Re: Last query execution time Mohamed Mansour June 29, 2006 01:24AM Sorry, you can't reply to this topic. It has been closed. Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent th...
比如在上述的例子中,join顺序中departments表必须在emplyees表之前,但是我们可以通过在employees表选择的列上应用一个distinct算子将这个semi join转换成inner join从而解除这一限制,这使得(d semi jon e)以及(distinct(e)join d)这两种join顺序都可以在优化器中考虑,在Oracle中,这个转换被集成到了物理优化阶段。 所有...
From the Applications Manager GUI, Go to respectiveOracle Monitor's details page->Monitor Actions->Edit Monitor-> Increase the seconds mentioned in "Query Execution Timeout" field. If the alert is Socket read timed out alert then From the Applications Manager GUI, Go to respectiveOracle ...
Asynchronous Oracle Query Execution in .NET dotConnect for Oracle supports a very useful feature - asynchronous execution of methods that take most of time in database applications. Traditionally, the main thread of the application went blocked during opening a connection, transferring large blocks of...
当然Oracle也有现在已经很主流的runtime filter、dynamic partition pruning。被用在join中可以下推到in-memory table的scan算子中来进一步过滤数据,避免不必要的stitching和物化。 Hybrid Data Access 这个算是paper中比较有意思的点,前面已经提到in-memory data可能只是table中的一部分,或者对一个分区表来说,部分分区有...
When you run this utility to generate metadata for Oracle Database, the utility is called the Oracle Database Metadata Generator. The Oracle BI Server export utility works with the following tools: In the Oracle Database, the SQL Access Advisor creates materialized views and index recommendations ...
This chapter describes ways to improve Oracle Business Intelligence query performance, including a performance tuning overview and information about monitoring system metrics.
Then the query re-write mechanism in the Oracle server will automatically re-write the SQL query to use the materialized views. Thus Oracle Materialized Views & Query Rewrite Page 3 resulting in a significant improvement in query response time and eliminating the need for the end-user to be '...
Query_time:duration The statement execution time in seconds. Lock_time:duration The time to acquire locks in seconds. Rows_sent:N The number of rows sent to the client. Rows_examined: The number of rows examined by the server layer (not counting any processing internal to storage engines)....
After we execute a statement in mysql, it reports the query execution time in the format: n rows in set (t sec). We may do something like this to get the execution time: $time_start = getmicrotime(); mysql_query( "" ); $time_end = getmicrotime(); $time = $time_end ...