Server Status Variables The total number of times the source waited for an event with binary coordinates lower than events waited for previously. This can occur when the order in which transactions start waiting for a reply is different from the order in which their binary log events are written. This variable is available only if the source-side semisynchronous replication plugin is installed. The number of sessions currently waiting for replica replies. This variable is available only if the source-side semisynchronous replication plugin is installed. The number of commits that were acknowledged successfully by a replica. This variable is available only if the source-side semisynchronous replication plugin is installed. Whether semisynchronous replication currently is operational on the replica. This is  ON  if the plugin has been enabled and the replication I/O thread is running,  OFF  otherwise. This variable is available only if the replica-side semisynchronous replication plugin is installed. The value of this variable is the public key used by the  sha256_password  authentication plugin for RSA key pair-based password exchange. The value is nonempty only if the server successfully initializes the private and public keys in the files named by the  sha256_password_private_key_path  and sha256_password_public_key_path  system variables. The value of  Rsa_public_key  comes from the latter file. For information about  sha256_password , see Section 6.4.1.3, “SHA-256 Pluggable Authentication” . The number of queries offloaded to a secondary engine. This variable was added in MySQL 8.0.13. For use with HeatWave. See HeatWave User Guide. The number of joins that perform table scans because they do not use indexes. If this value is not 0, you should carefully check the indexes of your tables. The number of joins that used a range search on a reference table. The number of joins that used ranges on the first table. This is normally not a critical issue even if the value is quite large. • Rpl_semi_sync_master_wait_pos_backtraverse • Rpl_semi_sync_master_wait_sessions • Rpl_semi_sync_master_yes_tx • Rpl_semi_sync_slave_status • Rsa_public_key • Secondary_engine_execution_count • Select_full_join • Select_full_range_join • Select_range • Select_range_check 965