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The maximum compression level that the server permits for the zstd algorithm on X Protocol connections. The range is the same as for the default compression level for this algorithm. If the client requests a higher compression level than this, the server uses the level you set here. If you do not specify this system variable, the server sets a maximum compression level of 11. 

## 20.5.6.3 X Plugin Status Variables 

The X Plugin status variables have the following meanings. 

• Mysqlx_aborted_clients 

The number of clients that were disconnected because of an input or output error. 

• Mysqlx_address 

The network address or addresses for which X Plugin accepts TCP/IP connections. If multiple addresses were specified using the mysqlx_bind_address  system variable, Mysqlx_address  displays only those addresses for which the bind succeeded. If the bind has failed for every network address specified by mysqlx_bind_address , or if the skip_networking  option has been used, the value of Mysqlx_address  is UNDEFINED . If X Plugin startup is not yet complete, the value of Mysqlx_address  is empty. 

• Mysqlx_bytes_received 

The total number of bytes received through the network. If compression is used for the connection, this figure comprises compressed message payloads measured before decompression ( Mysqlx_bytes_received_compressed_payload ), any items in compressed messages that were not compressed such as X Protocol headers, and any uncompressed messages. 

• Mysqlx_bytes_received_compressed_payload 

The number of bytes received as compressed message payloads, measured before decompression. 

• Mysqlx_bytes_received_uncompressed_frame 

The number of bytes received as compressed message payloads, measured after decompression. 

• Mysqlx_bytes_sent 

The total number of bytes sent through the network. If compression is used for the connection, this figure comprises compressed message payloads measured after compression ( Mysqlx_bytes_sent_compressed_payload ), any items in compressed messages that were not compressed such as X Protocol headers, and any uncompressed messages. 

