Need help on Awr Report

Question

It's hard to present AWR report content here as if i go for copy paste the content alinment and format get changed. Is there any better way to present AWR report in my query.
Here is my query.
In a 2 hour AWR reports for a database I can see the below top 5 wait event's
the database is running on high CPU consumption (there are very less physical reads on database and Logical read is high i suppose ) so I also gather the Segments by Logical Reads. Please provide any suggestion how can i avoid logical reads I/o for the dataabse. If you see at bottom only two segments are responsible for high logical reads.
Please let me know if more content of AWR report is required.
Per Second Per Transaction
Redo size: 12,765.52 2,030.27
Logical reads: 324,030.64 51,534.93
Block changes: 71.62 11.39
Physical reads: 28.26 4.49
Physical writes: 3.84 0.61
User calls: 333.61 53.06
Parses: 157.16 24.99
Hard parses: 0.17 0.03
Sorts: 30.07 4.78
Logons: 1.71 0.27
Executes: 156.35 24.87
Transactions: 6.29
% Blocks changed per Read: 0.02 Recursive Call %: 28.05
Rollback per transaction %: 16.17 Rows per Sort: 29.99
Top 5 Timed Events
Event          Waits          Time(s)     Avg Wait(ms)     % Total Call TimeWait Class
CPU time                    4,711               88.0
db file sequential read 190,548          356     2          6.7          User I/O
gc current block 2-way     172,948          151     1          2.8          Cluster
gc cr grant 2-way     128,668          67     1          1.2          Cluster
log file sync          37,920          54     1          1.0          Commit
Segments by Logical Reads
Total Logical Reads: 2,342,983,880
Captured Segments account for 99.8% of Total
Owner Tablespace Name Object Name Subobject Name Obj. Type Logical Reads %Total
web_dc DECOINDX D_1F01BC958000013B INDEX 909,141,504 38.80
web_dc DECODATA DM_RELATION_TYPE_S TABLE 908,104,384 38.76
web_dc DECOINDX D_1F01BC9580000518 INDEX 165,716,752 7.07
web_dc DECODATA DM_RELATION_S TABLE 136,235,504 5.81
web_dc DECOINDX D_1F01BC9580000024 INDEX 62,935,008 2.69
Regards
balvindar

Answer 1

In a 2 hour AWR reports for a database I can see the below top 5 wait event's
Comment: 2 hour is a too big interval to draw any conclusion. It should be 15-30 mins maximum.
Apart from that: 88 percent of the wall time is devoted to CPU, so do you have a problem? Not at all!!! Your database is doing pretty nothing.
the database is running on high CPU consumption (there are very less physical reads on database and Logical read is high i suppose ) so I also gather the Segments by Logical Reads. Please provide any suggestion how can i avoid logical reads I/o for the dataabse. If you see at bottom only two segments are responsible for high logical reads.
Comment: the database is not running on high CPU consumption. You would need to run an ADDM report to be able to ascertain that. We have no data on the CPU load of the server, nor how much Oracle is contributing to the load.
You cannot avoid logical read I/O, other than just stopping the application. You can tune them by tuning statements.
In the future, please wrap the output in   tags (no spaces, lowercase), or I will need new glasses ;)
Sybrand Bakker
Senior Oracle DBA