Missing database indexes and unoptimized queries cause severe production slowdowns
8/10 HighCommon mistakes include missing database indexes on frequently queried columns, fetching entire tables instead of specific rows, and not using connection pooling. Queries that work fine in development with 100 rows can take 3+ seconds in production with 50,000 rows and no indexes instead of 30 milliseconds.
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Other common mistakes include missing database indexes on columns you frequently cury, fetching entire tables when you only need 10 rows, and not using connection pooling. So your app creates new database connection on every request. You might think your queries are fast because they work fine in development with 100 rows of test data, but in production with 50,000 rows and no indexes, that same query takes 3 seconds instead of 30 milliseconds.