Very slowly found Oracle 10g2 database, why?

Hello.
I have a server with Intel(R) Xeon(R) CPU E5420 @ 2.50GHz and 8GB RAM. My Oracle version is 10.2.0.1.0.
I done reinstall my linux OS and Oracle database and i have big problem with found my database.
My DB found very slowly... searching etc... i have Automatic Shared Memory Management Enabled and i gave:
SQL> show sga;
Total System Global Area 6442450944 bytes
Fixed Size 2030408 bytes
Variable Size 2768241848 bytes
Database Buffers 3657433088 bytes
Redo Buffers 14745600 bytes
total used free shared buffers cached
Mem: 8202164 4466812 3735352 0 20308 4120460
-/+ buffers/cache: 326044 7876120
Swap: 7811064 0 7811064
I see very small memory is used from Oracle....
Why my base found very very slowly? I must wait 60 seconds from time to time ... will be reaction.
Please help me.

Hi
Well, I wouldn't worry about memory related issues as buffer hit rates are fine.
Are you loading a lot of data? A fair amount of data is being sent to the DB (4GB in one hour), but this is not the main issue:
bytes received via SQL*Net from client     4,249,180,400     1,184,581.85     799,168.78
The main issue seems I/O related. it looks like you are doing a lot of updates and the main waits are for I/O writing to the log files:
Top 5 Timed Events
Event     Waits     Time(s)     Avg Wait(ms)     % Total Call Time     Wait Class
log file parallel write     19,207     1,800     94     59.6     System I/O
control file parallel write     3,567     1,172     328     38.8     System I/O
log file sync     8,567     823     96     27.2     Commit
log file switch (checkpoint incomplete)     422     281     666     9.3     Configuration
SQL*Net more data from client     2,080,301     174     0     5.8     Network
In fact, your disks seems quite slow. AVG of 94 ms to write to log files?
Besides faster disks, see if your log files are switching excessively. If so, increase the size and add more members...
Sorry, have a meeting so can't look more now :-)
Cheers,
A.

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