Authentication Plugins Maximum Value ( ≤  8.0.17) 5 For simple LDAP authentication, the logging level for messages written to the error log. The following table shows the permitted level values and their meanings. Table 6.25 Log Levels for authentication_ldap_simple_log_status Option Value Types of Messages Logged 1 No messages 2 Error messages 3 Error and warning messages 4 Error, warning, and information messages 5 Same as previous level plus debugging messages from MySQL 6 Same as previous level plus debugging messages from LDAP library Log level 6 is available as of MySQL 8.0.18. • authentication_ldap_simple_max_pool_size Command-Line Format --authentication-ldap-simple-max- pool-size=# System Variable authentication_ldap_simple_max_pool_size Scope Global Dynamic Yes SET_VAR  Hint Applies No Type Integer Default Value 1000 Minimum Value 0 Maximum Value 32767 For simple LDAP authentication, the maximum size of the pool of connections to the LDAP server. To disable connection pooling, set this variable to 0. This variable is used in conjunction with  authentication_ldap_simple_init_pool_size . See the description of that variable. • authentication_ldap_simple_referral Command-Line Format --authentication-ldap-simple- referral[={OFF|ON}] Introduced 8.0.20 System Variable authentication_ldap_simple_referral Scope Global Dynamic Yes 1375