変換関数はSQL Serverで実行に時間がかかります

Question

他の20個の列と共に、異なるdatetime列に対して15 convert関数呼び出しを含むクエリがあります。 Convert関数で実行した場合、クエリには約5分かかりますが、変換関数をコメントアウト/削除すると15秒しかかかりません。

CONVERT (VARCHAR (10), TABLE.[COLUMN NAME], 101) 


SELECT 
     T1.CONFLICT_ID, 
     CONVERT (VARCHAR (10),T1.LAST_UPD, 101) + ' ' + CONVERT (VARCHAR (10),T1.LAST_UPD, 8), 
     CONVERT (VARCHAR (10),T1.CREATED, 101) + ' ' + CONVERT (VARCHAR (10),T1.CREATED, 8), 
     T1.LAST_UPD_BY, 
     T1.CREATED_BY, 
     T1.MODIFICATION_NUM, 
     T1.ROW_ID, 
     CONVERT (VARCHAR (10),T1.CREATED, 101) + ' ' + CONVERT (VARCHAR (10),T1.CREATED, 8), 
     T1.ROW_ID, 
     CONVERT (VARCHAR (10),T1.LAST_UPD, 101) + ' ' + CONVERT (VARCHAR (10),T1.LAST_UPD, 8), 
     T1.LAST_UPD_BY, 
     CONVERT (VARCHAR (10),T1.TODO_AFTER_DT, 101) + ' ' + CONVERT (VARCHAR (10),T1.TODO_AFTER_DT, 8), 
     T1.APPT_REPT_TYPE, 
     T27.ATTRIB_47, 
     T1.ROW_STATUS, 
     T24.OWN_INST_ID, 
     T24.INTEGRATION_ID, 
     T15.SR_TITLE, 
     T27.ATTRIB_45, 
     T1.APPT_ALARM_TM_MIN, 
     T15.SR_NUM, 
     T1.PR_PRDINT_ID, 
     T1.PR_SR_ID, 
     T1.PR_SYMPTOM_CD, 
     CONVERT (VARCHAR (10),T13.PLAN_END_DT, 101) + ' ' + CONVERT (VARCHAR (10),T13.PLAN_END_DT, 8), 
     CONVERT (VARCHAR (10),T13.PLAN_START_DT, 101) + ' ' + CONVERT (VARCHAR (10),T13.PLAN_START_DT, 8), 
     T12.BL_CLASS_CD, 
     T12.BL_CURCY_CD, 
     T1.PROJ_ID, 
     CONVERT (VARCHAR (10),T13.ACTL_END_DT, 101) + ' ' + CONVERT (VARCHAR (10),T13.ACTL_END_DT, 8), 
     CONVERT (VARCHAR (10),T13.ACTL_START_DT, 101) + ' ' + CONVERT (VARCHAR (10),T13.ACTL_START_DT, 8), 
     T9.NAME, 
     T9.CURCY_CD, 
     T1.OPTY_ID, 
     T10.BASE_CURCY_CD, 
     T1.TARGET_OU_ID, 
     T10.LOC, 
     T10.NAME, 
     CONVERT (VARCHAR (10),T1.TODO_ACTL_END_DT, 101) + ' ' + CONVERT (VARCHAR (10),T1.TODO_ACTL_END_DT, 8), 
     T1.SRV_REGN_ID, 
     T16.NAME, 
     T18.AMS_ROUTE_TO_CD, 
     T1.ME_EVT_ID, 
     T1.ASGN_MANL_FLG, 
     T20.MSTR_CASE_ID, 
     T22.NUM_PAGE, 
     T18.AMS_ACT_ID, 
     T19.MAX_CAPABILITY_LVL, 
     T19.MIN_CAPABILITY_LVL, 
     T19.RTE_APPR_FLG, 
     T1.OWNER_LOGIN, 
     T2.BU_ID, 
     T1.OWNER_PER_ID, 
     T1.APPT_REPT_FLG, 
     CONVERT (VARCHAR (10),T1.APPT_REPT_END_DT, 101) + ' ' + CONVERT (VARCHAR (10),T1.APPT_REPT_END_DT, 8), 
     T1.PR_ORDER_ID, 
     T1.DO_NOT_ROUTE_FLG, 
     T1.TARGET_OU_ADDR_ID, 
     T1.ARREST_ID, 
     T1.ASSET_ID, 
     T1.ASGN_USR_EXCLD_FLG, 
     T7.PR_POSTN_ID, 
     T28.PIM_APPT_FLG, 
     T28.SEBL_APPT_FLG, 
     T28.UNSPRTD_REPT_FLG, 
     T26.SRM_REQUEST_ID, 
     T12.NAME, 
     T12.PROJ_NUM, 
     T1.X_ENTITY_TYPE, 
     T1.XTRNL_ACCESS_FLG, 
     T29.EVIDENCE_ID, 
     T1.SRA_TYPE_CD, 
     T1.COMM_ID, 
     T1.COMMENTS_LONG, 
     T1.COMMENTS, 
     T10.PR_ADDR_ID, 
     T1.PR_PROD_CAT_ID, 
     T3.FST_NAME, 
     T1.TARGET_PER_ID, 
     T3.LAST_NAME, 
     T1.OWNER_OU_ID, 
     T1.COMM_ID, 
     T1.CMPLTD_FLG, 
     T20.CASE_NUM, 
     T1.X_OFFENSE_ID, 
     T27.ATTRIB_37, 
     T1.PREV_ACT_ID, 
     CONVERT (VARCHAR (10),T1.APPT_END_DT, 101) + ' ' + CONVERT (VARCHAR (10),T1.APPT_END_DT, 8), 
     CONVERT (VARCHAR (10),T1.APPT_END_TM, 101) + ' ' + CONVERT (VARCHAR (10),T1.APPT_END_TM, 8), 
     T14.SCHED_ENGINE_CD, 
     T6.ASSET_NUM, 
     T11.NAME, 
     T1.OWNER_POSTN_ID, 
     T25.WEB_ACCESS_FLG, 
     T1.SRC_ID, 
     T1.X_CASE_ID, 
     T20.NAME, 
     CONVERT (VARCHAR (10),T1.TODO_DUE_DT, 101) + ' ' + CONVERT (VARCHAR (10),T1.TODO_DUE_DT, 8), 
     T1.APPT_DURATION_MIN, 
     CONVERT (VARCHAR (10),T18.TLR_EFFECTIVE_DT, 101) + ' ' + CONVERT (VARCHAR (10),T18.TLR_EFFECTIVE_DT, 8), 
     T26.ACTIVE_FLG, 
     T19.NAME, 
     T1.SRA_DEFECT_ID, 
     T1.SRA_SR_ID, 
     T1.TMPL_PLANITEM_ID, 
     T1.ACTIVITY_UID, 
     T1.AGREEMENT_ID, 
     T1.PYMNT_FLG, 
     T1.ALARM_FLAG, 
     T1.CREATOR_LOGIN, 
     T1.ASGN_DNRM_FLG, 
     T1.NAME, 
     T18.TLR_INTG_RET_CD, 
     T1.INCIDENT_ID, 
     T8.X_SESSION_ID, 
     T18.TLR_INTG_ID, 
     T18.TLR_INTG_MSG, 
     CONVERT (VARCHAR (10),T1.TODO_ACTL_END_DT, 101) + ' ' + CONVERT (VARCHAR (10),T1.TODO_ACTL_END_DT, 8), 
     T1.DONE_FLG, 
     CONVERT (VARCHAR (10),T1.APPT_START_DT, 101) + ' ' + CONVERT (VARCHAR (10),T1.APPT_START_DT, 8), 
     T4.POSTN_TYPE_CD, 
     CONVERT (VARCHAR (10),T1.STATUS_UPD_TS, 101) + ' ' + CONVERT (VARCHAR (10),T1.STATUS_UPD_TS, 8), 
     T10.DIVISION, 
     T1.COMMENTS, 
     T26.STAGE_ID, 
     CONVERT (VARCHAR (10),T1.APPT_START_TM, 101) + ' ' + CONVERT (VARCHAR (10),T1.APPT_START_TM, 8), 
     CONVERT (VARCHAR (10),T1.TODO_ACTL_START_DT, 101) + ' ' + CONVERT (VARCHAR (10),T1.TODO_ACTL_START_DT, 8), 
     T1.ASSESS_7, 
     T1.X_AUTO_FLG, 
     T1.X_SEQUENCE, 
     T23.FORMAT_TYPE_CD, 
     T1.X_OFFENSE_ID, 
     T5.EMP_ID, 
     T21.SRV_REGN_ID, 
     T2.FST_NAME, 
     T2.LAST_NAME, 
     T14.SCHED_PARAM_SET_ID, 
     T1.PAR_EVT_ID, 
     T1.BILLABLE_FLG, 
     T1.APPT_REPT_APPT_ID, 
     T1.APPT_REPT_REPL_CD, 
     T1.TEMPLATE_FLG, 
     T1.ASGN_SYS_FLG, 
     T1.PCT_COMPLETE, 
     T1.TARGET_PER_ADDR_ID, 
     T18.SUB_TYPE_CD, 
     T1.CL_SUBJ_ID, 
     T1.CAL_DISP_FLG, 
     CONVERT (VARCHAR (10),T1.TODO_PLAN_START_DT, 101) + ' ' + CONVERT (VARCHAR (10),T1.TODO_PLAN_START_DT, 8), 
     CONVERT (VARCHAR (10),T1.TODO_PLAN_END_DT, 101) + ' ' + CONVERT (VARCHAR (10),T1.TODO_PLAN_END_DT, 8), 
     T1.COST_CURCY_CD, 
     T15.SR_STAT_ID, 
     T1.SUBTYPE_CD, 
     T1.TODO_CD, 
     T20.X_CASE_MODE, 
     T1.CAL_TYPE_CD, 
     T1.EVT_STAT_CD, 
     T30.ROW_ID, 
     T31.ROW_STATUS, 
     T33.AMS_CAPABILITY_LVL, 
     T34.LOGIN, 
     T32.ROW_ID, 
     T36.GEOCD_VALID_FLG, 
     T22.ROW_ID, 
     T22.PAR_ROW_ID, 
     T22.MODIFICATION_NUM, 
     T22.CREATED_BY, 
     T22.LAST_UPD_BY, 
     CONVERT (VARCHAR (10),T22.CREATED, 101) + ' ' + CONVERT (VARCHAR (10),T22.CREATED, 8), 
     CONVERT (VARCHAR (10),T22.LAST_UPD, 101) + ' ' + CONVERT (VARCHAR (10),T22.LAST_UPD, 8), 
     T22.CONFLICT_ID, 
     T22.PAR_ROW_ID, 
     T18.ROW_ID, 
     T18.PAR_ROW_ID, 
     T18.MODIFICATION_NUM, 
     T18.CREATED_BY, 
     T18.LAST_UPD_BY, 
     CONVERT (VARCHAR (10),T18.CREATED, 101) + ' ' + CONVERT (VARCHAR (10),T18.CREATED, 8), 
     CONVERT (VARCHAR (10),T18.LAST_UPD, 101) + ' ' + CONVERT (VARCHAR (10),T18.LAST_UPD, 8), 
     T18.CONFLICT_ID, 
     T18.PAR_ROW_ID, 
     T23.ROW_ID, 
     T23.PAR_ROW_ID, 
     T23.MODIFICATION_NUM, 
     T23.CREATED_BY, 
     T23.LAST_UPD_BY, 
     CONVERT (VARCHAR (10),T23.CREATED, 101) + ' ' + CONVERT (VARCHAR (10),T23.CREATED, 8), 
     CONVERT (VARCHAR (10),T23.LAST_UPD, 101) + ' ' + CONVERT (VARCHAR (10),T23.LAST_UPD, 8), 
     T23.CONFLICT_ID, 
     T23.PAR_ROW_ID, 
     T24.ROW_ID, 
     T24.PAR_ROW_ID, 
     T24.MODIFICATION_NUM, 
     T24.CREATED_BY, 
     T24.LAST_UPD_BY, 
     CONVERT (VARCHAR (10),T24.CREATED, 101) + ' ' + CONVERT (VARCHAR (10),T24.CREATED, 8), 
     CONVERT (VARCHAR (10),T24.LAST_UPD, 101) + ' ' + CONVERT (VARCHAR (10),T24.LAST_UPD, 8), 
     T24.CONFLICT_ID, 
     T24.PAR_ROW_ID, 
     T25.ROW_ID, 
     T25.PAR_ROW_ID, 
     T25.MODIFICATION_NUM, 
     T25.CREATED_BY, 
     T25.LAST_UPD_BY, 
     CONVERT (VARCHAR (10),T25.CREATED, 101) + ' ' + CONVERT (VARCHAR (10),T25.CREATED, 8), 
     CONVERT (VARCHAR (10),T25.LAST_UPD, 101) + ' ' + CONVERT (VARCHAR (10),T25.LAST_UPD, 8), 
     T25.CONFLICT_ID, 
     T25.PAR_ROW_ID, 
     T26.ROW_ID, 
     T26.PAR_ROW_ID, 
     T26.MODIFICATION_NUM, 
     T26.CREATED_BY, 
     T26.LAST_UPD_BY, 
     CONVERT (VARCHAR (10),T26.CREATED, 101) + ' ' + CONVERT (VARCHAR (10),T26.CREATED, 8), 
     CONVERT (VARCHAR (10),T26.LAST_UPD, 101) + ' ' + CONVERT (VARCHAR (10),T26.LAST_UPD, 8), 
     T26.CONFLICT_ID, 
     T26.PAR_ROW_ID, 
     T27.ROW_ID, 
     T27.PAR_ROW_ID, 
     T27.MODIFICATION_NUM, 
     T27.CREATED_BY, 
     T27.LAST_UPD_BY, 
     CONVERT (VARCHAR (10),T27.CREATED, 101) + ' ' + CONVERT (VARCHAR (10),T27.CREATED, 8), 
     CONVERT (VARCHAR (10),T27.LAST_UPD, 101) + ' ' + CONVERT (VARCHAR (10),T27.LAST_UPD, 8), 
     T27.CONFLICT_ID, 
     T27.PAR_ROW_ID, 
     T28.ROW_ID, 
     T28.PAR_ROW_ID, 
     T28.MODIFICATION_NUM, 
     T28.CREATED_BY, 
     T28.LAST_UPD_BY, 
     CONVERT (VARCHAR (10),T28.CREATED, 101) + ' ' + CONVERT (VARCHAR (10),T28.CREATED, 8), 
     CONVERT (VARCHAR (10),T28.LAST_UPD, 101) + ' ' + CONVERT (VARCHAR (10),T28.LAST_UPD, 8), 
     T28.CONFLICT_ID, 
     T28.PAR_ROW_ID, 
     T29.ROW_ID, 
     T29.PAR_ROW_ID, 
     T29.MODIFICATION_NUM, 
     T29.CREATED_BY, 
     T29.LAST_UPD_BY, 
     CONVERT (VARCHAR (10),T29.CREATED, 101) + ' ' + CONVERT (VARCHAR (10),T29.CREATED, 8), 
     CONVERT (VARCHAR (10),T29.LAST_UPD, 101) + ' ' + CONVERT (VARCHAR (10),T29.LAST_UPD, 8), 
     T29.CONFLICT_ID, 
     T29.PAR_ROW_ID, 
     T30.ROW_ID, 
     T31.ROW_ID, 
     T32.ROW_ID, 
     T35.ROW_ID, 
     T36.ROW_ID 
     FROM 
     dbo.S_EVT_ACT T1 
      LEFT OUTER JOIN dbo.S_CONTACT T2 ON T1.OWNER_PER_ID = T2.PAR_ROW_ID 
      LEFT OUTER JOIN dbo.S_CONTACT T3 ON T1.TARGET_PER_ID = T3.PAR_ROW_ID 
      LEFT OUTER JOIN dbo.S_POSTN T4 ON T2.PR_HELD_POSTN_ID = T4.ROW_ID 
      LEFT OUTER JOIN dbo.S_ACT_EMP T5 ON T1.ROW_ID = T5.ACTIVITY_ID 
      LEFT OUTER JOIN dbo.S_ASSET T6 ON T1.ASSET_ID = T6.ROW_ID 
      LEFT OUTER JOIN dbo.S_CONTACT T7 ON T1.TARGET_PER_ID = T7.PAR_ROW_ID 
      LEFT OUTER JOIN dbo.S_INCIDENT T8 ON T1.INCIDENT_ID = T8.ROW_ID 
      LEFT OUTER JOIN dbo.S_OPTY T9 ON T1.OPTY_ID = T9.ROW_ID 
      LEFT OUTER JOIN dbo.S_ORG_EXT T10 ON T1.TARGET_OU_ID = T10.PAR_ROW_ID 
      LEFT OUTER JOIN dbo.S_POSTN T11 ON T1.OWNER_POSTN_ID = T11.PAR_ROW_ID 
      LEFT OUTER JOIN dbo.S_PROJ T12 ON T1.PROJ_ID = T12.ROW_ID 
      LEFT OUTER JOIN dbo.S_PROJITEM T13 ON T1.PROJ_ITEM_ID = T13.ROW_ID 
      LEFT OUTER JOIN dbo.S_SRV_REGN T14 ON T1.SRV_REGN_ID = T14.ROW_ID 
      LEFT OUTER JOIN dbo.S_SRV_REQ T15 ON T1.SRA_SR_ID = T15.ROW_ID 
      LEFT OUTER JOIN dbo.S_TIMEZONE T16 ON T14.TIME_ZONE_ID = T16.ROW_ID 
      LEFT OUTER JOIN dbo.S_OPTY_POSTN T17 ON T1.OPTY_ID = T17.OPTY_ID AND T17.POSITION_ID = '1-D38P' 
      LEFT OUTER JOIN dbo.S_EVT_ACT_FNX T18 ON T1.ROW_ID = T18.PAR_ROW_ID 
      LEFT OUTER JOIN dbo.S_FN_APPR T19 ON T18.AMS_ACT_ID = T19.ROW_ID 
      LEFT OUTER JOIN dbo.S_CASE T20 ON T1.X_CASE_ID = T20.ROW_ID 
      LEFT OUTER JOIN dbo.S_EMP_PER T21 ON T1.OWNER_PER_ID = T21.PAR_ROW_ID 
      LEFT OUTER JOIN dbo.S_EVT_ACT_LSX T22 ON T1.ROW_ID = T22.PAR_ROW_ID 
      LEFT OUTER JOIN dbo.S_EVT_MAIL T23 ON T1.ROW_ID = T23.PAR_ROW_ID 
      LEFT OUTER JOIN dbo.S_EVT_ACT_SS T24 ON T1.ROW_ID = T24.PAR_ROW_ID 
      LEFT OUTER JOIN dbo.S_SUSP_ACT T25 ON T1.ROW_ID = T25.PAR_ROW_ID 
      LEFT OUTER JOIN dbo.S_EVT_MKTG T26 ON T1.ROW_ID = T26.PAR_ROW_ID 
      LEFT OUTER JOIN dbo.S_EVT_ACT_X T27 ON T1.ROW_ID = T27.PAR_ROW_ID 
      LEFT OUTER JOIN dbo.S_EVT_CAL T28 ON T1.ROW_ID = T28.PAR_ROW_ID 
      LEFT OUTER JOIN dbo.S_EVT_CASE T29 ON T1.ROW_ID = T29.PAR_ROW_ID 
      LEFT OUTER JOIN dbo.S_PARTY T30 ON T1.TARGET_PER_ID = T30.ROW_ID 
      LEFT OUTER JOIN dbo.S_ACT_EMP T31 ON T1.OWNER_PER_ID = T31.EMP_ID AND T1.ROW_ID = T31.ACTIVITY_ID 
      LEFT OUTER JOIN dbo.S_PARTY T32 ON T31.EMP_ID = T32.ROW_ID 
      LEFT OUTER JOIN dbo.S_CONTACT_FNX T33 ON T31.EMP_ID = T33.PAR_ROW_ID 
      LEFT OUTER JOIN dbo.S_USER T34 ON T31.EMP_ID = T34.PAR_ROW_ID 
      LEFT OUTER JOIN dbo.S_CON_ADDR T35 ON T1.TARGET_OU_ADDR_ID = T35.ADDR_PER_ID AND T1.TARGET_OU_ID = T35.ACCNT_ID 
      LEFT OUTER JOIN dbo.S_ADDR_PER T36 ON T1.TARGET_OU_ADDR_ID = T36.ROW_ID 
    WHERE 
     ((T1.APPT_REPT_REPL_CD IS NULL) AND 
     ((T1.TEMPLATE_FLG != N'Y' AND T1.TEMPLATE_FLG != N'P' OR T1.TEMPLATE_FLG IS NULL) AND (T1.OPTY_ID IS NULL OR T9.SECURE_FLG = N'N' OR T17.OPTY_ID IS NOT NULL)) AND 
     (T1.PRIV_FLG = 'N' OR T1.PRIV_FLG IS NULL OR T1.OWNER_PER_ID = '1-K6JK')) AND 
     (T1.ROW_ID = '1-Y95E') 

Answer 1

コンバージョンを高速化する方法があるかどうかを尋ねていますか？いいえ、答えは...そうでなければ、なぜ彼らはこれをより速い方法でデフォルトにしないのでしょうか？

なぜすべての列を変換していますか？あなたはそれがシステム生成されていると言います...どのシステムがそれを生成するのですか？テーブルのデータ型を正しい型に変更すると、変換は必要ありません。

Answer 2

私は変換関数が理由であるとは思わない。もちろん、いくつかのリソースが必要ですが、それは間違いなく数分かかるでしょう。

変換機能が存在し、それが理由のように見えるかもしれない何らかの理由により、別のプランになる可能性があります。

私は通常、クエリで遅さを引き起こすことができるものを探し始めてお勧めします：

• 良い面と悪いクエリのクエリプランを比較してください。違いがあれば、私たちはあなたを助けることができるかもしれません。
• 、クエリを比較すると
• が起こってブロッキングはありませんことを確認してくださいあなたは、テーブルのような巨大な数を持っているときあなたのケースでは、出力

ioの統計を見て、計画の作成間違いなくタイムアウトすることができます。また、計画の一番左のオペレーターからチェックしてください。 Grant Fritcheyのblog postを参照

ランタイムのみを比較すると、クエリプランが既に存在し、データがキャッシュされているなど、完全に間違った結果になることがあります。時間の比較が正しいことを確認するには、checkpoint、 dbcc dropcleanbuffersおよびdbcc freeprocacheであるが、試験環境のみ。