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This variable is deprecated and you should expect it to be removed in a future MySQL release. 

## • have_query_cache 

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. 

## • have_rtree_keys 

YES  if RTREE  indexes are available, NO  if not. (These are used for spatial indexes in MyISAM  tables.) 

## • have_ssl 

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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. 

## • have_statement_timeout 

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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. 

