Debugging Grails Database Performance
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The document discusses debugging Grails database performance issues. It notes that while GORM provides easy data access from anywhere in a Grails application, this can lead to unclear data access patterns and unintended queries. It then introduces the MVC Mini Profiler tool for tracking database queries and tying them to specific parts of the codebase. The document demonstrates this tool and outlines plans to implement more of its features for Grails and support non-SQL stores.
Debugging Grails Database Performance
- 1. Debugging Grails Database Performance
- 2. Tom Dunstan / @tomdcc [email protected] #ggx LICENSEDUNDERCREATIVECOMMONSBYENERGIZEDWORKLIMITED |HMSPRESIDENT,VICTORIAEMBANKMENT,LONDON,EC40HJ|WWW.ENERGIZEDWORK.COM 2
- 3. ✪ GORM • One of the best parts of Grails • Easy data access • No DAOs etc required • Can access data from anywhere
- 4. ✪ GORM • Can access data from anywhere • This can be dangerous • Many data access patterns can coexist • Difficult to work out what is generating a particular query
- 5. ✪ GORM • Getting data out of collections can have unintended consequences
- 6. ✪ WHERE CAN WE ACCESS DATA? • Filters • URL Mapping Constraints • Controllers • Services • Modules • Named Queries • Helper classes • Views • Tag Libraries
- 7. ✪ WHERE CAN WE ACCESS DATA? • It may not be apparent exactly when data is being fetched
- 8. ✪ SPAGHETTI • Long lived projects can evolve multiple ways of doing things
- 9. DEMO 1
- 10. ✪ SORTING IT OUT • Logging SQL doesn’t tie generated SQL to specific parts of the codebase
- 11. ✪ SORTING IT OUT • Existing profiler plugin can automatically log controller, service and view entry / exits • Not bad, but doesn’t tie SQL queries to those places • Stuff in e.g. taglibs isn’t made explicit • Stuff in layout vs main view isn’t made explicit
- 12. ✪ THE TARGET • MVC Mini Profiler • Developed for Stack Overflow • Keeps performance on your mind
- 13. ✪ THE TARGET
- 14. DEMO 2
- 15. ✪ CURRENT STATUS • Version 0.1 • Just pushed to Github • Plugin waiting for approval • Not all features of MVC Mini Profiler
- 16. ✪ FUTURE • Implement missing MVC Mini Profiler features – SQL Storage – Detect Duplicate SQL queries
- 17. ✪ FUTURE • Grails profiler plugin needs some work for 2.0+ • Not tested on 2.0+
- 18. ✪ FUTURE • Split out separate Java library to share functionality with other frameworks • Show nested GSP names • Show Tag Library calls • EXPLAIN functionality built in – Debug query performance from within app – Supported by PostgreSQL, MySQL, others? • Support non-SQL data stores
- 19. ✪ QUESTIONS https://github.com/tomdcc/grails-miniprofiler Tom Dunstan / @tomdcc [email protected] LICENSEDUNDERCREATIVECOMMONSBYENERGIZEDWORKLIMITED |HMSPRESIDENT,VICTORIAEMBANKMENT,LONDON,EC40HJ|WWW.ENERGIZEDWORK.COM 19