Oracle Database Discussions

Hello,
I am having hard time installing Oracle 11g R2 (11.2.0.1.0) on CentOs 6.3 64-bit. I've ran the following command to check and install all prerequisites.

#> yum install oracle-rdbms-server-11gR2-preinstall.x86_64

However when I run the installer:

#> ./runInstaller -silent -force \
FROM_LOCATION=/tmp/database/stage/products.xml \
oracle.install.option=INSTALL_DB_SWONLY \
UNIX_GROUP_NAME=oinstall \
ORACLE_HOME=/data01/app/oracle/product/11.2.0/db_1 \
ORACLE_HOME_NAME="db_1" \
ORACLE_BASE=/data01/app/oracle \
oracle.install.db.InstallEdition=SE \
oracle.install.db.isCustomInstall=false \
oracle.install.db.DBA_GROUP=dba \
oracle.install.db.OPER_GROUP=dba \
DECLINE_SECURITY_UPDATES=true

it fails at checking prerequisites and I see the following messages in the log:

---------------------------------------
INFO: Physical Memory: This is a prerequisite condition to test whether the system has at least 1GB (1048576.0KB) of total physical memory.
INFO: Severity:IGNORABLE
INFO: OverallStatus:VERIFICATION_FAILED
INFO: -----------------------------------------------
INFO: Verification Result for Node:dev01-cs-ord1
INFO: Expected Value:1GB (1048576.0KB)
INFO: Actual Value:992.41MB (1016228.0KB)
INFO: Error Message:PRVF-7530 : Sufficient physical memory is not available on node "dev01-cs-ord1" [Required physical memory = 1GB (1048576.0KB)]
INFO: Cause: Amount of physical memory (RAM) found does not meet minimum memory requirements.
INFO: Action: Add physical memory (RAM) to the node specified.
INFO: *********************************************
INFO: Package: libaio-0.3.105: This is a prerequisite condition to test whether the package "libaio-0.3.105" is available on the system.
INFO: Severity:IGNORABLE
INFO: OverallStatus:VERIFICATION_FAILED
INFO: -----------------------------------------------
INFO: Verification Result for Node:dev01-cs-ord1
INFO: Expected Value:libaio-0.3.105 (i386)
INFO: Actual Value:missing
INFO: Error Message:PRVF-7532 : Package "libaio-0.3.105 (i386)" is missing on node "dev01-cs-ord1"
INFO: Cause: A required package is either not installed or, if the package is a kernel module, is not loaded on the specified node.
INFO: Action: Ensure that the required package is installed and available.
INFO: *********************************************
INFO: Package: glibc-2.3.4-2.41: This is a prerequisite condition to test whether the package "glibc-2.3.4-2.41" is available on the system.
INFO: Severity:CRITICAL
INFO: OverallStatus:VERIFICATION_FAILED
INFO: -----------------------------------------------
INFO: Verification Result for Node:dev01-cs-ord1
INFO: Expected Value:glibc-2.3.4-2.41 (i686)
INFO: Actual Value:missing
INFO: Error Message:PRVF-7532 : Package "glibc-2.3.4-2.41 (i686)" is missing on node "dev01-cs-ord1"
INFO: Cause: A required package is either not installed or, if the package is a kernel module, is not loaded on the specified node.
INFO: Action: Ensure that the required package is installed and available.
INFO: *********************************************
INFO: Package: compat-libstdc++-33-3.2.3: This is a prerequisite condition to test whether the package "compat-libstdc++-33-3.2.3" is available on the system.
INFO: Severity:IGNORABLE
INFO: OverallStatus:VERIFICATION_FAILED
INFO: -----------------------------------------------
INFO: Verification Result for Node:dev01-cs-ord1
INFO: Expected Value:compat-libstdc++-33-3.2.3 (i386)
INFO: Actual Value:missing
INFO: Error Message:PRVF-7532 : Package "compat-libstdc++-33-3.2.3 (i386)" is missing on node "dev01-cs-ord1"
INFO: Cause: A required package is either not installed or, if the package is a kernel module, is not loaded on the specified node.
INFO: Action: Ensure that the required package is installed and available.
INFO: *********************************************
INFO: Package: libgcc-3.4.6: This is a prerequisite condition to test whether the package "libgcc-3.4.6" is available on the system.
INFO: Severity:IGNORABLE
INFO: OverallStatus:VERIFICATION_FAILED
INFO: -----------------------------------------------
INFO: Verification Result for Node:dev01-cs-ord1
INFO: Expected Value:libgcc-3.4.6 (i386)
INFO: Actual Value:missing
INFO: Error Message:PRVF-7532 : Package "libgcc-3.4.6 (i386)" is missing on node "dev01-cs-ord1"
INFO: Cause: A required package is either not installed or, if the package is a kernel module, is not loaded on the specified node.
INFO: Action: Ensure that the required package is installed and available.
INFO: *********************************************
INFO: Package: unixODBC-2.2.11: This is a prerequisite condition to test whether the package "unixODBC-2.2.11" is available on the system.
INFO: Severity:IGNORABLE
INFO: OverallStatus:VERIFICATION_FAILED
INFO: -----------------------------------------------
INFO: Verification Result for Node:dev01-cs-ord1
INFO: Expected Value:unixODBC-2.2.11 (i386)
INFO: Actual Value:missing
INFO: Error Message:PRVF-7532 : Package "unixODBC-2.2.11 (i386)" is missing on node "dev01-cs-ord1"
INFO: Cause: A required package is either not installed or, if the package is a kernel module, is not loaded on the specified node.
INFO: Action: Ensure that the required package is installed and available.
INFO: *********************************************
INFO: Package: pdksh-5.2.14: This is a prerequisite condition to test whether the package "pdksh-5.2.14" is available on the system.
INFO: Severity:IGNORABLE
INFO: OverallStatus:VERIFICATION_FAILED
INFO: -----------------------------------------------
INFO: Verification Result for Node:dev01-cs-ord1
INFO: Expected Value:pdksh-5.2.14
INFO: Actual Value:missing
INFO: Error Message:PRVF-7532 : Package "pdksh-5.2.14" is missing on node "dev01-cs-ord1"
INFO: Cause: A required package is either not installed or, if the package is a kernel module, is not loaded on the specified node.
INFO: Action: Ensure that the required package is installed and available.
--------------------------------------------

Interesting thing, that that most of these packages are already installed, but the version is newer than what installer is looking for.

My questions:

1. Do I really need to install the exact version of each package or is there a way to instruct the installer just use the latest?
2. Isn't "yum install oracle-rdbms-server-11gR2-preinstall.x86_64" supposed to install all required packages for me, so I don't deal with these kind of errors?
3. Can I ignore the errors with "Severity: Ignorable"?

Thank you very much for your help in advance.