With asynchronous log writing, the event generating the audit record does not have to wait until the record is written to disk before returning its status.
在异步写日志的情况下，生成审计记录的事件无需等到审计记录被写到磁盘便可返回它的状态。
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This is not a replacement for the system event logs (wps_*.log); instead, it lets you record errors from a business perspective, such as the number of failing portlets within a certain timeframe.