Oracle Weblogic Server Troubleshooting -Different ways to take Heap Dump & Analysis

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Пікірлер: 53

@user-mc4hp7yy9r 6 ай бұрын

in which file weblogic version and which kind of edition like details will be stored?

@user-mc4hp7yy9r 7 ай бұрын

if we observe slowness in application first and foremost what should we do ? 1)first do we need to check logs of the managed server ? or 2)Do we need to check heap usage in console ? or 3) if we found OOM error in logs then only do we need to observe heap usage ? please explain sir

@swamy264 3 ай бұрын

Taking the class name sharing with developer and all very lengthy process instead of that what can we do to bring up server ? Can we trouble shoot it from anather way for immediately ?

@digitak.middleware 3 ай бұрын

The immediate solution to recover is restart. The other way is you need good developer skills to troubleshoot by own

@user-mc4hp7yy9r 8 ай бұрын

can we specify arguments for thread dump as well in the console ? to get thread dump file automatically ?

@digitak.middleware 8 ай бұрын

You have to write your custom script

@user-mc4hp7yy9r 6 ай бұрын

weblogic is running in the linux vm and it is working for couple of years and started getting an error stating that no free space in the disk but when i enter in to the vm there is more free space in the disk as per the disk but i am getting application is throwing the error no free space in the disk what might be the reason how we can resolve ?

@digitak.middleware 6 ай бұрын

Check free space of the filesystem where you have current log files

@surendraKumar-ib9yb Жыл бұрын

sir can you please tell us how to read/analyze that. hprof file which we created using jmap or jcmd tools

@digitak.middleware Жыл бұрын

You can use any tool like MAT, jvisual as I have explained

@user-mc4hp7yy9r 6 ай бұрын

so in which scenario we have increase the values of XMS and XMX ?

@digitak.middleware 6 ай бұрын

If you memory utilization is continuously high and gc not freeing much memory after each full run

@user-mc4hp7yy9r 7 ай бұрын

if user complains slowness about application our server might be hung right ? then how can we check heap usage of our MS from console?

@digitak.middleware 6 ай бұрын

Not possible if console is not responding

@user-mc4hp7yy9r 6 ай бұрын

if application is running slow console also run slow ? is there relation between them ?@@digitak.middleware

@user-mc4hp7yy9r 7 ай бұрын

if managed server is in warning state also can we take heap dump by using jmap ?

@digitak.middleware 7 ай бұрын

Yes

@user-mc4hp7yy9r 7 ай бұрын

how can we check that jvm heap utilization ?

@digitak.middleware 7 ай бұрын

Multiple ways, one simple way is from admin console click on server name then monitoring tab and then performance

@user-mc4hp7yy9r 8 ай бұрын

apart from bad code do we have any other scenario for heap issue ?

@digitak.middleware 8 ай бұрын

Memory leak Inadequate heap size Large or long lived objects To many threads GC settings Many more.....

@user-mc4hp7yy9r 6 ай бұрын

if suppose we have the user as "x" so x has given wrong password a couple of times account got locked how can we rectify this ?

@digitak.middleware 6 ай бұрын

You can disable locking

@user-mc4hp7yy9r 6 ай бұрын

how can we disable lock please let me know @@digitak.middleware

@user-mc4hp7yy9r 8 ай бұрын

with the use of garbage collection memory will get free right ? if heap usage growing up we can do garbage collection right ? then what is the use of heap dump ?

@digitak.middleware 8 ай бұрын

JVM automatically runs the GC and free the memory as and when required based on the utilization. Apart from that if you are doing any troubleshooting then you have the option to run it manually as well to free up memory. A heap dump is required to understand which code is taking high memory.

@digitak.middleware 8 ай бұрын

@user-mc4hp7yy9r 6 ай бұрын

is weblogic installation file system and weblogic logs file systems both are same ?

@digitak.middleware 6 ай бұрын

It can be the same or different depending on the customize configurations

@user-mc4hp7yy9r 10 ай бұрын

when we will use jmap command will it be in already crashed instance or it is from running instance ?

@digitak.middleware 10 ай бұрын

You need to specify the process I'd with jmap, so that means server should be running but performance is very slow, hanging or heap utilization is very high

@user-mc4hp7yy9r 10 ай бұрын

oh thank you sir thanks for your immediate response@@digitak.middleware

@user-mc4hp7yy9r 9 ай бұрын

Hi Sir, how companies will maintain weblogic production server configuration generally is it like 4gb ram,250gb disk or they will maintain high configuration? they might be used as per application size but please tell me generally how they can maintain production environment?

@digitak.middleware 9 ай бұрын

It depends on the load on applications. In production you can see jvm size from merely few gb till 80 gb or more based on the utilization and application types. .

@user-mc4hp7yy9r 9 ай бұрын

thank you sir@@digitak.middleware

@user-mc4hp7yy9r 6 ай бұрын

product related information in which file can we find ?

@digitak.middleware 6 ай бұрын

there are few XML files inside Oracle home like inventory, contentxml etc. you check for all files

@user-mc4hp7yy9r 6 ай бұрын

in which file core dump will be stored ?

@digitak.middleware 6 ай бұрын

A core dump file created inside domain directory

@user-mc4hp7yy9r 2 ай бұрын

visualvm available in java home ?

@digitak.middleware 2 ай бұрын

No, now you have to install separately

@user-mc4hp7yy9r 6 ай бұрын

how can we do user unlock ?

@digitak.middleware 6 ай бұрын

From console - domain - security

@user-mc4hp7yy9r 6 ай бұрын

what is inode ?

@digitak.middleware 6 ай бұрын

An inode is a data structure on a file system that stores information about a file or a directory. It typically includes details such as the file's permissions, owner, size, timestamps, and pointers to the actual data blocks on the disk.

@user-mc4hp7yy9r 6 ай бұрын

how can we analyse server crash ?

@digitak.middleware 6 ай бұрын

Are you talking about using core dump or server logs?

@user-mc4hp7yy9r 6 ай бұрын

using core dump please explain sir@@digitak.middleware