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Monitor Oracle library cache

There are three queries you can use to extract the details of library cache usage. The libdet.sql script will show you which object types are taking longer to find than others:

See Code depot for complete script


libdet.sql
select
namespace,
gets,
round(gethitratio*100,2) gethitratio,
from
sys.v$librarycache
order by
1;


Figure 5.7 – Extracting the library cache details

You can use bottleneck or wait-based analysis in addition to ratios and drill down queries to get an idea of overall library cache health.

 


The above is an excerpt from Oracle Performance Troubleshooting by Robin Schumacher.

It's only $19.95 and you can order it and get instant access to the Oracle scripts here:

http://www.rampant-books.com/book_2003_1_perf.htm

 

 

 

 
 
 

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