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Home -> Community -> Usenet -> c.d.o.server -> DBA Tip of the Month
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March's Tip of the Month
Configuring Oracle8.1 with Multiple LGWR's
Using the DB_WRITER_PROCESSES initialization parameter, you can create multiple database writer processes (from DBW0 to DBW9). These may be useful for high-end systems such as NUMA machines and SMP systems that have a large number of CPUs.
These background processes are not the same as the I/O server processes (set with DBWR_IO_SLAVES); the latter can die without the instance failing. You cannot concurrently run I/O server processes and multiple DBWn processes on the same system.
If you have a large number of datafiles or are in a high OLTP environment, you should always have the CHECKPOINT_PROCESS initialization parameter set to TRUE. This setting enables the CKPT process, ensuring that during a checkpoint LGWR keeps on writing redo information, while the CKPT process updates the datafile headers.
Enjoy the Pipelines!
Cam White Received on Wed Mar 15 2000 - 00:00:00 CST
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