The excerpt from "Migration Guide To Firebird 3" is devoted to testing applications for the compatibility, after the database migration, using HQbird Standard tool: FBScanner. Changing from one Firebird version to another can cause problems with existing queries, ranging from bad performance to total failure when queries use newly reserved words or incorrect SQL that had been accepted.
HQbird FBScanner from IBSurgeon is a tool that can help you check that existing applications work with Firebird 3 and find out if there are errors or slowness in SQL queries of migrating applications.
Read more here.
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