we are using percona mysql 5.7 version.
MySQL not releasing the memory after operation complete.
we are very much grateful if anyone can guide us to resolve issue.
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MySQL doesn't "release memory" that is allocated statically, for example
innodb_buffer_pool_size. These allocations will consume more memory until they reach the configured limit and then stay there. The only way to "release it" is to reduce the size of those variables. You can reduce innodb_buffer_pool_size at runtime without restarting mysqld on 5.7.