How to query the usage rate of redo logfile

How to query the usage rate of redo logfile



The use of redo logfile cannot be queried through the v$ view, but we can get it through the underlying view.



First, I'll introduce you to the views and fields you refer to.

x$kccle----[K]ernel [C]ache [C]ontrolfile management [l]ogfil[e] Record

This view records the use of logfile

which

LESIZ------logfile size (in logical blocks) leseq------Log sequence # LEBSZ------logfile Logical block size

By the way, the redo logfile is in the operating system block. So, the Lebsz here is the size of the OS block.

If we need to get the OS block size, we can query from here:



Sql> select Max (Lebsz) lbsize from X$kccle;

Lbsize----------512





X$KCCCP----[K]ernel [C]ache [C]ontrolfile management [C]heckpoint]

Checkpoint Enhancement (progress)

CPODR_SEQ------Log file's SEQ # cpodr_bno------The number of blocks used in the log file

Get log File Usage:

SELECT Le.leseq current_log_sequence#,

100*cp.cpodr_bno/le.lesiz Percentage_full

From X$KCCCP cp,x$kccle le

WHERE Le.leseq =cp.cpodr_seq;

Reference:

Http://www.jlcomp.demon.co.uk/faq/redologuse.html







July 24, 2004, Saturday 0:13

If you are have any question,please mail to eygle@itpub.net.