Find the current execution plan for a sql_id The original was more faster than second, but optimizer use second Before fixing a baseline, identify which execution plan is currently being used
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Check if a sql plan baseline already exists
To check if a sql plan baseline exists for this sql
Also we can use below query to find the plan details based on signature. There are few situations where we know the execution plan of a particular query can be improved with use of proper hint, but if we are not allowed to change the application query in any way (we can’t even add a hint also),then how to achive this? The sql id is a hash of the text of the sql statement Similarly, the hash_value is a hash of the statement itself
You expect these to be the same every time you run a statement The plan_hash_value is a hash of the execution plan This will change if you get a different plan. If yes, the sql plan baseline is purged automatically if it is not used for a period of time
Used to amend the sql plan name, up to a maximum of 30 character.
If you have pinned or preserved the execution plan for the sql using stored outlines etc., also known as plan stability, then you need to remove it, so that oracle would be able to find a proper execution plan in it's next execution. To solve this mystery, you need a time machine You need to see not only the plan the query is using now but also the plan it was using before the trouble started Luckily, oracle database 19c provides the tools to do just that
All you need is the query’s unique identifier In this post we will discuss creating sql baseline and force query to use better execution plan (plan hash value) Steps to create and fix bad query by creating sql baseline are as below. Detect and analyze changes in sql execution plans in oracle
If you would like to find out change in sql plan of a query, below script will help you find the sql plan id for previous executions and check if there is any change in sql plan id.
Hi, in my 11.2 database i've seen that a sql_id change hash plan value
