Server System Variables This variable is deprecated and you should expect it to be removed in a future MySQL release. The query cache was removed in MySQL 8.0.3.  have_query_cache  is deprecated, always has a value of  NO , and you should expect it to be removed in a future MySQL release. YES  if  RTREE  indexes are available,  NO  if not. (These are used for spatial indexes in  MyISAM  tables.) YES  if  mysqld  supports SSL connections,  DISABLED  if the server was compiled with SSL support, but was not started with the appropriate connection-encryption options. For more information, see Section 2.9.6, “Configuring SSL Library Support” . As of MySQL 8.0.26,  have_ssl  is deprecated and subject to removal in a future MySQL version. For information about TLS properties of MySQL connection interfaces, use the  tls_channel_status table. Whether the statement execution timeout feature is available (see Statement Execution Time Optimizer Hints). The value can be  NO  if the background thread used by this feature could not be initialized. System Variable have_statement_timeout Scope Global Dynamic No SET_VAR  Hint Applies No Type Boolean Deprecated 8.0.26 System Variable have_ssl Scope Global Dynamic No SET_VAR  Hint Applies No Type String Valid Values YES  (SSL support available) DISABLED  (SSL support was compiled into server, but server was not started with necessary options to enable it) 805 • have_statement_timeout • have_ssl • have_rtree_keys • have_query_cache