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                EXPLAIN作為db2的查詢計劃,一般情況下需要自己打開,可是一般都是運行db2 -tvf EXPLAIN.DDL可是我運行了很多次都是錯誤的 ![](https://box.kancloud.cn/2016-02-23_56cbb4c37f1db.jpg) 因為不在同一個目錄,就會有錯誤。 應該這樣寫:db2 -tvf "C:\Program Files (x86)\IBM\SQLLIB\MISC\EXPLAIN.DDL" EXPLAIN.DDL的默認目錄在C:\Program Files (x86)\IBM\SQLLIB\MISC\下,沒在同一個目錄就會有錯誤。 但有時還是會有錯誤,實際上這句執行很多SQL,創建不少表。如果發現問題,可以刪除對應的表和索引。 刪除對應的表索引,試圖 ~~~ db2 drop TABLE EXPLAIN_ACTUALS db2 drop FUNCTION EXPLAIN_GET_MSGS db2 drop INDEX PRT_I1 db2 drop INDEX MQT_I2 db2 drop INDEX MQT_I1 on ADVISE_MQT db2 drop INDEX IDX_I2 db2 drop INDEX IDX_I1 db2 drop INDEX EXP_DIAG_DAT_I1 db2 drop INDEX OBJ_I1 db2 drop INDEX STM_I1 db2 drop INDEX PRD_I1 db2 drop INDEX ARG_I1 db2 drop INDEX STMT_I1 db2 drop TABLE ADVISE_TABLE db2 drop TABLE ADVISE_PARTITION db2 drop TABLE ADVISE_MQT db2 drop TABLE ADVISE_WORKLOAD db2 drop TABLE ADVISE_INDEX db2 drop TABLE ADVISE_INSTANCE db2 drop TABLE OBJECT_METRICS db2 drop TABLE EXPLAIN_DIAGNOSTIC_DATA db2 drop TABLE EXPLAIN_DIAGNOSTIC db2 drop TABLE EXPLAIN_STREAM db2 drop TABLE EXPLAIN_PREDICATE db2 drop TABLE EXPLAIN_OPERATOR db2 drop TABLE EXPLAIN_OBJECT db2 drop TABLE EXPLAIN_ARGUMENT db2 drop TABLE EXPLAIN_STATEMENT db2 drop TABLE EXPLAIN_INSTANCE ~~~ 重新創建相應的表索引,視圖 db2 -tvf "C:\Program Files (x86)\IBM\SQLLIB\MISC\EXPLAIN.DDL" >d:\22.txt
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