摘要： Miscellaneous FunctionsNameDescriptionDEFAULT()Return the default value for a table columnGET_LOCK()Get a named lockINET_ATON()Return the numeric value of an IP addressINET_NTOA()Return the IP address... 阅读全文

摘要： Server Status VariablesThe server maintains many status variables that provide information about its operation. You can view these variables and their values by using the SHOW [GLOBAL | SESSION] STATUS statement (see Section12.5.5.37, “SHOW STATUS Syntax”). The optional GLOBAL keyword aggregates the 阅读全文

摘要： Dynamic System VariablesMany server system variables are dynamic and can be set at runtime using SET GLOBAL or SET SESSION. You can also obtain their values using SELECT. See Section5.1.5, “Usin... 阅读全文

摘要： Session System VariablesSeveral system variables exist only as session variables. These cannot be set at server startup but can be assigned values at runtime using the SET statement (except for those ... 阅读全文

摘要： Server System VariablesThe MySQL server maintains many system variables that indicate how it is configured. Each system variable has a default value. System variables can be set at server startup usin... 阅读全文