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Showing posts from July, 2022

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Query to check the latest Materialized View refresh time and type

on July 23, 2022

last mivew refresh materialzied view +3 mivew mview refresh date mview refresh type Oracle oracle database select query

last mivew refresh materialzied view mivew mview refresh date mview refresh type Oracle oracle database select query

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Oracle long running query Performance Tunning

In this post, I'll be explaining the long-running concurrent program issue we have faced in one of our instance. The issue was with Oracle Remove Person Program ran for three and half hours to delete one person record. When the customer reported the issue, I checked the AWR report and found that one particular SQL was running for nearly three hours. Since the SQL dictates more than 74% of the runtime of the concurrent program I will be discussing how I tunned the query to make it run in 16 mins from nearly 3 hours. As a usual step, I have checked for the alternate hash plan using the queries in the link . But there are no other hash plans available in the database for the particular SQL id. So my next hope was on automatic SQL tuning advisor and even it didn't have any action plan for the particular sql_id. SQL ID : bxjnvubgufs6m SQL Text : UPDATE HZ_CUST_SITE_USES_ALL SET LOCATION=NVL2(LOCATION,PER_DRT_UDF.GENERATE_UNIQUE_STRING(ROWID,' ...

Script to run the Sql tuning advisor from backend

Most of the time we will be in situation to tune a long running query to increase the performance. One of easiest way to do that is to run the sql tuning advisor and implement the suggestion.Let us discus about the easiest way of running the sql tuning advisor in the back-end. You can find the sql tuning advisor script in the following directory. Copy $ORACLE_HOME/rdbms/admin/sqltrpt.sql Once you run the above sciprt it wil ask you for the sql_id for which you wanna run the tuning advisor.Provide the sql_id and wait sometime as it takes 5-10 minutes to create and run the tuning task.Most of the time suggestion would be either index or sql profile. Please find the example for sql profile suggestion. 1- SQL Profile Finding (see explain plans section below) -------------------------------------------------------- A potentially better execution plan was found for this statement. Recommendation (estimated benefit: 99.96%) ------------------------------------------ - Consider ...

Oracle Standby Important queries

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Troubleshooting oracle long running request - Performance tuning

The most common issue faced by all the oracle apps dba is a long-running concurrent program. Let us discuss the different approaches to troubleshoot the long-running oracle concurrent program. Step 0: Check the request Check how long the program has been running and also check the previous run of the same program to get an idea about how long it should be running. Use the Query from the Post ( Current running Concurrent Program ). The query shows the result of current running concurrent programs with the previous runtime. Step 1: Request id to SID The first step of troubleshooting a long-running concurrent program is to find the sid of the concurrent program. Please use the below query to find the sid of the concurrent program. Request id to SID query : Copy SELECT a.request_id, s.sid, s.serial#, s.osuser, s.process, c.spid FROM apps.fnd_concurrent_requests a, apps.fnd_concurrent_processes b, v$process c, v$session s...

Important Queries for cloning

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