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Asked: 2026-05-23T17:45:42+00:00

I have two tables in my database: page and link. In each one I

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I have two tables in my database: page and link. In each one I define that the URL field is UNIQUE because I don’t want repetead URLs.

Being a UNIQUE field, it automatically have an index? Creating an index for these field can speed up the insertions? What is the most appropriate index for a VARCHAR field?

Having a lot of rows can slow the insert because this UNIQUE field? At the moment, I have 1,200,000 rows.

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  1. Editorial Team

    Yes, adding a UNIQUE constraint will create an index:

    Adding a unique constraint will automatically create a unique btree index on the column or group of columns used in the constraint.

    This won’t speed up your INSERTs though, it will actually slow them down:

    1. Every insert will have to be checked (using the index) to ensure that uniqueness is maintained.
    2. Inserts will also update the index and this doesn’t come for free.
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