数据库启动的时候直接关闭,查看告警日志: Errors in file /opt/oracle/diag/rdbms/orcl11g/orcl11g/trace/orcl11g_mmon_3749.trc (incident=65276):ORA-00600: internal error code, arguments: [4194], [0x000000011], [0x7F9676793990], [], [], [], [],
数据库启动的时候直接关闭,查看告警日志:Errors in file /opt/oracle/diag/rdbms/orcl11g/orcl11g/trace/orcl11g_mmon_3749.trc (incident=65276): ORA-00600: internal error code, arguments: [4194], [0x000000011], [0x7F9676793990], [], [], [], [], [], [], [], [], [] Incident details in: /opt/oracle/diag/rdbms/orcl11g/orcl11g/incident/incdir_65276/orcl11g_mmon_3749_i65276.trc ORACLE Instance orcl11g (pid = 13) - Error 1578 encountered while recovering transaction (20, 27). Errors in file /opt/oracle/diag/rdbms/orcl11g/orcl11g/trace/orcl11g_smon_3745.trc: ORA-01578: ORACLE data block corrupted (file # 10, block # 2088) ORA-01110: data file 10: '/opt/oracle/oradata/orcl11g/undotb02.dbf' Completed: ALTER DATABASE OPEN Mon Nov 10 22:40:18 2014 Trace dumping is performing id=[cdmp_20141110224018] Mon Nov 10 22:40:20 2014 Starting background process SMCO Mon Nov 10 22:40:20 2014 SMCO started with pid=26, OS id=3805 Trace dumping is performing id=[cdmp_20141110224020] Exception [type: SIGSEGV, Address not mapped to object] [ADDR:0x79C8DBF3] [PC:0x2297740, kgegpa()+40] [flags: 0x0, count: 1] Exception [type: SIGSEGV, Address not mapped to object] [ADDR:0x79C8DBF3] [PC:0x229596B, kgebse()+279] [flags: 0x2, count: 2] Exception [type: SIGSEGV, Address not mapped to object] [ADDR:0x79C8DBF3] [PC:0x229596B, kgebse()+279] [flags: 0x2, count: 2] Mon Nov 10 22:40:21 2014 Doing block recovery for file 10 block 3395 Trace dumping is performing id=[cdmp_20141110224022] Mon Nov 10 22:40:23 2014 Simulated error on redo application. Mon Nov 10 22:40:24 2014 PMON (ospid: 3721): terminating the instance due to error 474 Instance terminated by PMON, pid = 3721
SYS@orcl11g>select file#,name from v$datafile; FILE# NAME ---------- ------------------------------------------------------------ 1 /opt/oracle/oradata/orcl11g/system01.dbf 2 /opt/oracle/oradata/orcl11g/sysaux01.dbf 3 /opt/oracle/oradata/orcl11g/undotbs01.dbf 4 /opt/oracle/oradata/orcl11g/users01.dbf 5 /opt/oracle/oradata/zbdba.dbf 7 /opt/oracle/oradata/orcl11g/test.dbf 8 /opt/oracle/oradata/orcl11g/test_size.dbf 9 /opt/oracle/oradata/orcl11g/test_size2.dbf 10 /opt/oracle/oradata/orcl11g/undotb02.dbf
在初始化参数中加入:
event='10061 trace name context forever, level 10'
_smon_internal_errlimit=1000000
再次启动数据库:
SYS@orcl11g>alter database open; alter database open * ERROR at line 1: ORA-00600: internal error code, arguments: [4194], [0x000000011], [0x000000000], [], [], [], [], [], [], [], [], [] SYS@orcl11g> SYS@orcl11g> SYS@orcl11g> SYS@orcl11g>select open_mode from v$database; OPEN_MODE ---------------------------------------- READ WRITE这时候我们重建undo表空间,问题解决

mySqlStringTypesimpactStorageAndPerformanCeaseAsfollows:1)长度,始终使用theSamestoragespace,whatcanbefasterbutlessspace-felfficity.2)varCharisvariable varcharisvariable length,morespace-morespace-morespace-effficitybuteftife buteftife butfority butfority textifforlyslower.3)

mySqlStringTypesIncludeVarChar,文本,char,enum和set.1)varCharisVersAtileForvariable-lengthStringStringSuptOptoPeptoPepecifientlimit.2)textisidealforlargetStortStorStoverStorextorewiteWithoutAdefinedLengthl.3)charlisfixed-Length

MySQLoffersvariousstringdatatypes:1)CHARforfixed-lengthstrings,2)VARCHARforvariable-lengthtext,3)BINARYandVARBINARYforbinarydata,4)BLOBandTEXTforlargedata,and5)ENUMandSETforcontrolledinput.Eachtypehasspecificusesandperformancecharacteristics,sochoose

TograntpermissionstonewMySQLusers,followthesesteps:1)AccessMySQLasauserwithsufficientprivileges,2)CreateanewuserwiththeCREATEUSERcommand,3)UsetheGRANTcommandtospecifypermissionslikeSELECT,INSERT,UPDATE,orALLPRIVILEGESonspecificdatabasesortables,and4)

toadduserInmysqleffectection andsecrely,theTheSepsps:1)USEtheCreateuserStattoDaneWuser,指定thehostandastrongpassword.2)GrantNectalRevileSaryPrivilegesSustate,usiveleanttatement,AdheringTotheTeprinciplelastPrevilegege.3)

toaddanewuserwithcomplexpermissionsinmysql,loldtheSesteps:1)创建eTheEserWithCreateuser'newuser'newuser'@''localhost'Indedify'pa ssword';。2)GrantreadAccesstoalltablesin'mydatabase'withGrantSelectOnMyDatabase.to'newuser'@'localhost';。3)GrantWriteAccessto'

MySQL中的字符串数据类型包括CHAR、VARCHAR、BINARY、VARBINARY、BLOB、TEXT,排序规则(Collations)决定了字符串的比较和排序方式。1.CHAR适合固定长度字符串,VARCHAR适合可变长度字符串。2.BINARY和VARBINARY用于二进制数据,BLOB和TEXT用于大对象数据。3.排序规则如utf8mb4_unicode_ci忽略大小写,适合用户名;utf8mb4_bin区分大小写,适合需要精确比较的字段。

最佳的MySQLVARCHAR列长度选择应基于数据分析、考虑未来增长、评估性能影响及字符集需求。1)分析数据以确定典型长度;2)预留未来扩展空间;3)注意大长度对性能的影响;4)考虑字符集对存储的影响。通过这些步骤,可以优化数据库的效率和扩展性。


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