The EXPLAIN PLAN statement displays execution plans chosen by the Oracle optimizer for SELECT, UPDATE, INSERT, and DELETE statements. A statement's execution plan is the sequence of operations Oracle performs to run the statement. The row source tree is the core of the execution plan. It shows...
If you create new indexes to tune a statement that is currently parsed, then Oracle invalidates the statement. When the statement is next executed, the optimizer automatically chooses a new execution plan that could potentially use the new index. If you create new indexes on a remote database...
■ After issuing the EXPLAIN PLAN statement, use one of the scripts or package provided by Oracle to display the most recent plan table output. See "Displaying PLAN_TABLE Output" on page 19-5.(使用SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY(NULL, '语句名字'))进行执行计划的结果的展示) ■ The...
Computer science departments should offercomputer science educationWe obviously need lots of people who know computer science, including many professional software developers. But most people who program will not be computer science majors (e.g., seethis 2017 Oracle study). The needs forcomputing educ...
processing or executing that query, which are often more efficient than the original SQL statement would allow. the majority of Oracle's query transactions are nowcost-based, which means the Optimizer will cost the plan with and with the query transformation and pick the plan with the lowest ...
Your goals are to recognize the aspects of the EXPLAIN plan that indicate a query is optimized well, and to learn the SQL syntax and indexing techniques to improve the plan if you see some inefficient operations. PREV HOME UP NEXT © 2025 Oracle ...
Migrating to Schema 2 is imperative if you plan to install Calendar Server with other Sun Java System products in the future. Supported Provisioning Tools Schema 1 supports LDAP provisioning tools. For more information, seeUnderstanding Calendar Server Provisioning Tools. ...
8.8.2 EXPLAIN Output Format 8.8.3 Extended EXPLAIN Output Format 8.8.4 Obtaining Execution Plan Information for a Named Connection 8.8.5 Estimating Query Performance Depending on the details of your tables, columns, indexes, and the conditions in yourWHEREclause, the MySQL optimizer considers many ...
In theory, using the conformance testing techniques as equivalence oracle can learn a complete model. However, this requires the number of states of the SUL to be known. Yet for legacy systems, the (exact) behavior of SUL is unknown. Therefore, in practice an estimation of the number of ...
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