特殊情況如下
客戶的統計資訊是固定的,沒辦法收集統計資訊 。
sql profile 是最後考慮方案,因為同樣寫法sql 比較多,幾十條。
parallle 並行客戶一般不考慮接受,oltp 系統。
最好使用hint .
無法收集統計資訊,怎樣優化sql。
首先在dev 環境收集統計資訊,通過sqlhc ,收取結果。
其次使用收集資訊的outline ,來代入,調優
結果如下:
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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