Python User Group November 2013, SQL(alchemy) and transient detection
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This document discusses using SQL and non-SQL databases like MonetDB to analyze transient detection data from radio telescopes like LOFAR and AARTFAAC. It notes that AARTFAAC conducts 24/7 full sky monitoring to detect transients or "changes" like supernovae or pulsars. The large volume of image data requires moving calculations to the database. While initial monolithic SQL queries were difficult to work with, using an ORM like SQLAlchemy with a MonetDB dialect improved maintainability and portability of the code.
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Semelhante a Python User Group November 2013, SQL(alchemy) and transient detection (14)
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Python User Group November 2013, SQL(alchemy) and transient detection
- 1. Transient Detection and SQL Gijs Molenaar ! Anton Pannekoek Institute (UvA) ! @gijzelaerr gijs@pythonic.nl
- 2. LOFAR • Radio telescope • ~10–240 MHz • Software telescope • omni-directional
- 3. AARTFAAC • Lofar sub project • 24/7 full sky transient detection • ‘Changes’ • 99% Python code
- 5. Images • 10-240 MHz • Split in 10 bands • 1 image cube per second • future 10 images per second
- 7. Data rate • 500 - 5000 inserts per second • Higher in other modes
- 9. Quite a lot of data • move calculations to data (base)
- 10. nonosql • Structured data • Natural sharding by sky position • MonetDB
- 11. Why MonetDB • Dutch (CWI) • Fast with huge datasets • Developers next door
- 12. calculations to data • No moving around data • one huge big monolithic query per ‘operation’
- 13. Example
- 14. HORRIBLE • Huge monolithic queries • hard to read • hard to reason about • hard to test • hard to maintain • hard to port
- 16. NO! • DB revisions, versioning hell • For every code change new version • Schema migrations • Init functions on startup? • DB specific
- 17. SOLUTION
- 18. Why? • Object Relational Mapper • Better Query Builder Language! • Support multiple database dialect • Functions per dialect ! • SQLAlchemy -> SQL is like C -> assembler
- 19. example
- 20. Why not earlier? • Started by non programmers • No MonetDB dialect for SQLAlchemy
- 22. Questions?