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Asked: 2026-05-11T10:30:43+00:00

Table has about 8 million rows. There is a non-unique index for X. Showing

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Table has about 8 million rows. There is a non-unique index for X.

Showing indexes, it shows that in the table there is a non-unique index on key name X with ‘seq_in_index’ of 1, collation A, cardinality 7850780, sub_part NULL, packed NULL, index_type BTREE.

Still, this query can take 5 seconds to run. The list of ints comes from another system, and I am not allowed to store them in a table, because they represent friendships on a social network.

Is there a faster way than a massive IN statement?

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1 Answer

  1. You can convert your list of IDs into a temp-table (or table-var if MySql supports them) and join with it.

    The table would only live as long as the query so you’re not actually storing anything in a table.

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