The Spider storage engine was introduced in MariaDB 10.0.4
See Server Status Variables for a complete list of status variables that can be viewed with SHOW STATUS.
See also the Full list of MariaDB options, system and status variables.
Spider_direct_aggregate
numeric
MariaDB 10.0.4
Spider_direct_order_limit
numeric
MariaDB 10.0.4
Spider_mon_table_cache_version
numeric
MariaDB 10.0.4
Spider_mon_table_cache_version_req
numeric
MariaDB 10.0.4
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https://mariadb.com/kb/en/spider-server-status-variables/