Key Variables Of SHOW STATUS for MySQL
The SHOW STATUS command in MySQL provides information about system status variables. These variables present a snapshot of the server’s operations and performance at any moment.
Due to the extensive number of status variables, discussing each one would be exhaustive. I’ll provide an overview of some key variables and their significance. You can always consult the official MySQL documentation for a comprehensive list.
| Variable Name | Description |
|---|---|
| Aborted_clients | The number of connections were aborted because the client died without properly closing the connection. |
| Aborted_connects | Number of failed connection attempts to the server. |
| Bytes_received | Number of bytes received from all clients. |
| Bytes_sent | Number of bytes sent to all clients. |
| Connections | Total number of connection attempts (successful or not) to the MySQL server since startup. |
| Created_tmp_disk_tables | Number of temporary tables on disk created automatically by the server during queries. |
| Created_tmp_files | Number of temporary files MySQL has created. |
| Created_tmp_tables | Number of in-memory temporary tables created automatically by the server during queries. |
| Delayed_insert_threads | Number of delayed insert handler threads in use. |
| Flush_commands | Number of executed FLUSH commands. |
| Handler_read_first | Number of times the first entry in an index was read. |
| Key_blocks_used | Number of used blocks from the key cache. |
| Max_used_connections | Maximum number of connections that have been in use simultaneously since the server started. |
| Open_files | Number of open files. |
| Open_tables | Number of connections were aborted because the client died without properly closing the connection. |
| Opened_tables | Number of tables that have been opened. |
| Queries | Number of statements executed by the server. |
| Threads_connected | Number of currently open connections. |
| Threads_created | The number of threads created to handle connections. |
| Uptime | How long (in seconds) has the server been up and running. |
This list is by no means exhaustive. Depending on the specific MySQL version and configuration, you might also encounter other variables. Monitoring and understanding these variables is crucial for diagnosing issues, optimizing performance, and ensuring the healthy operation of a MySQL server.