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全部博文（487）
发布时间：2019-08-05 11:27:14
A)LGWR always writes to the redo logs each time a COMMIT occurs.C)LGWR never writes a single COMMIT to the redo logs.E)Multiple COMMITs can be written by LGWR in the same write request.Answer: DE冉：E 答案给的是 group commit 的概念，即在 lgwr 正在执行时，其他会话发生的 commit .........【阅读全文】
发布时间：2019-08-05 10:16:16
A)after undo is applied by PMON during process recoveryC)when the password file is updatedE)when flashback logs are updated赵：made to 发到......【阅读全文】
发布时间：2019-08-02 13:10:49
A)When DBWn writes dirty buffers.C)When a checkpoint occurs.E)When PMON restarts a serve process.赵：AB=>ADLGWR 进程将日志缓冲区的日志信息写入联机日志文件，触发的 5 个条件：1.用户发出 commit,rollback 语句。二、每隔 3 秒钟。(3 秒)四、日志信息数量达到 1MB。(1M).........【阅读全文】
发布时间：2019-08-02 11:35:57
A)AWR data can be retained for a month.C)Automatic AWR snapshots can be written once per hour.E)Automatic AWR snapshots can be written once every 6 hoursAnswer: ACEF......【阅读全文】
发布时间：2019-08-01 10:37:12
A)They are always created automatically.C)They are generated If statistics_level is set to basic.E)They are always retained forever.G)They are generated if statistics_level Is set to all.赵：......【阅读全文】
