由 macro 发布于: 2001-03-04 14:30

Unavailable Redo Log Members

The LGWR reacts differently certain online redo log members are unavailable.

1. If LGWR can access at lease one member in a group ,the writing to the accessible members of the group proceeds as usual;LGWR ignores the unavailable members fo the group.If the group was not active ---- that is ,the checkpoint was completed ---- the dropping and adding a new redo log member solves the problem .Otherwise,you have to first force a log switch.

2.If all members of the next group are inaccessible to LGWR at a log switch,the instance shuts down.If the group was not active,then dropping and adding a new redo log group solves the problem.If not, the database may need media recovery from the loss of an online redo log file.

3.If all members of the current group suddenly become inaccessible to LGWR as they are being written,the database instance shuts down.In this case,the database may need media recovery from the loss of an online redo log file.

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Macro Zeng

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