欢迎进入Oracle社区论坛,与200万技术人员互动交流 >>进入 5、开始重建控制文件 1)在类似的数据库(比如数据库名称"rman")上执行: alter database backup controlfile to trace; 然后在D:oracleadminrmanudump下找到最新的trace文件,以文本方式打开,找到
欢迎进入Oracle社区论坛,与200万技术人员互动交流 >>进入
5、开始重建控制文件
1)在类似的数据库(比如数据库名称"rman")上执行:
alter database backup controlfile to trace;
然后在D:oracleadminrmanudump下找到最新的trace文件,以文本方式打开,找到类似下面的一段话:
<p twffan="done"> <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ><span>STARTUP NOMOUNT <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>CREATE</span><span> CONTROLFILE REUSE </span><span>DATABASE</span><span> "rman" NORESETLOGS ARCHIVELOG <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>--</span><span> SET STANDBY TO MAXIMIZE PERFORMANCE</span><span> <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>MAXLOGFILES </span><span>50</span><span> <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" >MAXLOGMEMBERS </span><span>5</span><span> <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" >MAXDATAFILES </span><span>100</span><span> <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" >MAXINSTANCES </span><span>1</span><span> <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" >MAXLOGHISTORY </span><span>226</span><span> <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" >LOGFILE <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>GROUP</span><span> </span><span>1</span><span> </span><span>'</span><span>D:ORACLEORADATarmANREDO01.LOG</span><span>'</span><span> SIZE 100M, <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>GROUP</span><span> </span><span>2</span><span> </span><span>'</span><span>D:ORACLEORADATarmANREDO02.LOG</span><span>'</span><span> SIZE 100M, <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>GROUP</span><span> </span><span>3</span><span> </span><span>'</span><span>D:ORACLEORADATarmANREDO03.LOG</span><span>'</span><span> SIZE 100M <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>--</span><span> STANDBY LOGFILE</span><span> <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>DATAFILE <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>'</span><span>D:ORACLEORADATarmANSYSTEM01.DBF</span><span>'</span><span>, <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>'</span><span>D:ORACLEORADATarmANUNDOTBS01.DBF</span><span>'</span><span>, <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>'</span><span>D:ORACLEORADATarmANCWMLITE01.DBF</span><span>'</span><span>, <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>'</span><span>D:ORACLEORADATarmANDRSYS01.DBF</span><span>'</span><span>, <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>'</span><span>D:ORACLEORADATarmANEXAMPLE01.DBF</span><span>'</span><span>, <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>'</span><span>D:ORACLEORADATarmANINDX01.DBF</span><span>'</span><span>, <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>'</span><span>D:ORACLEORADATarmANODM01.DBF</span><span>'</span><span>, <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>'</span><span>D:ORACLEORADATarmANTOOLS01.DBF</span><span>'</span><span>, <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>'</span><span>D:ORACLEORADATarmANUSERS01.DBF</span><span>'</span><span>, <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>'</span><span>D:ORACLEORADATarmANXDB01.DBF</span><span>'</span><span>, <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>'</span><span>D:ORACLEORADATarmANTEST.ORA</span><span>'</span><span> <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>CHARACTER</span><span> </span><span>SET</span><span> WE8MSWIN1252</span></p>
2)将上面这段话修改为如下:
<p twffan="done"> <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ><span>STARTUP NOMOUNT <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>CREATE</span><span> CONTROLFILE </span><span>set</span><span> </span><span>DATABASE</span><span> "tti" RESETLOGS </span><span>--</span><span>注意这里要"set"</span><span> <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" >--</span><span> SET STANDBY TO MAXIMIZE PERFORMANCE</span><span> <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>MAXLOGFILES </span><span>50</span><span> <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" >MAXLOGMEMBERS </span><span>5</span><span> <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" >MAXDATAFILES </span><span>100</span><span> <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" >MAXINSTANCES </span><span>1</span><span> <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" >MAXLOGHISTORY </span><span>226</span><span> <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" >LOGFILE <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>GROUP</span><span> </span><span>1</span><span> </span><span>'</span><span>D:ORACLEORADATAttiREDO01.LOG</span><span>'</span><span> SIZE 100M, <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>GROUP</span><span> </span><span>2</span><span> </span><span>'</span><span>D:ORACLEORADATAttiREDO02.LOG</span><span>'</span><span> SIZE 100M, <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>GROUP</span><span> </span><span>3</span><span> </span><span>'</span><span>D:ORACLEORADATAttiREDO03.LOG</span><span>'</span><span> SIZE 100M <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>--</span><span> STANDBY LOGFILE</span><span> <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>DATAFILE <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>'</span><span>D:ORACLEORADATAttiSYSTEM01.DBF</span><span>'</span><span>, <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>'</span><span>D:ORACLEORADATAttiUNDOTBS01.DBF</span><span>'</span><span>, <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>'</span><span>D:ORACLEORADATAttiCWMLITE01.DBF</span><span>'</span><span>, <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>'</span><span>D:ORACLEORADATAttiDRSYS01.DBF</span><span>'</span><span>, <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>'</span><span>D:ORACLEORADATAttiEXAMPLE01.DBF</span><span>'</span><span>, <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>'</span><span>D:ORACLEORADATAttiINDX01.DBF</span><span>'</span><span>, <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>'</span><span>D:ORACLEORADATAttiODM01.DBF</span><span>'</span><span>, <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>'</span><span>D:ORACLEORADATAttiTOOLS01.DBF</span><span>'</span><span>, <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>'</span><span>D:ORACLEORADATAttiUSERS01.DBF</span><span>'</span><span>, <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>'</span><span>D:ORACLEORADATAttiXDB01.DBF</span><span>'</span><span>, <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>'</span><span>D:ORACLEORADATAttiTEST.ORA</span><span>'</span><span> <img src="/static/imghwm/default1.png" data-src="/inc/test.jsp?url=http%3A%2F%2Foracle.chinaitlab.com%2FUploadFiles_7269%2F200611%2F20061124104939678.gif&refer=http%3A%2F%2Foracle.chinaitlab.com%2Fbackup%2F531249_2.html" class="lazy" alt="如何恢复一个只有完好数据文件的数据库?" ></span><span>CHARACTER</span><span> </span><span>SET</span><span> WE8MSWIN1252</span></p>
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MySQLstringtypesimpactstorageandperformanceasfollows:1)CHARisfixed-length,alwaysusingthesamestoragespace,whichcanbefasterbutlessspace-efficient.2)VARCHARisvariable-length,morespace-efficientbutpotentiallyslower.3)TEXTisforlargetext,storedoutsiderows,

MySQLstringtypesincludeVARCHAR,TEXT,CHAR,ENUM,andSET.1)VARCHARisversatileforvariable-lengthstringsuptoaspecifiedlimit.2)TEXTisidealforlargetextstoragewithoutadefinedlength.3)CHARisfixed-length,suitableforconsistentdatalikecodes.4)ENUMenforcesdatainte

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)

ToaddusersinMySQLeffectivelyandsecurely,followthesesteps:1)UsetheCREATEUSERstatementtoaddanewuser,specifyingthehostandastrongpassword.2)GrantnecessaryprivilegesusingtheGRANTstatement,adheringtotheprincipleofleastprivilege.3)Implementsecuritymeasuresl

ToaddanewuserwithcomplexpermissionsinMySQL,followthesesteps:1)CreatetheuserwithCREATEUSER'newuser'@'localhost'IDENTIFIEDBY'password';.2)Grantreadaccesstoalltablesin'mydatabase'withGRANTSELECTONmydatabase.TO'newuser'@'localhost';.3)Grantwriteaccessto'

The string data types in MySQL include CHAR, VARCHAR, BINARY, VARBINARY, BLOB, and TEXT. The collations determine the comparison and sorting of strings. 1.CHAR is suitable for fixed-length strings, VARCHAR is suitable for variable-length strings. 2.BINARY and VARBINARY are used for binary data, and BLOB and TEXT are used for large object data. 3. Sorting rules such as utf8mb4_unicode_ci ignores upper and lower case and is suitable for user names; utf8mb4_bin is case sensitive and is suitable for fields that require precise comparison.

The best MySQLVARCHAR column length selection should be based on data analysis, consider future growth, evaluate performance impacts, and character set requirements. 1) Analyze the data to determine typical lengths; 2) Reserve future expansion space; 3) Pay attention to the impact of large lengths on performance; 4) Consider the impact of character sets on storage. Through these steps, the efficiency and scalability of the database can be optimized.


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