特殊情况如下

  1. 客户的统计信息是固定的，没办法收集统计信息 。
  2. SQL profile 是最后考虑方案，因为同样写法sql 比较多，几十条。
  3. Parallle 并行客户一般不考虑接受，OLTP 系统。
  4. 最好使用hint .

无法收集统计信息，怎样优化SQL。

首先在dev 环境收集统计信息，通过SQLHC ，收取结果。

其次使用收集信息的outline ,来代入，调优

结果如下：

SELECT

/*+

                            BEGIN_OUTLINE_DATA

                            IGNORE_OPTIM_EMBEDDED_HINTS

                            OPTIMIZER_FEATURES_ENABLE('11.2.0.4')

                            DB_VERSION('11.2.0.4')

                            ALL_ROWS

                            OUTLINE_LEAF(@"SEL$7286615E")

                            MERGE(@"SEL$5")

                            OUTLINE_LEAF(@"SEL$335DD26A")

                            MERGE(@"SEL$3")

                            OUTLINE_LEAF(@"SEL$E9CE8D49")

                            MERGE(@"SEL$07C48A2D")

                            OUTLINE_LEAF(@"SEL$B584FDD1")

                            MERGE(@"SEL$29F99543")

                            OUTLINE_LEAF(@"SEL$201A8568")

                            MERGE(@"SEL$10")

                            MERGE(@"SEL$11")

                            MERGE(@"SEL$12")

                            MERGE(@"SEL$13")

                            MERGE(@"SEL$6")

                            MERGE(@"SEL$7")

                            MERGE(@"SEL$8")

                            MERGE(@"SEL$9")

                            OUTLINE(@"SEL$4")

                            OUTLINE(@"SEL$5")

                            OUTLINE(@"SEL$2")

                            OUTLINE(@"SEL$3")

                            OUTLINE(@"SEL$17")

                            OUTLINE(@"SEL$07C48A2D")

                            MERGE(@"SEL$19")

                            OUTLINE(@"SEL$14")

                            OUTLINE(@"SEL$29F99543")

                            MERGE(@"SEL$16")

                            OUTLINE(@"SEL$1")

                            OUTLINE(@"SEL$10")

                            OUTLINE(@"SEL$11")

                            OUTLINE(@"SEL$12")

                            OUTLINE(@"SEL$13")

                            OUTLINE(@"SEL$6")

                            OUTLINE(@"SEL$7")

                            OUTLINE(@"SEL$8")

                            OUTLINE(@"SEL$9")

                            OUTLINE(@"SEL$18")

                            OUTLINE(@"SEL$19")

                            OUTLINE(@"SEL$15")

                            OUTLINE(@"SEL$16")

                            FULL(@"SEL$201A8568" "CONTAINER"@"SEL$6")

                            INDEX_RS_ASC(@"SEL$201A8568" "LOCN_GP_ACCESS_CTRL_GP_MEMBER"@"SEL$10" ("LOCN_GP_ACCESS_CTRL_GP_MEMBER"."LS_LEVEL_1"

                                    "LOCN_GP_ACCESS_CTRL_GP_MEMBER"."LS_LEVEL_2" "LOCN_GP_ACCESS_CTRL_GP_MEMBER"."LS_LEVEL_3" "LOCN_GP_ACCESS_CTRL_GP_MEMBER"."LS_LEVEL_4"))

                            FULL(@"SEL$201A8568" "SHIPMENT"@"SEL$7")

                            FULL(@"SEL$201A8568" "SHIPMENT_INSTRUCTION"@"SEL$8")

                            NO_ACCESS(@"SEL$201A8568" "RFR"@"SEL$1")

                            FULL(@"SEL$201A8568" "LOCATION_SPACE"@"SEL$13")

                            INDEX_FFS(@"SEL$201A8568" "EMPTY_POOL_CONTAINER"@"SEL$9" ("EMPTY_POOL_CONTAINER"."EMPTY_POOL_CODE" "EMPTY_POOL_CONTAINER"."CNTR_ID"))

                            FULL(@"SEL$201A8568" "CNTR_DAMAGE_DTL"@"SEL$12")

                            FULL(@"SEL$201A8568" "LOCN_GP_ACCESS_CTRL_GP_MEMBER"@"SEL$11")

                            LEADING(@"SEL$201A8568" "CONTAINER"@"SEL$6" "LOCN_GP_ACCESS_CTRL_GP_MEMBER"@"SEL$10" "SHIPMENT"@"SEL$7" "SHIPMENT_INSTRUCTION"@"SEL$8"

                                    "RFR"@"SEL$1" "LOCATION_SPACE"@"SEL$13" "EMPTY_POOL_CONTAINER"@"SEL$9" "CNTR_DAMAGE_DTL"@"SEL$12" "LOCN_GP_ACCESS_CTRL_GP_MEMBER"@"SEL$11")

                            USE_HASH(@"SEL$201A8568" "LOCN_GP_ACCESS_CTRL_GP_MEMBER"@"SEL$10")

                            USE_HASH(@"SEL$201A8568" "SHIPMENT"@"SEL$7")

                            USE_HASH(@"SEL$201A8568" "SHIPMENT_INSTRUCTION"@"SEL$8")

                            USE_HASH(@"SEL$201A8568" "RFR"@"SEL$1")

                            USE_HASH(@"SEL$201A8568" "LOCATION_SPACE"@"SEL$13")

                            USE_HASH(@"SEL$201A8568" "EMPTY_POOL_CONTAINER"@"SEL$9")

                            USE_HASH(@"SEL$201A8568" "CNTR_DAMAGE_DTL"@"SEL$12")

                            USE_HASH(@"SEL$201A8568" "LOCN_GP_ACCESS_CTRL_GP_MEMBER"@"SEL$11")

                            PX_JOIN_FILTER(@"SEL$201A8568" "LOCN_GP_ACCESS_CTRL_GP_MEMBER"@"SEL$11")

                            SWAP_JOIN_INPUTS(@"SEL$201A8568" "LOCN_GP_ACCESS_CTRL_GP_MEMBER"@"SEL$10")

                            SWAP_JOIN_INPUTS(@"SEL$201A8568" "SHIPMENT"@"SEL$7")

                            SWAP_JOIN_INPUTS(@"SEL$201A8568" "SHIPMENT_INSTRUCTION"@"SEL$8")

                            SWAP_JOIN_INPUTS(@"SEL$201A8568" "RFR"@"SEL$1")

                            SWAP_JOIN_INPUTS(@"SEL$201A8568" "LOCATION_SPACE"@"SEL$13")

                            SWAP_JOIN_INPUTS(@"SEL$201A8568" "EMPTY_POOL_CONTAINER"@"SEL$9")

                            SWAP_JOIN_INPUTS(@"SEL$201A8568" "CNTR_DAMAGE_DTL"@"SEL$12")

                            SWAP_JOIN_INPUTS(@"SEL$201A8568" "LOCN_GP_ACCESS_CTRL_GP_MEMBER"@"SEL$11")

                            NO_ACCESS(@"SEL$B584FDD1" "C"@"SEL$14")

                            FULL(@"SEL$B584FDD1" "REEFER_MONITORING_LOG"@"SEL$16")

                            LEADING(@"SEL$B584FDD1" "C"@"SEL$14" "REEFER_MONITORING_LOG"@"SEL$16")

                            USE_HASH(@"SEL$B584FDD1" "REEFER_MONITORING_LOG"@"SEL$16")

                            INDEX_FFS(@"SEL$E9CE8D49" "REEFER_MONITORING_LOG"@"SEL$19" ("REEFER_MONITORING_LOG"."REEFER_HANDLING_CYCLE_MODE"

                                    "REEFER_MONITORING_LOG"."CNTR_ID" "REEFER_MONITORING_LOG"."REEFER_MONITORING_DATETIME"))

                            USE_HASH_AGGREGATION(@"SEL$E9CE8D49")

                            INDEX_RS_ASC(@"SEL$335DD26A" "GATE_LOG"@"SEL$3" ("GATE_LOG"."CNTR_ID" "GATE_LOG"."CMS_NO"))

                            INDEX_RS_ASC(@"SEL$7286615E" "GATE_LOG"@"SEL$5" ("GATE_LOG"."CNTR_ID" "GATE_LOG"."CMS_NO"))

                            END_OUTLINE_DATA

                        */

CNTR.CREATED_BY_OPR_UNIT CREATED_BY_OPR_UNIT,

*********

from

*****.

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