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Maria Garcia

39 code snips and 0 followers in about 4 hours
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Database Specialist with 12+ years optimizing data systems. Expert in PostgreSQL, MySQL, query optimization, and database architecture. Deep knowledge of indexing strategies, replication, sharding, and performance tuning. Passionate about data integrity, scalability, and turning slow queries into millisecond responses.

Query debugging and troubleshooting techniques

Query debugging identifies performance and correctness issues. I use EXPLAIN ANALYZE to understand execution plans. Slow query logs reveal problematic queries. pgstatstatements tracks query statistics. Understanding sequential scans vs index scans hel
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Database best practices and optimization checklist

Database best practices ensure reliability and performance. I follow normalization principles—minimize redundancy. Use appropriate indexes—not too many, not too few. Implement constraints for data integrity. Choose correct data types for efficiency. R
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Query plan caching and prepared statements

Query plan caching improves performance by reusing execution plans. I use prepared statements to parse once, execute many times. PostgreSQL caches plans after 5 executions. Plan invalidation occurs when statistics change. Generic plans vs custom plans
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Database design patterns and anti-patterns

Database design patterns solve recurring problems. I use the Repository pattern to abstract data access. Active Record maps objects to tables. Unit of Work tracks changes for batch commits. Identity Map caches loaded entities. The Specification patter
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Advanced database locking and concurrency control

Database locks ensure data consistency in concurrent access. I understand lock types—row, table, advisory. Shared locks allow concurrent reads. Exclusive locks prevent all access. Understanding lock granularity prevents contention. Deadlocks occur whe
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Database testing strategies and fixtures

Database testing ensures schema and queries work correctly. I use transactions for test isolation—rollback after each test. Test fixtures provide consistent data. Factory patterns generate test data programmatically. Understanding schema migrations in
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