Websphere Interview Questions

When you develop an application or start an installed application.

Shared libraries are files used by multiple applications. Each shared library consists of a symbolic name, a Java class path, and a native path for loading Java Native Interface (JNI) libraries. You can use shared libraries to reduce the number of duplicate library files on your system

A generic server is a server that is managed in the WebSphere administrative domain, although it is not a server that is supplied by WebSphere Application Server. The WebSphere Application Server gene...

SSL uses both symmetric and asymmetric encryption algorithms. Symmetric algorithms use the same key to encrypt and decrypt data. They are faster than asymmetric algorithms but can be insecure. Asymmet...

WebSphere Application Server Troubleshooting Tools Use these tools to help you troubleshoot problems that are specific to WebSphere Application Server. For example, you can use these tools to analyze ...

to generate a heap dump we need to login to dmgr level bin directory and run the below

Code
./wsadmin.sh<----after that wsadmin prompt will come
 
wsadmin>set jvm[$AdminControl CompleteObjectNames 
 
type=jvm,process=server1,*]<---server1 will be that server for which you are taking dumps
 
wsadmin>$AdminControl.invoke $jvm generateheapdumps
 
 
Default location:temp

Get the pid of the JVM (either from logs directory) or do a ps-ef |grep
then by using the pid
kill -3
Heap dumps location generally in the logs folder.
or you can change the location by getting into the admin console.

For WASV7.0(JDK1.6),the ojdbc6.jar is used.The DB is 10G,11G.

ojdbc14.jar

For DB2-50000
For Oracle-1521(for TNS)
All the default ports for the Oracle ,see the below URL:---
http://docs.oracle.com/html/B10262_01/ports.htm

/etc/hosts

ihs default port 80,
ihs default secure is 443,
ihs admin default port 8008

Default port No For is IHS(IBM HTTP Servers)is 80 and 8080.

Default heap size Memory :256 MB
for Max Heap Size= ((Total_RAM/2)/No of Servers).
For Example Ram size =4 GB , No of servers=3
max Heap size =4GB /2/3 =666.3 MB

Collector tools gather the Information of Application Server installation and logs and configuration Files in Single Jar file . and it will send to IBM Customer Support to determining and analyzing your problem.

ihs log files:error.log and access.log

application server log

files:systemout.log,systemerr.log,nativestderror.log,nativestdout.log,trace.log

plugin log file:http-plugin.log

at node level activity.log

ffdc.log

We have different types of logs in WAS

JVM logs: SystemOut.log , SystemErr.log

process or Native logs : native_stdout.log, native_stderr.log

IBM service log : activity.log

Diagnostic log : trace.log

serverStatus.bat server1

=> apachectl status
=> ps -eaf | grep httpd

heap size depends on following parameters
number of connection to the server
its ram size and

for 32 bit operating system it is 2 gb
for 64 bit operating system it is 4 gb

if Max heap = min heap then it takes a time for garbage collection .

Go to the installation directory of the Web server.
Find the subdirectory that contains the executable,

execute the command

windows : apache.exe -V

Linux : ./httpd -v

aix/solaris : ./apachectl -v

oracle-1521
db2-50000

Three types of log levels is there 1.Hops : When this setting is selected, you see the data at the application server level, not the level of individual components such as enterprise beans or servle...

IHS is the web server which receives the request before reaching the request to app server.

Embedded IHS is the embedded web server which decrease the burden on application server and it is not recommended for production environment.

Manged node is nothing but, the node is federated with Deployment Manage profile in Network Deployment then there may generate nodeagent for communication of Dmgr and node. So The node which have nodeagent that is Managed Node..

--Santha

After federating nodes to deployment manager. Nodes becomes managed nodes. Deployment manager profile maintains the configuration of entire cell