1.INFO: 11rac2,11rac1 2.INFO: PRVF-5436 : The NTP daemon running on one or more nodes lacks the slewing option -x 3.INFO: Clock synchronization check using Network Time Protocol(NTP) failed 4.INFO: PRVF-9652 : Cluster Time Synchronization S
1.INFO: 11rac2,11rac1 2.INFO: PRVF-5436 : The NTP daemon running on one or more nodes lacks the slewing option "-x" 3.INFO: Clock synchronization check using Network Time Protocol(NTP) failed 4.INFO: PRVF-9652 : Cluster Time Synchronization Services check failed 原来是因为启动了NTP服务,并且没有加上-X这个参数。增加这个参数,不同的参数系统用不同方法,下面是LINUX的方法。到/etc/sysconfig/目录下
1.root@node01 sysconfig]# cat ntpd 2.# Drop root to id ‘ntp:ntp’ by default. Requires kernel >= 2.2.18. 3.OPTIONS="-x -u ntp:ntp -p /var/run/ntpd.pid" 重启一下ntp服务就可以了。
再到RAC安装界面上点重新检测。

Mastering the method of adding MySQL users is crucial for database administrators and developers because it ensures the security and access control of the database. 1) Create a new user using the CREATEUSER command, 2) Assign permissions through the GRANT command, 3) Use FLUSHPRIVILEGES to ensure permissions take effect, 4) Regularly audit and clean user accounts to maintain performance and security.

ChooseCHARforfixed-lengthdata,VARCHARforvariable-lengthdata,andTEXTforlargetextfields.1)CHARisefficientforconsistent-lengthdatalikecodes.2)VARCHARsuitsvariable-lengthdatalikenames,balancingflexibilityandperformance.3)TEXTisidealforlargetextslikeartic

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ToaddauserremotelytoMySQL,followthesesteps:1)ConnecttoMySQLasroot,2)Createanewuserwithremoteaccess,3)Grantnecessaryprivileges,and4)Flushprivileges.BecautiousofsecurityrisksbylimitingprivilegesandaccesstospecificIPs,ensuringstrongpasswords,andmonitori

TostorestringsefficientlyinMySQL,choosetherightdatatypebasedonyourneeds:1)UseCHARforfixed-lengthstringslikecountrycodes.2)UseVARCHARforvariable-lengthstringslikenames.3)UseTEXTforlong-formtextcontent.4)UseBLOBforbinarydatalikeimages.Considerstorageov

When selecting MySQL's BLOB and TEXT data types, BLOB is suitable for storing binary data, and TEXT is suitable for storing text data. 1) BLOB is suitable for binary data such as pictures and audio, 2) TEXT is suitable for text data such as articles and comments. When choosing, data properties and performance optimization must be considered.

No,youshouldnotusetherootuserinMySQLforyourproduct.Instead,createspecificuserswithlimitedprivilegestoenhancesecurityandperformance:1)Createanewuserwithastrongpassword,2)Grantonlynecessarypermissionstothisuser,3)Regularlyreviewandupdateuserpermissions

MySQLstringdatatypesshouldbechosenbasedondatacharacteristicsandusecases:1)UseCHARforfixed-lengthstringslikecountrycodes.2)UseVARCHARforvariable-lengthstringslikenames.3)UseBINARYorVARBINARYforbinarydatalikecryptographickeys.4)UseBLOBorTEXTforlargeuns


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