The EXPLAIN command will fail if you use it for other SQL commands, such as data definition language (DDL) or database operations. The EXPLAIN output relative unit costs are used by Amazon Redshift to choose a query plan. Amazon Redshift compares the sizes of various resource estimates to ...
Note:The EXPLAIN command cannot be used for the Database operations and DDL commands other than creating a table, insert, delete, select, select into and update. Examples of Redshift EXPLAIN Given below are the examples to see the implementation of the EXPLAIN command with SQL queries: Example...
There’s a handy trick to check if the index will be used if a planner is forced to do it. Execute those SQL commands in your database: SETenable_seqscanTOoff;SHOWenable_seqscan;/* off */ Make sure to change this setting for the same connection that your framework is using. For Ra...
Only in DbVisualizer Pro This feature is only available in the DbVisualizer Pro edition. You can analyze how a query is executed by the database, e.g. whether indexes are used or if the database has to do an expensive full scan. To analyze a query: ...