Memory exhausted error | WordPress.org

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I’m getting memory exhausted errors in my test and production site . When checking php-slow query log I could see lots of errors like below:

script_filename = /index.php
[0x00007f8fcba182e0] mysqli_query() /wp-includes/wp-db.php:2169
[0x00007f8fcba18270] _do_query() /wp-includes/wp-db.php:2058
[0x00007f8fcba18190] query() /wp-content/plugins/query-monitor/classes/QM_DB.php:54
[0x00007f8fcba180d0] query() /wp-includes/wp-db.php:2798
[0x00007f8fcba18010] get_col() /wp-includes/class-wp-query.php:3129
[0x00007f8fcba17860] get_posts() /wp-includes/class-wp-query.php:3586
[0x00007f8fcba177f0] query() /wp-includes/class-wp-query.php:3718

Strange thing is I already deactivated Query monitor plugin few months ago, but errors pointing to QM_DB.php in in query monitor plugin…
like above i could see lots of errors with different files names, but in all query-monitor/QM_DB is common.

Any idea why this happening even we uninstalled the plugin ?

 

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