Owner's Manual

3
Terminology Used in this Document
This document uses the terms logical unit number (LUN) and virtual disk .
These terms are synonymous and can be used interchangeably. The term
LUN is
commonly used in a Dell|EMC Fibre-Channel storage system environment and
virtual disk is commonly used in a Dell PowerVault™ SAS (Dell MD3000i and
Dell MD3000i with MD1000 expansion) storage environment.
Troubleshooting
The following section provides recommended actions for problems that you may
encounter while deploying and using your Enterprise Linux and Oracle software.
Performance and Stability
• PROBLEM : Enterprise Linux exhibiting poor performance and instability;
excessive use of swap space.
–
CAUSE : The Oracle System Global Area (SGA) exceeds the
recommended size.
–
RESOLUTION : Ensure that the SGA size does not exceed 65% of total
system RAM.
Enter
free at a command prompt to determine total RAM and reduce
the values of
db_cache_size and shared_pool_size parameters
in the Oracle parameter file accordingly.
•
PROBLEM : Unknown interface type warning appears in Oracle alert file;
poor system performance.
–
CAUSE : The public interface is configured as cluster communications
(private interface).
–
RESOLUTION : Force cluster communications to the private interface
by performing the following steps on one node:
a Log in as oracle .
b Enter sqlplus "/ as sysdba" at the command prompt.
The
SQL> prompt appears.