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https://dev.mysql.com/doc/refman/5.7/en/too-many-connections.html
If clients encounter Too many connections errors when attempting to connect to the mysqld server, all available connections are in use by other clients. The permitted number of connections is controlled by the max_connections system variable. The ...
https://dev.mysql.com/doc/refman/5.7/en/unix-signal-response.html
On Unix and Unix-like systems, a process can be the recipient of signals sent to it by the root system account or the system account that owns the process. Some command interpreters associate certain key sequences with signals, such as Control+C to ...
https://dev.mysql.com/doc/refman/5.7/en/validate-password.html
The validate_password plugin serves to improve security by requiring account passwords and enabling strength testing of potential passwords. This plugin exposes a set of system variables that enable you to configure password policy. The ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbd-definition.html
NodeGroup Version (or later) NDB 7.5.0 Type or units unsigned Default [...] Range 0 - 65536 Restart Type Initial System Restart: Requires a complete shutdown of the cluster, wiping and restoring the cluster file system from a backup, and then ...
https://dev.mysql.com/doc/refman/5.7/en/ldap-pluggable-authentication.html
Proxy user support: LDAP authentication can return to MySQL a user name different from the external user name passed by the client program, based on the LDAP groups the external user is a member of. For example, an LDAP user named joe can connect ...
https://dev.mysql.com/doc/refman/5.7/en/pluggable-authentication-system-variables.html
If authentication_ldap_sasl_group_search_attr has its default value of cn, searches return the cn value as the group name. For example, if an LDAP entry with a uid value of user1 has a cn attribute of mygroup, searches for user1 return mygroup as ...
https://dev.mysql.com/doc/refman/5.7/en/audit-log-restrictions.html
Consequently, MySQL Enterprise Audit and Group Replication cannot be used together. MySQL Enterprise Audit is subject to these general restrictions: Only SQL statements are logged. Changes made by no-SQL APIs, such as memcached, Node.JS, and the ...
https://dev.mysql.com/doc/refman/5.7/en/keywords.html
Most of the reserved words in the list are forbidden by standard SQL as column or table names (for example, GROUP). Certain keywords, such as SELECT, DELETE, or BIGINT, are reserved and require special treatment for use as identifiers such as table ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-socket-summary-tables.html
Each socket summary table has one or more grouping columns to indicate how the table aggregates events. This column can be grouped on to isolate, for example, client activity from that of the server listening sockets. These socket summary tables ...
https://dev.mysql.com/doc/refman/5.7/en/problems-with-null.html
When using DISTINCT, GROUP BY, or ORDER BY, all NULL values are regarded as equal. Aggregate (group) functions such as COUNT(), MIN(), and SUM() ignore NULL values. The concept of the NULL value is a common source of confusion for newcomers to SQL, ...