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Figure 7-3:
This figure shows two multiplexed online redo log configurations, one of which is labeled LEGAL, the other is labeled ILLEGAL. The LEGAL configuration shows DISK A and DISK B, containing three online redo log groups, each with 2 members. The ILLEGAL configuration shows DISK A and DISK B, but containing only one online redo log group with 2 members. This is illegal because there must be at least 2 online redo log groups.