Performance Schema Miscellaneous Tables • THREAD_OS_ID The thread or task identifier as defined by the underlying operating system, if there is one: •When a MySQL thread is associated with the same operating system thread for its lifetime, THREAD_OS_ID  contains the operating system thread ID. •When a MySQL thread is not associated with the same operating system thread for its lifetime, THREAD_OS_ID  contains  NULL . This is typical for user sessions when the thread pool plugin is used (see Section 5.6.3, “MySQL Enterprise Thread Pool” ). For Windows,  THREAD_OS_ID  corresponds to the thread ID visible in Process Explorer (https:// technet.microsoft.com/en-us/sysinternals/bb896653.aspx). For Linux,  THREAD_OS_ID  corresponds to the value of the  gettid()  function. This value is exposed, for example, using the  perf  or  ps -L  commands, or in the  proc  file system ( /proc/ [pid] / task/ [tid] ). For more information, see the  perf-stat(1) ,  ps(1) , and  proc(5)  man pages. The resource group label. This value is  NULL  if resource groups are not supported on the current platform or server configuration (see Resource Group Restrictions). The  threads  table has these indexes: • RESOURCE_GROUP •Primary key on ( THREAD_ID ) •Index on ( NAME ) •Index on ( PROCESSLIST_ID ) •Index on ( PROCESSLIST_USER ,  PROCESSLIST_HOST ) •Index on ( PROCESSLIST_HOST ) •Index on ( THREAD_OS_ID ) •Index on ( RESOURCE_GROUP ) TRUNCATE TABLE  is not permitted for the  threads  table. 27.12.21.7 The tls_channel_status Table Connection interface TLS properties are set at server startup, and can be updated at runtime using the ALTER INSTANCE RELOAD TLS  statement. See Server-Side Runtime Configuration and Monitoring for Encrypted Connections. The  tls_channel_status  table (available as of MySQL 8.0.21) provides information about connection interface TLS properties: mysql>  SELECT * FROM performance_schema.tls_channel_status\G *************************** 1. row ***************************  CHANNEL: mysql_main PROPERTY: Enabled VALUE: Yes *************************** 2. row ***************************  CHANNEL: mysql_main PROPERTY: ssl_accept_renegotiates 5093