I dont remember where and by whom but i read an article long time back
that the LGWR --often-- needs to read an entire log block from disk
before it tries to write a partly modified log buffer block to the log
file.
Lets say the OS block size (Which is also the log file block size) is
512 bytes.
Then if LGWR tries to write redo shorter than that, it reads the
entire block and writes it back with the modified data.
I too am not entirely clear why. The article was written either by
Jonathan Lewis or Steve Adams or Tom Kyte.
regards
Srivenu
Received on Fri Nov 22 2002 - 02:54:13 CST
