The following illustrates the syntax of the Oracle MERGE statement: MERGE INTO target_table USING source_table ON search_condition WHEN MATCHED THEN UPDATE SET col1 = value1, col2 = value2,... WHERE <update_condition> [DELETE WHERE <delete_condition>] WHEN NOT MATCHED THEN INSERT (col1,co...
In addition to the straightMERGEstatement being faster, because it is a DML statement it can easily be run in parallel to improve performance further, provided your server can handle the extra load. For more information see: Hope this helps. Regards Tim... ...
Use theMERGEstatement to select rows from one or more sources for update or insertion into a table or view. You can specify conditions to determine whether to update or insert into the target table or view. 使用MERGE语句选择行从一个或多个源更新或插入一个表或视图。您可以指定条件来决定是否更...
this is set to 10 seconds. Automatic degree of parallelism is only enabled if PARALLEL_DEGREE_POLICY is set to AUTO or LIMITED. The syntax is:
在以前版本的Oracle数据库中,当您在包含该MERGEINTO语句的应用程序上创建Oracle虚拟专用数据库策略时,由于存在虚拟专用数据库策略,该MERGEINTO语句将被阻止并出现ORA-28132: Merge into syntax does not support security policies错误。从Oracle Database11g第2版(11.2.0.2)开始,您可以在包含MERGEINTO操作的应用程序上创...
One of the topics I’ve found very interesting as I started blogging was the sometimes strange behavior of theMERGEstatement, the reasons forORA-30926and what it has to do with write consistency. My first blog post about it was almost exactly ten years ago. Time for a follow up! Especiall...
There is a more elegant solution, making use of the MERGE statement. The syntax is similar to MERGE in SQL Server so we will use the same UPDATE as in the last example. This should be written like this: MERGE INTO chinook.Invoice ...
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There are times when you want to examine the execution plan for a single statement. In such cases, the EXPLAIN PLAN syntax is appropriate. There are other times when you want to look at the plans for a group of SQL statements. For these situations, you can set up a trace for the stat...
NO_ADAPTIVE_PLAN Syntax:NO_ADAPTIVE_PLAN Description:The NO_ADAPTIVE_PLAN hint instructs the optimizer to automatically change a plan on subsequent executions of a SQL statement. SQL?? HelloDBA.com> alter session set "_optimizer_adaptive_plans"=true; HelloDBA.com> exec sql_explain('select /...