C.TST_CNTR_HLD_RSN_CDE,
            C.ETS_CANDTE_SCR_HLD_RSN_CDE,
            C.ETS_SCR_CNCL_RSN_CDE,
            C.DLNQNT_HLD_RSN_CDE,
            C.TST_TKR_SCR_STS_TYP_CDE,
            C.TST_TKR_SCR_STS_RSN_TYP_CDE,
            C.PYMT_NO,
            C.DATA_SRCE,
            C.CURRENT_FLAG,
            C.PGM_TYP,
            C.RCD_CRTD_DTE,
            C.RCD_CRTD_USER,
            C.REG_SYS_ID,
            C.TST_NAM,
            C.CNTRY_SETL_RSP
    )
    VALUES
    ( 
            S.TST_TKR_ID,
            S.TST_TKR_ID_SRC,
            S.APPT_ID_SRC,
            S.APPT_CRETN_DTE,
            S.APNTMT_DT,
            S.ETS_APNTMT_ID,
            S.ETS_TST_CNTR,
            S.TST_STS_TYP_DESC,
            S.APPT_STS_TYP,
            S.TST_DLVR_MTHD_TYP_CDE,
            S.DLVR_GRP_TYP,
            S.TST_LNCH_TM,
            S.TRNSCTN_ID,
            S.TST_PKG_ID,
            S.RND_TRIP_TST_FLG,
            S.UPDT_DTE_TM,
            S.PROD_ID,
            S.ACTN_DTE_TM,
            S.TST_DURN,
            S.BRKRG_APPT_UPDT_DTM,
            S.TST_APPT_TYP_CDE,
            S.CNCL_MKUP_RSN_TYP,
            S.DLNQNT_HLD_FLG,
            S.TST_TKR_TST_UPDT_DTE_TM,
            S.SCR_HLD_LVL_TYP_CDE,
            S.SCR_CNCL_FLG,
            S.ETS_CANDTE_SCR_HLD_FLG,
            S.TST_CNTR_HLD_FLG,
            S.TST_ADM_HLD_FLG,
            S.ETS_SCR_CNCL_FLG,
            S.TST_ADM_HLD_RSN_CDE,
            S.TST_CNTR_HLD_RSN_CDE,
            S.ETS_CANDTE_SCR_HLD_RSN_CDE,
            S.ETS_SCR_CNCL_RSN_CDE,
            S.DLNQNT_HLD_RSN_CDE,
            S.TST_TKR_SCR_STS_TYP_CDE,
            S.TST_TKR_SCR_STS_RSN_TYP_CDE,
            S.PYMT_NO,
            S.DATA_SRCE,
            S.CURRENT_FLAG,
            S.PRGRM_TYP,
            S.RCD_CRTD_DTE,
            S.RCD_CRTD_USER,
            S.REG_SYS_ID,
            S.TST_NAM,
            S.CNTRY_SETL_RSP
    )

    ;

TIA！