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How do I optimize SOQL performance?
Custom indexes, when used improperly, can actually slow query results. It’s best to create filter conditions that are selective so Force.com scans only the rows necessary in the objects your queries target.
How do I make a query selective in SOQL?
Example:
- Get the SOQL query and replace the list of fields with the count() operator:
- Check the number of active records in the table:
- The only filter in the WHERE clause with an index is CreatedDate, so we will only consider the filter on this field.
- Let’s check though if the filter on Status__c is selective:
What is Salesforce Query Optimizer?
The Force.com Query Optimizer Like most cost-based query optimizers, the one that Salesforce uses relies on statistics gathered about the data. Most statistics are gathered weekly, but the system also generates pre-queries that are cached every hour. The Query Optimizer evaluates SOQL queries and SOSL searches.
How can you check the performance of a query in Salesforce?
How to check SOQL performance?
- Go to Developer Console.
- Navigate to Debug –> View Log Panels…
- Select Execution Stack.
How do I solve SOQL 101?
Resolve the “Too many SOQL queries: 101” error To fix the issue, change your code so that the number of SOQL fired is less than 100. If you need to change the context, you can use @future annotation which will run the code asynchronously.
What is indexing in SOQL query?
When a field is indexed, its values are stored in a more efficient data structure. This takes up more space but improves performance when at least two filters with indexed fields are used in a query. Fields that are indexed by default include: Primary keys: Id, Name, Owner, Email (contacts, leads)
What is query plan in Salesforce?
Use the Query Plan tool to optimize and speed up queries done over large numbers of records. View query plans for SOQL queries, SOSL searches, reports, and list views. If custom indexes are available for your organization, use query plans to help you decide when to request a custom index from Salesforce Support.
Which is faster SOSL or SOQL?
Both SOQL WHERE filters and SOSL search queries can specify text you should look for. When a given search can use either language, SOSL is generally faster than SOQL if the search expression uses a CONTAINS term.
In which cases do you use SOSL queries?
Each language has a distinct use case:
- Use SOQL to retrieve records for a single object.
- Use SOSL to search fields across multiple objects. SOSL queries can search most text fields on an object.
How can I Optimize my SQL Server query?
It is created by SQL Server query optimizer, and provides you with information on how a query will be executed and show you all individual actions that constitute this query. MS SQL Management Studio provides two ways to view Execution Plan: text and graphical. 3.1.
How is execution plan used to optimize SQL?
Execution plan also can show you missing indexes that could improve performance and thus optimize SQL query. It would look like this: Apart from showing the index that needs to be added, plan also shows what kind of effect we will get from it. In this case, it will increase performance on 38%.
What are some tips and tricks for SQL Server?
Tips and tricks. SQL Server can efficiently filter a data set using indexes via the WHERE clause or any combination of filters that are separated by an AND operator. By being exclusive, these operations take data and slice it into progressively smaller pieces, until only our result set remains. OR is a different story.
How are query times reduced in SQL Server?
The execution plan got significantly more complex, as we are querying each table twice now, instead of once, but we no longer needed to play pin-the-tail-on-the-donkey with the result sets as we did before. The reads have been cut down from 1.2 million to 750, and the query executed in well under a second, rather than in 2 seconds.