Prepared Statements For more information, see Section 18.5.1.4, “Setting a Group’s Communication Protocol Version” . Downgrade the Group Replication communication protocol version of a group so that members at earlier releases can join, or upgrade the Group Replication communication protocol version of a group after upgrading MySQL Server on all members. The  GROUP_REPLICATION_ADMIN  privilege is required to use this function, and all existing group members must be online when you issue the statement, with no loss of majority. For MySQL InnoDB cluster, the communication protocol version is managed automatically whenever the cluster topology is changed using AdminAPI operations. You do not have to use these functions yourself for an InnoDB cluster. Syntax: Arguments: Return value: A string containing the result of the operation, for example whether it was successful or not. Example: For more information, see Section 18.5.1.4, “Setting a Group’s Communication Protocol Version” . MySQL 8.0 provides support for server-side prepared statements. This support takes advantage of the efficient client/server binary protocol. Using prepared statements with placeholders for parameter values has the following benefits: The following sections provide an overview of the characteristics of prepared statements: 2789 •Prepared Statements in Application Programs •Protection against SQL injection attacks. The parameter values can contain unescaped SQL quote and delimiter characters. •Less overhead for parsing the statement each time it is executed. Typically, database applications process large volumes of almost-identical statements, with only changes to literal or variable values in clauses such as  WHERE  for queries and deletes,  SET  for updates, and  VALUES  for inserts. 13.5 Prepared Statements SELECT group_replication_set_communication_protocol("5.7.25"); • version : For a downgrade, specify the MySQL Server version of the prospective group member that has the oldest installed server version. In this case, the command makes the group fall back to a communication protocol compatible with that server version if possible. The minimum server version that you can specify is MySQL 5.7.14. For an upgrade, specify the new MySQL Server version to which the existing group members have been upgraded. STRING group_replication_set_communication_protocol( version ) • group_replication_set_communication_protocol() +------------------------------------------------+ Note