SQLite identify missing index

Question

Could you tell me please if it is possible to identify missing indexes for a select query using SQLite database?

Or is there any tool that can help?

Thank you!

Diva

Answer 1

Use EXPLAIN QUERY PLAN command to identify missing index for given SQL query. For example, the following result indicates you may need an index for a in table t1.

sqlite> EXPLAIN QUERY PLAN SELECT a, b FROM t1 WHERE a=1;
SCAN TABLE t1

If you have a lot of SQL queries and want to quickly identify missing index, I wrote a tool which helps analyze many SQL queries and saves you much time in the repeating process.

Riella

Answer 2

Using the sqlite3 command line tool, first enter

.expert

And then run your query as normal.

Runion

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