更新 '数据库/oracle/归档日志处理.md'
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## 关闭归档
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```sql
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archive log list; #查看是否是归档方式
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alter system set log_archive_start=false scope=spfile; #禁用自动归档
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shutdown immediate;
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startup mount; #打开控制文件,不打开数据文件
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alter database noarchivelog; #将数据库切换为非归档模式
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alter database open; #将数据文件打开
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archive log list; #查看此时便处于非归档模式
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```
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## 开启归档
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```sql
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# 关闭oracle
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shutdown immediate;
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# 启动为mount状态
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startup mount
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# 更改为归档模式
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alter database archivelog
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# 更改数据库为‘打开’状态
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alter database open
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```
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## 查看归档日志使用情况
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## 查看归档日志使用情况
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```sql
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```sql
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sqlplus / as sysdba
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sqlplus / as sysdba
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