Database contention report

Question

hello i'm running on my database 10g r2 with autotuning a database contention report with the following result
CLASS TOTAL_WAITS TOTAL_TIME
free list 0 0
extent map 0 0
system undo block 0 0
sort block 0 0
segment header 1 0
bitmap index block 0 0
unused 0 0
system undo header 0 0
bitmap block 0 0
save undo block 0 0
data block 15535 4889
save undo header 0 0
1st level bmb 0 0
2nd level bmb 0 0
3rd level bmb 0 0
undo block 229 0
undo header 2498 174
file header block 1 0
what parameters should i focus to tune the database?
thanks in advance
nick

Answer 1

You need to put these figures into context - is the time spent on these waits significant compared to the snapshot interval and the rest of the time spent in the database.
Post an extract from a statspack report (or AWR report if you are licensed for it) showing the "Top 5 Timed Events", and the "Buffer Wait Statistics" from a busy period, and then we might be able to offer some sensible advice.
PS - before posting any of the report, check how to use the "code" tags (in curly brackets) to get the output into: fixed fontRegards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
"The temptation to form premature theories upon insufficient data is the bane of our profession."
Sherlock Holmes (Sir Arthur Conan Doyle) in "The Valley of Fear".