How to Turn a List of Flat Elements into a Hierarchy in Java, SQL, or jOOQ March 24, 2023.How to Pass a Table Valued Parameter to a T-SQL Function with jOOQ April 25, 2023.How to Write a Multiplication Aggregate Function in SQL.How SQL DISTINCT and ORDER BY are Related.Using Testcontainers to Generate jOOQ Code.Avoid Using COUNT() in SQL When You Could Use EXISTS().jOOQ 3.15's New Multiset Operator Will Change How You Think About SQL. ![]() Using IGNORE NULLS With SQL Window Functions to Fill Gaps.SQL IN Predicate: With IN List or With Array? Which is Faster?.Selecting all Columns Except One in PostgreSQL.Say NO to Venn Diagrams When Explaining JOINs.A Probably Incomplete, Comprehensive Guide to the Many Different Ways to JOIN Tables in SQL.Join 2,119 other subscribers Top Posts & Pages But again, you’re doing this because you want to save money, and that’s better than just staring at the JMX console or throwing random thread dumps around your console.įor more information, visit the following website: JMC isn’t quite as powerful yet as JProfiler or YourKit. Now, profilers cost some money and if money for the license is an issue for you, then there is good news! Since JDK 7u40, Oracle now ships their Oracle Java Mission Control (JMC) for its Hotspot VM and you can use it for free in development environments (not in production). So the fix was applied and we profile again: After… Yay!Īs you can see, the RecordMapper.map() is now using up most of the CPU time (the whole thing accelerated from 134 seconds down to 1.4 seconds in a benchmark) ![]() No way should it gobble up 96% of the benchmark. The DefaultRecordMapperProvider.provide() method is really just boring initialisation. I’ll spare you the details about the fix, but the RecordMapper.map() method is where the magic happens. Do you profile your code using JProfiler or YourKit? You should, because their licenses are worth every penny when you can find a very hidden and subtle bottleneck deep down in your application.įor instance, the following chart shows nicely that there was a significant performance issue in jOOQ related to reflection: Before…
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