Database & SQL

Database & SQL Tools

PostgreSQL index size calculators, query cost estimators, connection pool calculators, and SQL performance reference tools that run entirely in your browser.

🔒 Browser-only — no data sent ⚡ Zero account required 📦 10 free tools

postgresql

PostgreSQL Index Size Estimator→

Estimate PostgreSQL B-tree, GIN, and BRIN index sizes before creation.

postgresql

PostgreSQL Connection Pool Calculator→

Calculate optimal PgBouncer pool size from max_connections, app servers, and query throughput.

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SQL Query Cost Estimator→

Estimate PostgreSQL sequential vs index scan cost from table statistics.

postgresql

PostgreSQL VACUUM Threshold Calculator→

Calculate autovacuum trigger threshold and dead tuple accumulation for PostgreSQL tables.

replication

PostgreSQL Replication Lag Calculator→

Convert PostgreSQL replication lag bytes to seconds and estimate failover RPO.

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SQL Join Type Reference→

Reference guide to SQL join types including LATERAL, anti-join, and semi-join patterns.

postgresql

PostgreSQL Data Type Reference→

Reference guide to PostgreSQL data types — storage size, precision, and common pitfalls.

postgresql

PostgreSQL Partition Strategy Calculator→

Calculate optimal partition count and strategy from row count, retention, and write rate.

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Index Selectivity Estimator→

Estimate index selectivity and determine whether an index will benefit a query.

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Transaction Isolation Level Reference→

Reference guide to PostgreSQL transaction isolation levels, anomalies, and locking patterns.