1. Use filters to limit the data returned:
Always apply filters to query only the required data.
SOQL takes longer to run if there is too much data to process.
You can use "WHERE" to filter records based on conditions.
2. Use aggregate queries to perform summary calculations:
Aggregate queries like SUM, AVG, MAX, and MIN, are helpful to derive insights from a large dataset.
3. Use LIMIT clause:
Use the LIMIT clause to limit the number of records returned by a query.
This can help speed up performance and reduce resource usage.
4. Use a subquery to limit the data:
You can use a subquery to limit the number of records returned from a parent object based on the records in a child object.
5. Avoid nesting multiple queries:
Avoid nesting multiple queries, as they can lead to performance issues.
Instead, try to write one query to get all the required data.
6. Use indexing to improve performance:
Creating an index on fields you frequently query can speed up SOQL performance.
Fields with low cardinality, such as picklists, are particularly helpful.
7. Use selective queries:
Selective queries retrieve a small subset of records that match a certain filter condition.
Selective queries are more efficient than non-selective queries and can take advantage of indexing.
8. Avoid using SOQL in loops:
Querying in loops consumes too much of your organization's resources and can cause performance issues.
Instead, try to query all the data you need in one go.
9. Use order by:
Sort your query results using order by to help with navigation.
This will help when querying large datasets.
10. Use governor limits to stay within the limits:
SOQL queries are subject to Salesforce governor limits.
Make sure to understand these limits and optimize your queries to stay within them.
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