SQL调优

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SQL调优
Teradata's mPP Architecture access,FTS。 eby EMPLOYEE Table DEPARTMENT Table JoB Table Parsing Engine Message Passing Layer AMP 1 AMP 2 AMP 3 AMP 4 EMPLOYEE ROWS EMPLOYEE ROWS EMPLOYEE ROWS EMPLOYEE ROWS DEPART MENT ROWS DEPARTMENT ROWS DEPARTMENT ROWS DEPARTMENT ROWS JOB ROWS JoB ROWS JoB RoWS JOB ROWS eby Join columns are from the same domain No Redistribution needed SELECT T2 FROM Table1 t1 A A INNER JOIN Table2 t2 P ON TLAET2A. 100214433 100725002 Join columns are from the same domain Redistribution needed SELECT T3 TA FROM Table3 t3 A A INNER JoIN Table4 t4 P ON T3A=T4. B 255345225 867255566 SPOOL A P 867255566 eby Join Join Column Column Hash Hash A3 Data Data B8 Data A3 Data C4 Data A3 Data B7 Data B7 Data C4 Data C4 Data eby Join column Hash Join c。lumn Data Hash A3 Data Data C6 Data B8 Data F6 Data 〖c4 Data B7 Data Cache Memory C4 Data A3 Data eby Data Data Data Data Data Data Data Data Data Data eby 234567891011121314151617181920212223242526272829303132 eby DBQLogTbl DBQLSqITbl For ingⅳidua/ Holds full SQL text queries. query origination start, stop and other timings. DBQLObiTbl error codes, tasm data Tracks usage of data base objects SQL (truncated (tables, columns, indexes CPU AND I/O values database etc) DBQLStepTbl DBQLSummary Tbl query step timings, row Populated by Summary counts, CPU and I/O, step or Threshold Logging: actions, etc short known work username acct DBQLExplain Tbl aggregated Holds full EXPLAIN text response time, CPU I/O, and DBQLXMLTBL query counts Holds optimizer query plans as XML documents eby

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