This process reads log files during rollback, restart recovery and roll forward.
此进程在回滚、重启恢复和前滚期间读取日志文件。
You need to roll forward your database by using this command (also in Listing 17).
您需要使用此命令前滚数据库（请参阅清单17）。
In the CLP, you will issue the following to do a restore and roll forward a table space.
在CLP中，可以发出以下命令来执行恢复，并前滚表空间。
In the CLP, you will issue the following commands to do a restore and roll forward a full database.
在CLP中，您将发出下面的命令来执行恢复，并前滚整个数据库。
Note, however, that you have the option to roll forward to a given local time (new feature) or GMT time.
但是注意，可以选择前滚到给定的本地时间(新特性)或GMT时间。
This option allows logging to be bypassed, but makes the table unrecoverable with a roll forward operation.
这个选项允许绕过日志记录机制，但是会使这个表无法通过前滚操作恢复。
Use the restore task assistant to restore the database and roll forward to a point in time before the delete statements were run.
使用恢复任务助手恢复数据库，并前滚到运行delete语句之前的时间点。
If the roll forward set has not been rolled forward far enough to be consistent with the database, the undo phase cannot occur.
如果前滚集前滚得不够远，无法与数据库一致，则不会出现撤消阶段。
Manually determining the correct point in time to which to roll forward a database is difficult, particularly for a partitioned database.
手动地确定前滚一个数据库的正确时间点比较困难，对于分区数据库更是如此。
To recover from the incremental backup, there are only two steps to follow, Restore the incremental database and roll forward to completion.
要恢复增量备份，只需要两步，恢复增量数据库并前滚。
For delta backup and restore, in the same scenario, you will restore each day's delta backup image (Monday through Saturday) and roll forward to complete the recovery.
对于相同场景中的delta备份和恢复，您将恢复每天的delta备份映像(星期一到星期六)，并执行前滚操作来完成恢复。
These failures are handled much the same way in DB2 UDB and Oracle, by restoring either offline or online backups and using roll forward operations to recover the logs.
在DB 2UDB和Oracle中，这些失败的处理方式大致是一样的，都是通过脱机或联机备份并使用前滚操作恢复日志来完成的。
Roll Forward Pending 0x80 a table space is in this state after a restore operation against a recoverable database.
Roll ForwardPending0x80在对可恢复的数据库执行恢复操作之后，表空间就处于这种状态。
If you are enabling an existing database for roll-forward recovery, change the number of primary logs to the sum of the number of primary and secondary logs you are currently using, plus 1.
如果您对现有数据库启用前滚恢复，将主日志的数量更改成当前正在使用的主日志和辅助日志的数量总和，再加1。
If logretain is set to "recovery" or userexit is set to "Yes" (see below), the active log files will be retained and become online archive log files for use in roll-forward recovery.
如果logretain设置成“Recovery”或者userexit设置成“Yes”(请参阅下一节)，将保留活动日志文件，而且这些文件将变成联机归档日志文件，以便在前滚恢复中使用。
You can change this configuration parameter during the roll-forward process to allow you to access logs in multiple locations.
在前滚过程中可以更改此配置参数以允许您访问多个位置中的日志。
Because you can change the log path location, the logs needed for roll-forward recovery may exist in different directories or on different devices.
因为您可以更改日志路径位置，所以前滚恢复所需的日志可能会在不同的目录中或在不同的设备上存在。
If both of these parameters are de-selected, roll-forward recovery becomes unavailable for the database because logs will no longer be retained.
如果取消选择这两个参数，就不能对数据库进行前滚恢复，因为将不再保留日志。
The above example shows that during roll-forward if point in time (PIT) specified in the command is old or early, you get error message (SQL1275N).
以上例子表明，在前滚期间，如果命令中指定的时间点(PIT)过早，那么会收到错误消息(SQL 1275n)。
The active log path is important when using either the userexit configuration parameter or the logretain configuration parameter to allow roll-forward recovery.
当使用userexit配置参数或logretain配置参数以允许前滚恢复时，活动日志路径非常重要。
Enabling it by setting it to "recovery" allows the database manager to use the roll-forward recovery method.
通过将它设置成“RECOVERY”来启用它，从而允许数据库管理器使用前滚恢复方法。
The results of performing a roll-forward recovery operation could differ slightly from replaying the logs on the standby database using HADR.
执行前滚恢复操作的结果与使用 HADR在备用数据库上重播日志的结果略有不同。
Archive logs that are currently stored in the database log path directory are not moved to the new location if the database is configured for roll-forward recovery.
如果将数据库配置成进行前滚恢复，那么就不会将当前存储在数据库日志路径目录中的归档日志移到新的位置。
Archive logs that are currently stored in the database log path directory are not moved to the new location if the database is configured for roll-forward recovery.
如果将数据库配置成进行前滚恢复，那么就不会将当前存储在数据库日志路径目录中的归档日志移到新的位置。
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