Events of high expectation of the page

Hi gurus,

node 3 10.2.0.4 rac serving a packaged application.

Top 5 timed in awr shown as


Event time = CPU
Wait =
Time (s) = 1, 950
AVG Wait (ms)
Total call time = 45.3%
Wait for the class

Event = gc cr multi block request
Expected = 6 551 055
Time (s) = 1 396
Waiting for AVG (ms) = 0
Total call time = 38.9%
Wait the class = Cluster

Event = db file scattered read
Expected = 186 295
Time (s) = 719
Waiting for AVG (ms) = 4
Total call time % = 18.2
Wait for the class user/o =

Event = db file parallel read
Expected = 43 383
= 241 time (s)
Waiting for AVG (ms) = 6
Total call time % = 5.9
Wait for the class user/o =
Event = log file sync
Expected = 71 064
= 83 time (s)
Waiting for AVG (ms) = 1
Total call time = 3.1%
Wait for the class = Commit


DB_BLOCK_SIZE = 8KB
db_file_multiblock_read_count = default setting of 128

question:
are the high expected values of gc cr and read scattered file db multi block request are due to db_file_multiblock_read_count?
If this is the case, is there a way to find the optimal value for db_file_multiblock_read_count?
or any other findings please?

experts, appreciate your valuable help

Thanks in advance,
Charles

Tags: Database

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