Example 12-11 Full Partition-Wise Join CREATE TABLE dept_hash PARTITION BY HASH(department_id) PARTITIONS 3 PARALLEL 2 AS SELECT * FROM departments; EXPLAIN PLAN FOR SELECT /*+ PQ_DISTRIBUTE(e NONE NONE) ORDERED */ e.last_name, I created a user MNASH and created a PLAN_TABLE in MNASH's schema using $ORACLE_HOME/rdbms/admin/utlxplan.sql. SQL> select count(*) from sys.plan_table$; COUNT(*) ---------- 0 SQL> select count(*) from mnash.plan_table; COUNT(*) ---------- 2 SQL> select count(*) from plan_table; COUNT(*) ---------- 2 SQL> However, if I change my current Logged in as ‘GARY' (uid 40), I switch scheme to HR (uid 33). http://sonoportal.net/error-cannot/error-cannot-fetch-last-explain-plan-from-plan-table-dbms-xplan.html
Report message to a moderator Re: Explain Plan [message #237669 is a reply to message #237668] Tue, 15 May 2007 07:46 Frank Messages: 7880Registered: March 2000 Senior Member The TO ROWIDS option generates the rowids necessary for the table access. Join the community of 500,000 technology professionals and ask your questions. The row source tree is the core of the execution plan. https://oraganism.wordpress.com/2010/01/08/explain-plan-for-anomaly/
For example: EXPLAIN PLAN FOR SELECT last_name FROM employees; This explains the plan into the PLAN_TABLE table. For hash partitions, the row source name is PARTITION HASH. HASH JOIN (These are join operations.) Operation joining two sets of rows and returning the result.
NESTED LOOPS OUTER Nested loops operation to perform an outer join statement. Security Model This package runs with the privileges of the calling user, not the package owner (SYS). Refer to Table 12-1 for valid values of partition start and stop. MAT_VIEW REWITE ACCESS HASH Retrieval of rows from materialized view based on hash cluster key value.
Used when the statement contains an ORDER BY clause. Create Plan Table Possible values for PARTITION_START and PARTITION_STOP are NUMBER(n), KEY, ROW REMOVE_LOCATION (MAT_VIEW REWRITE ACCESS only), and INVALID. The PARTITION HASH row source appears on top of the join row source in the plan table output. https://www.experts-exchange.com/questions/28897774/Error-cannot-fetch-last-explain-plan-from-PLAN-TABLE.html From the text of a SQL statement, TKPROF cannot determine the types of the bind variables.
If NULL is specified it also defaults to PLAN_TABLE. For example, '-PROJECTION' excludes projection information. The keyword LAST can be specified to see only the statistics for the last execution. BITMAP MINUS Subtracts bits of one bitmap from another.
OBJECT_INSTANCE NUMERIC Number corresponding to the ordinal position of the object as it appears in the original statement. Search Authors Ben ThompsonNon-working logon trigger on Data Guard standbydatabaseINS-30502: No ASM disk groupfoundDBD::Oracle module forPerl Eter PaniHow Eter Pani became Oracle CertifiedMasterOracle Dictionary fragmentationNOLOGGING in numbers Jean-Christophe DAUCHYGrants to retrieveSQL_MONITOROracle Error Cannot Fetch Plan For Statement_id Autotrace In our case the partition name is equal to the partition key. filter_preds SQL filter predicate(s) to restrict the set of rows selected from the table where the plan is stored.
NESTED LOOPS (These are join operations.) Operation accepting two sets of rows, an outer set and an inner set. http://sonoportal.net/error-cannot/error-cannot-fetch-plan-for-statement-id.html RUNSTATS_LAST - Same as IOSTATS LAST, that is, displays the runtime statistics for the last execution of the cursor Format keywords can be prefixed by the sign '-' to exclude the FROM ROWIDS converts the rowids to a bitmap representation. Pruning, parallel and predicate information are only displayed when applicable.
Mark all read Contact Us · · Top Generated in 0.008 seconds in which 0.002 seconds were spent on a total of 3 queries. Hence, there is no need to purge the plan table after each EXPLAIN PLAN. As a result, the table access row source accesses subpartitions 1 to 15. Source This join method is useful for joining large data sets of data (DSS, Batch).
In that case, you must supply a reference to the child cursor to the table function. The following two formats are deprecated but supported for backward compatibility: RUNSTATS_TOT - Same as IOSTATS, that is, displays IO statistics for all executions of the specified cursor. Example 12-8 EXPLAIN PLAN with Bitmap Indexes EXPLAIN PLAN FOR SELECT * FROM t WHERE c1 = 2 AND c2 <> 6 OR c3 BETWEEN 10 AND 20; SELECT STATEMENT TABLE
Just turn it off. See Table 12-2 for more information on the possible values for this column. PLAN_ID NUMBER Unique identifier of a plan in the database. QC (RANDOM) The QC consumes the input randomly.
Your first 5 minutes are always free. The statement in Example 12-4 displays the execution plans. TYPICAL: This is the default. http://sonoportal.net/error-cannot/error-cannot-fetch-last-explain-plan-from-plan-table.html For finer control on the display output, the following keywords can be added to the above three standard format options to customize their default behavior.
Displaying a Cursor Execution Plan Using DBMS_XPLAN.DISPLAY_CURSOR By default, the table function DISPLAY_CURSOR formats the execution plan for the last SQL statement executed by the session. In addition to the explain plan, various plan statistics (such as. MAT_VIEW REWITE ACCESS BY LOCAL INDEX ROWID If the materialized view is partitioned and rows are located using one or more local indexes and possibly some global indexes. The results also help you to understand the optimizer decisions, such as why the optimizer chose a nested loops join instead of a hash join, and lets you understand the performance
If omitted, the table function will return all stored execution plans for a given SQL_ID. All statistics, except the number of output rows, are cumulative. I have the following statement that I would like an explain plan for: explain plan set statement_id = 'HIL:test1' for select wdj.wip_supply_type, djd.analyse_shortage from wip_discrete_jobs wdj, wip_discrete_jobs_dfv djd where wdj.rowid = COST NUMERIC Cost of the operation as estimated by the optimizer's query approach.
Table 12-3 lists each combination of OPERATION and OPTIONS produced by the EXPLAIN PLAN statement and its meaning within an execution plan. ALLSTATS - A shortcut for 'IOSTATS MEMSTATS' LAST - By default, plan statistics are shown for all executions of the cursor. PARALLEL_COMBINED_WITH_PARENT (PWP): Parallel execution; Output of step goes to next step in same parallel process. BYTES NUMERIC Estimate by the query optimization approach of the number of bytes accessed by the operation.
HASH Maps rows to query servers using a hash function on the join key. This chapter contains the following topics: Using DBMS_XPLAN Overview Security Model Examples Summary of DBMS_XPLAN Subprograms Using DBMS_XPLAN Overview Security Model Examples Overview The DBMS_XPLAN package supplies four table functions: DISPLAY Includes information displayed with the TYPICAL level with additional information (PROJECTION, ALIAS and information about REMOTE SQL if the operation is distributed). Its definition is similar to the PLAN_TABLE.
This parameter defaults to NULL in which case the plan of the last cursor executed by the session will be displayed. OPTIONS VARCHAR2(225) A variation on the operation described in the OPERATION column. The PX SEND and PX RECEIVE row sources represent the pipe that connects the two slave sets as rows flow up from the parallel scan, get repartitioned through the HASH table This enables use of full partition-wise join.
QBLOCK_NAME VARCHAR2(30) Name of the query block, either system-generated or defined by the user with the QB_NAME hint. reports) running on a table, when gains from effective execution plan prevail over the loses of dynamic sql. For finer control on the display output, the following keywords can be added to the above three standard format options to customize their default behavior. MEMSTATS - Assuming that PGA memory management is enabled (that is, pga_aggregate_target parameter is set to a non 0 value), this format allows to display memory management statistics (for example, execution
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