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Oracle RAC performance in STATSPACK & AWR reports

Oracle Database Tips by Donald Burleson

This excellent presentation  on RAC testing by Plamen Zyumbyulev shows how to interpret Oracle Real application clusters (RAC performance via STATSPACK and AWR reports:

BAD PERFORMANCE
 
Top 5 Timed Events
~~~~~~~~~~~~~~~~~~                                                % Total
Event                                          Waits    Time (s) Ela Time
--------------------------------------- ------------ ----------- --------
global cache cr request                       34,568         958    31.44
buffer busy global CR                          6,513         620    20.35
db file sequential read                       64,214         455    14.92
latch free                                    13,542         453    14.88
buffer busy waits                             10,971         295     9.69
 
GOOD PERFORMANCE
 
Top 5 Timed Events
~~~~~~~~~~~~~~~~~~                                                % Total
Event                                          Waits    Time (s) Ela Time
--------------------------------------- ------------ ----------- --------
latch free                                    10,969         666    51.28
buffer busy waits                             15,379         159    12.23
CPU time                                                     149    11.47
PL/SQL lock timer                                 51         105     8.05
db file sequential read                       25,163          96     7.36
 
Global Cache Service - Workload Characteristics       BAD   GOOD
-----------------------------------------------
Ave global cache get time (ms):                         11.8   2.2
Ave global cache convert time (ms):                     51.7  11.2
Ave build time for CR block (ms):                        0.7   0.0
Ave flush time for CR block (ms):                        0.2   0.2
Ave send time for CR block (ms):                         0.0   0.2
Ave time to process CR block request (ms):               0.9   0.4
Ave receive time for CR block (ms):                      1.6   0.4
Ave pin time for current block (ms):                     0.2   0.2
Ave flush time for current block (ms):                   0.0   0.0
Ave send time for current block (ms):                    0.1   0.1
Ave time to process current block request (ms):          0.3   0.3
Ave receive time for current block (ms):                33.4   7.5
Global cache hit ratio:                                  9.5   3.9
Ratio of current block defers:                           0.0   0.0
% of messages sent for buffer gets:                      6.7   2.5
% of remote buffer gets:                                 1.8   0.7
Ratio of I/O for coherence:                              1.2   1.3
Ratio of local vs remote work:                           4.3   4.4
Ratio of fusion vs physical writes:                      0.0   0.0
 
Global Enqueue Service Statistics        BAD   GOOD
---------------------------------
Ave global lock get time (ms):                           0.2   0.0
Ave global lock convert time (ms):                       0.0   0.0
Ratio of global lock gets vs global lock releases:       1.2   1.1
 
GCS and GES Messaging statistics
--------------------------------
Ave message sent queue time (ms):                       16.5   1.7
Ave message sent queue time on ksxp (ms):               29.4   2.5
Ave message received queue time (ms):                    1.9   0.3
Ave GCS message process time (ms):                       0.1   0.1
Ave GES message process time (ms):                       0.1   0.0
% of direct sent messages:                              49.7  63.4
% of indirect sent messages:                            50.3  36.6
% of flow controlled messages:                           0.0   0.0
 

For complete treatment of Oracle RAC tuning, see Mike Ault's book Oracle 10g Grid & Real Application Clusters


 

 

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