Question

I have a database table that has three columns: an ID, a timestamp, and a string. About 14,000 rows are inserted every day, so the table is very large. It currently has 1.3 million rows.

Table definition:

CREATE TABLE readings (
  id int primary key auto_increment,
  ts datetime not null, --the timestamp
  json text not null --the string
);

The query I’m running is:

SELECT * FROM readings WHERE ts >= 'TIME_START' AND ts <= 'TIME_END' ORDER BY ts

The query takes around 45 seconds to execute. How can I modify the table and/or query to make it faster?

Thanks.

Answer 1

Add a new index on ts to the table.