Run a query with a distinctive comment: SELECT /* TOTO */ ename, dname FROM dept d join emp e USING (deptno); Get sql_id and child_number for the preceding statement: SELECT sql_id, Bookmark the permalink. Usage Notes To use the DISPLAY_CURSOR functionality, the calling user must have SELECT privilege on the fixed views V$SQL_PLAN_STATISTICS_ALL, V$SQL and V$SQL_PLAN, otherwise it will show an appropriate error message. All rights reserved. this contact form
I/O, memory and timing) can be reported (based on the V$SQL_PLAN_STATISTICS_ALL VIEWS). Thanks. I'm talking things like: * Dropping columns * Shrinking allocated space * Removing chained blocks and restoring the PCTFREE * Re-or… Oracle Database Cursor in Oracle Article by: Swadhin Cursors in Identifies a specific stored execution plan for a SQL statement.
But it is not. Here are some ways you might use variations on the format parameter: Use 'ALL -PROJECTION -NOTE' to display everything except the projection and note sections. For example: filter_preds=>'plan_id = 10' Can reference any column of the table where the plan is stored and can contain any SQL construct (for example, sub-query, function calls (see WARNING
If not supplied, the execution plan of all cursors matching the supplied sql_id parameter are displayed. If you are not working in classic Data Warehousing manner you have to care about DML statement performance. sqlset_owner The owner of the SQL tuning set. alter session set cuurent_schema=1; explain plan for / Then when query dbms_xplan use the prefix sys on plan_table ex.: SELECT PLAN_TABLE_OUTPUT FROM TABLE(DBMS_XPLAN.DISPLAY(‘SYS.PLAN_TABLE', NULL,'ALL')); I hope that help.
What is the difference between Mean Squared Deviation and Variance? Oracle Create Plan Table Draw an ASCII chess board! If anyone can explain why/how EXPLAIN PLAN FOR doesn't see itself as running in the "CURRENT_SCHEMA"/"SESSION_SCHEMA" then I'd be very interested to know. https://oraganism.wordpress.com/tag/explain-plan/ Syntax DBMS_XPLAN.DISPLAY( table_name IN VARCHAR2 DEFAULT 'PLAN_TABLE', statement_id IN VARCHAR2 DEFAULT NULL, format IN VARCHAR2 DEFAULT 'TYPICAL', filter_preds IN VARCHAR2 DEFAULT NULL); Parameters Table 132-2 DISPLAY Function Parameters Parameter Description table_name
These statistics only apply to memory intensive operations like hash-joins, sort or some bitmap operators. TYPICAL: This is the default. What are the drawbacks of the US making tactical first use of nuclear weapons against terrorist sites? According to optimizer estimations we can save 14 minutes on it.
SQL> select sys_context('userenv','session_user') username 2 , sys_context('userenv','current_schema') schema from dual; USERNAME SCHEMA ---------- ---------- MNASH SCOTT SQL> explain plan for 2 select * from dual; Explained. SERIAL: Like TYPICAL except that the parallel information is not displayed, even if the plan executes in parallel. Error Cannot Fetch Plan For Statement_id Autotrace Hence, there is no need to purge the plan table after each EXPLAIN PLAN. Syntax DBMS_XPLAN.DISPLAY_SQLSET( sqlset_name IN VARCHAR2, sql_id IN VARCHAR2, plan_hash_value IN NUMBER := NULL, format IN VARCHAR2 := 'TYPICAL', sqlset_owner IN VARCHAR2 := NULL) RETURN DBMS_XPLAN_TYPE_TABLE PIPELINED; Parameters Table 132-5 DISPLAY_SQLSET Function
Using the logon schema rather than current_schema would allow you to use AUTOTRACE if you didn't have privileges on the plan_table of the current_schema Reply Martin Nash says: January 9, 2010 http://birdsallgraphics.com/error-cannot/error-cannot-fetch-platform-build.php Includes information displayed with the TYPICAL level with additional information (PROJECTION, ALIAS and information about REMOTE SQL if the operation is distributed). I've just looked at the UIDs and see the differing values for the "explain plan for" and "insert into plan_table" statements. format Controls the level of details for the plan.
Join them; it only takes a minute: Sign up How to create EXPLAIN_PLAN table on Amazon RDS database? If NULL is specified it also defaults to PLAN_TABLE. If not supplied, the database_id of the local database will be used, as shown in V$DATABASE. navigate here TYPICAL: This is the default.
Use 'BASIC ROWS' to display basic information with the additional number of rows estimated by the optimizer. Join our community for more solutions or to ask questions. Displays the most relevant information in the plan (operation id, name and option, #rows, #bytes and optimizer cost).
Next time express yourself clearly. –zaratustra Sep 2 '14 at 8:09 add a comment| 1 Answer 1 active oldest votes up vote 0 down vote accepted I believe you are referring The child_number can be specified only if sql_id is specified. ALL: Maximum user level. his comment is here If you are using partitions in your application there is fair chance that your database is quite big and performance demanding.
The syntax was developed to support interval partitions but can be handy for all other types. This was in addition to the PUBLIC synonym PLAN_TABLE for the SYS.PLAN_TABLE$ temporary table created by default. Includes information displayed with the TYPICAL level with additional information (PROJECTION, ALIAS and information about REMOTE SQL if the operation is distributed). Featured Post How your wiki can always stay up-to-date Promoted by Quip, Inc Quip doubles as a “living” wiki and a project management tool that evolves with your organization.
The following shows that not only are the plan records written to MNASH.PLAN_TABLE, but PLAN_TABLE is resolved to MNASH.PLAN_TABLE. it was actually part of what you needed to execute. Post navigation ← srvctl -p option srvctl -p option partII → 6 thoughts on “EXPLAIN PLAN FORAnomaly” Gary says: January 9, 2010 at 11:36 am The documentation states "If you omit Logged in as ‘GARY' (uid 40), I switch scheme to HR (uid 33).
The conclusion from two previous axiom is that probably most indexes on partitioned tables in your application is non-prefixed local indexes. Ha-Ha-Ha nothing change we still could not pass partition key values into query. ALL: Maximum user level. Who owns this plan_table?
reports) running on a table, when gains from effective execution plan prevail over the loses of dynamic sql. The following shows that not only are the plan records written to MNASH.PLAN_TABLE, but PLAN_TABLE is resolved to MNASH.PLAN_TABLE. Examples To display the execution plan for the SQL statement associated with SQL ID 'gwp663cqh5qbf' and PLAN HASH 3693697075 in the SQL Tuning Set called 'OLTP_optimization_0405": SELECT * FROM table ( Join the community of 500,000 technology professionals and ask your questions.
ALL: Maximum user level. Includes information displayed with the TYPICAL level with additional information (PROJECTION, ALIAS and information about REMOTE SQL if the operation is distributed). This parameter defaults to NULL in which case the plan of the last cursor executed by the session will be displayed. 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
The usage of this syntaxes have sense only in case of big queries (e.g. Usage Notes Here are some ways you might use variations on the format parameter: Use 'ALL -PROJECTION -NOTE' to display everything except the projection and note sections.