v$filemetric_history

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v$filemetric_history

Oracle Tips by Burleson Consulting

The view v$filemetric_history reports such I/O metrics as averages for file read and write times and the number of physical reads and writes for both operations and blocks. This view allows the DBA to estimate datafile I/O activity that occurred during the last hour. For example, the file_reads_hr_ash.sql query retrieves the I/O metrics for a particular datafile:

file_reads_hr_ash.sql

SELECT

f.file_name,

to_char(h.begin_time,'hh24:mi:ss') "Begin",

to_char(h.end_time,'hh24:mi:ss') "End",

h.AVERAGE_READ_TIME,

h.PHYSICAL_READS

FROM

v$filemetric_history h,

dba_data_files f

WHERE

h.file_id = f.file_id

AND f.file_id = 3

ORDER BY

h.begin_time DESC

The output looks like the following:

FILE_NAME Begin End AVERAGE_READ_TIME PHYSICAL_READS

---------------------------------------- -------- -------- --- --------------

D:\ORACLE\SYSAUX01.DBF 15:46:30 15:56:33 0 6

D:\ORACLE\SYSAUX01.DBF 15:36:30 15:46:30 0 2

D:\ORACLE\SYSAUX01.DBF 15:26:32 15:36:30 0 16

D:\ORACLE\SYSAUX01.DBF 15:16:31 15:26:32 1 2156

D:\ORACLE\SYSAUX01.DBF 15:06:32 15:16:31 0 314

D:\ORACLE\SYSAUX01.DBF 14:56:32 15:06:32 1 821

D:\ORACLE\SYSAUX01.DBF 14:46:30 14:56:32 0 0

Now that some of the new v$ views have been introduced, the next section will present information on changes to existing SQL related v$ views.

SEE CODE DEPOT FOR FULL SCRIPTS

This is an excerpt from my latest book "Oracle Tuning: The Definitive Reference".

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts:

http://www.rampant-books.com/book_1002_oracle_tuning_definitive_reference_2nd_ed.htm

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