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blog.jooq.org | ||
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jonathanlewis.wordpress.com
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| | | | | [More on dbms_xplan.display_cursor()] If you're using 9i and haven't learned about the dbms_xplan package, then you should take a good look atit right away. It's(usually) a much better wayof getting execution plans from your system thanwriting yourown queries against the plan_table. If you'vebeen using dbms_xplan, and upgraded from 9i to 10g, make sure that you... | |
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tanelpoder.com
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| | | | | On Exadata (or when setting cell_offload_plan_display = always on non-Exadata) you may see the storage() predicate in addition to the usual access() and filter() predicates in an execution plan: SQL> SELECT * FROM dual WHERE dummy = 'X'; D - X Check the plan: SQL> @x Display execution plan for last statement for this session from library cache... PLAN_TABLE_OUTPUT ------------------------------------------------------------------------------------------------------------------------ SQL_ID dtjs9v7q7zj1g, child number 0 ------------------------------------- SELECT * FROM dual WHERE dummy = 'X' Plan hash value: 272002086 ------------------------------------------------------------------------ | Id | Operation | Name | E-Rows |E-Bytes| Cost (%CPU)| ------------------------------------------------------------------------ | 0 | SELECT STATEMENT | | | | 2 (100)| |* 1 | TABLE ACCESS STORAGE FULL| DUAL | 1 | 2 | 2 (0)| ------------------------------------------------------------------------ Predicate Information (identified by operation id): --------------------------------------------------- 1 - storage("DUMMY"='X') filter("DUMMY"='X') The access() and filter() predicates come from the corresponding ACCESS_PREDICATES and FILTER_PREDICATES columns in V$SQL_PLAN. But there's no STORAGE_PREDICATES column there! - Linux, Oracle, SQL performance tuning and troubleshooting - consulting & training. | |
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tonyhasler.wordpress.com
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| | | | | When a table is accessed by multiple members of a parallel query server set, the execution plan may show the use of block range granules (PX BLOCK ITERATOR) or partition granules (PX PARTITION [RANGE|LIST|HASH] ITERATOR or PX PARTITION [RANGE|LIST|HASH] ALL). The basic ideas surrounding these concepts are discussed in numerous blogs and books, including my... | |
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bleistift.blog
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| | | A blog with information about and reviews of pencils (wood cased pencils and mechanical pencils), sharpeners and other stationery. | ||
