本文详细介绍了DBWn后台进程的各种触发条件，包括增量或正常检查点、脏缓冲区数量达到阈值、扫描过程中找不到空闲缓冲区、超时、RAC环境中的ping请求、表空间离线操作、表空间读取只读模式、删除或截断表等场景。此外还提及了对SYSTEM表空间数据文件的写入情况。
DBWn defers writing to the data files until one of the
following events occurs:
? Incremental or normal
checkpoint
? The number of dirty buffers reaches a threshold value
? A process scans a specified number of blocks when scanning for
free buffers and
cannot find any
? Timeout occurs
? A ping request in Real Application Clusters (RAC)
environment
? Placing a normal or temporary tablespace offline
? Placing a tablespace in read-only mode
? Dropping or truncating a table
<wbr>---- 会写system 表空间的数据文件<br> ? ALTER TABLESPACE tablespace name<wbr> BEGIN BACKUP</wbr></wbr>
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