db index django

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27 Apr 2017

1This is not really django specific; more to do with databases. You add indexes on columns when you want to speed up searches on that column.
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3Typically, only the primary key is indexed by the database. This means look ups using the primary key are optimized.
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5If you do a lot of lookups on a secondary column, consider adding an index to that column to speed things up.
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7Keep in mind, like most problems of scale, these only apply if you have a statistically large number of rows (10,000 is not large).
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9Additionally, every time you do an insert, indexes need to be updated. So be careful on which column you add indexes.
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11As always, you can only optimize what you can measure - so use the EXPLAIN statement and your database logs (especially any slow query logs) to find out where indexes can be useful.

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