Mysql table_open_cache

Increasing this value increases the number of file descriptors that mysqld requires. However, note that this is not a hard limit. You will be thrashing on that. K tables is a reasonable upper limit. It is not performing well.

Started looking a various things, came to open_tables caching and suspects something is very wrong here. It specifies the maximum number of. As I understand open_tables is the current value of opened tables and opened_tables is a counter and there is no any correlation between these two status variables. MySQL can keep open at one time.

The minimum value is 10. Just made adjustments to our system and going to wait another hours, and run the tuning programs again. With less than 0tables you should have absolutely no worry about that. Please provide more info. Still a strange symptom.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Also take into account that the MyISAM storage engine needs two file descriptors for each unique open table. A free Oracle Web (SSO) account (the one you use to login bugs. mysql.com) and a client that supports SFTP are required in order to access the SFTP server. To upload the file to sftp. Open an SFTP client and connect to sftp.

In addition, it is split into partitions by default (to reduce the contention). MariaDB cannot set this to exceed the hard limit imposed by the operating system. There are a few ways to do so. Save your changes to mysql. If one of the value is provided but others are left out, mysqld calculates others using a formula and in some cases, emits a warning if not possible.

On my db server, mysql has gigabytes for temporary tables and yet its creating of temporary tables on disk. According to mysqltuner, of temporary tables are created on disk. This is also documented at: mysqld Options (full list). Benchmarks have shown this.

GitHub is home to over million developers working together to host and review code, manage projects, and build software together. TABLE _NAME from information_schema. To set a database, the use command can be executed. So you should set it in my. For MEMORY tables, it is use to determine the memory block size.

So if two separate threads run queries requiring access to the same table at the same time then it will require two file descriptors. Another usefull parameter. Remove that line which you just added and Save.