Explain Plan

Database Performance: Tuning Queries and Indexes Database speed comes from two allies working together: well-written queries and smart indexes. Rewriting a slow query can shave time, but the gains multiply when you pair it with the right indexes. If either side is weak, the other will only carry you so far. Start with the basics Begin by locating slow queries with logs and a simple monitor. Use an explain plan to see how the database would run a query. Look for full table scans, large sorts, or repeated work across calls. Focus on queries that are common, or return a lot of data. Small changes here can compound into big improvements. ...

SQL Query Optimization for Performance Performance starts with understanding the data and the workload. Start by collecting representative questions your app runs most often. With this insight, you can balance storage, indexing, and SQL writing. Small, deliberate changes often add up to big gains. Focus on indexes first. Create indexes on columns used in WHERE and JOIN clauses, especially when the column is selective. A covering index (one that has all the columns needed by the query) can avoid extra lookups. Be careful not to over-index; too many indexes slow writes and take space. For example, CREATE INDEX idx_orders_date_status ON orders (order_date, status) helps date-range and status filters. ...