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Ken Koellner @ Engageware Index used in SOQL query with leading % in Like showplan
There are a number of resources that state that SOQL queries will not use an index when the LIKE operator is used if the value includes a leading "%" (some resources simply say contains "%").
I tried it and it appears to be indexing. See the example below. I'm using the value "%inc.com%" on the Contact.email field and it is indexed.
Does anyone knows where UP-TO-DATE documentation is on when SOQL indexes? Many blogs are out of date.
14:38:44.0 (2411702)|SOQL_EXECUTE_BEGIN|[1]|Aggregations:0|SELECT Id FROM Contact WHERE email LIKE '%inc.com%' 14:38:44.0 (51660495)|SOQL_EXECUTE_EXPLAIN|[1]|Index on Contact : [Email], cardinality: 166, sobjectCardinality: 132480, relativeCost 0.071 14:38:44.0 (51677498)|SOQL_EXECUTE_END|[1]|Rows:199
These two articles are Salesforce help articles, which might be useful to you.
Please refer to the below links.
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Thanks.