I know that you can tell if an index exists in MySQL with a statement like
SHOW INDEX FROM table1;
but is it possible to actually query the index to check the state of the index, eg something along the lines of
SELECT * FROM <index_name>
And get a result set like you would from a table?
No, you cannot query an index in MySQL or MariaDB.
You can see statistics of an index - https://dev.mysql.com/doc/refman/5.6/en/statistics-table.html , but you cannot peek into the index.
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