BLOG
← Back to Glossary
analyze
Analyze is an SQL statement used in various database systems, including DuckDB, to gather statistics about tables and columns.
Analyze is an SQL statement used in various database systems, including DuckDB, to gather statistics about tables and columns. These statistics help the query optimizer make better decisions when planning query execution. In DuckDB, the ANALYZE command updates statistics for a table or the entire database, which can lead to improved query performance.
For example, to analyze a specific table in DuckDB:
Copy code
ANALYZE mytable;
To analyze all tables in the current database:
Copy code
ANALYZE;
By running ANALYZE, you're helping the database understand the distribution of data within your tables, which can result in more efficient query plans and faster query execution times. This is particularly useful after large data modifications or when you notice unexpected performance issues with your queries.
Related terms
query →
A query is a request made to a database to retrieve, modify, or analyze data.
Execution plan →An execution plan is the tree of operators a database will run, in a specific order, to produce the result of a query — the concrete strategy chosen by the query planner and optimizer.
SQL query →A SQL query is a structured request written in Structured Query Language (SQL) that allows you to retrieve, analyze, or manipulate data stored in a database.
Cost-based optimizer →A cost-based optimizer chooses among logically equivalent query plans by estimating the execution cost of each one, using statistics about table sizes and data distributions, and picking the cheapest estimate.
CREATE TABLE statement →The CREATE TABLE statement is a fundamental SQL command that defines a new table in a database, specifying its structure including column names, data types,…
EXPLAIN clause →The EXPLAIN clause is a powerful diagnostic tool that shows how DuckDB plans to execute your SQL query.