Red Hat NETWORK 4.0 -, Справочное руководство

Страница: 260 / 290

244 Appendix C. Probes
Field Value
Oracle Port* 1521
ORACLE_HOME* /opt/oracle
Expected DB Name*
Timeout*
30
Table C-52. Oracle::Client Connectivity settings
C.9.6. Oracle::Data Dictionary Cache
The Oracle::Data Dictionary Cache probe computes the Data Dictionary Cache Hit Ra-
tio so as to optimize the SHARED_POOL_SIZE in
init.ora
. It collects the following
metrics:
•
Data Dictionary Hit Ratio — The ratio of cache hits to cache lookup attempts in the data
dictionary cache. In other words, the rate at which the database goes to the dictionary
instead of the hard disk to retrieve data. A low ratio suggests more RAM should be added
to the system.
•
Gets — The number of blocks accessed via single block gets (not through the consistent
get mechanism).
•
Cache Misses — The number of accesses made to the block buffer to retrieve data in a
consistent mode.
Field Value
Oracle SID*
Oracle Username*
Oracle Password*
Oracle Port*
1521
Timeout* 30
Warning Minimum Data Dictionary Hit Ratio
Critical Minimum Data Dictionary Hit Ratio
Table C-53. Oracle::Data Dictionary Cache settings