“tail -f” vs “tail -F”: Do you know the difference?

Hi all!
Do you know the difference between “tail -f” and “tail -F”?

duvida

Ok, don’t feel bad. It’s very difficult to find someone who knows… And with a reason, I can’t find any link explaining this by Googling.
It’s possible that I don’t know how to search it too. But I searched as I’d search if I didn’t know that… And couldn’t find anything about…

Let’s take a look on –help, so:

Continue reading

Avoiding lost messages in JDBC Persistent Store, when processing Global Transactions with JMS.

   A few months ago, i had a problem in Persistence Store of JMS queues, soon after perform server restart, I get error from persistence store to recover message:

weblogic.store.PersistentStoreFatalException: [Store:280064]invalid handle 55981 (server="EVENTS01" store="JDBCStore_3022" table="JDBCStore_3022WLStore"),

   To resolve this problem, just add this parameter on server startup arguments:

 -Dweblogic.store.StoreBootOnError = true

   With this parameter, the server starts with OK status in WebLogic 11g and with FAILED status in Weblogic 12c, but in both the processing of the messages continues when active,
to remove FAILED status in Weblogic 12c, just need to truncate persistence table in database and restart server (This solution can be found in Oracle Docs).

   This solution did not solved my problem, because I can’t lost or delete messages.

Let’s go analyse the problem:

Continue reading

Apache 2.4 with port redirect to Weblogic 12c

According Oracle guys, Apache 2.4 its is a vanila module to Weblogic 12c and same module runs with Weblogic 11g.

Modules are available to download:  https://blogs.oracle.com/WebLogicServer/entry/announcing_web_socket_proxy_and

# httpd -version
Server version: Apache/2.4.6 (Red Hat Enterprise Linux)
Server built:   Mar 21 2016 02:33:00

On httpd.conf is necessary to load Apache 2.4 module

LoadModule weblogic_module modules/lib/mod_wl_24.so

Continue reading

Configuration Coherence Server Out-of-Process in OSB 12C

Hello guys,

Today I’m going to introduce the Coherence Server Out-of-Process configuration.
Once this configuration has changed a lot between versions 11G to 12C, the post will be a little bit more detailed (than usual).

The table below summarize these changes:

From To
 osb-coherence-cache-config.xml Coherence Cache Config resource
 osb-coherence-override.xml Coherence Cluster resoruce
Out-Of-Process Cache Server New WLS node/cluster

 

Follow the steps:

Continue reading

Flashback – Part 5 (Flashback Table)

Hi everybody,

Today we are going to discuss about FLASHBACK TABLE. As usual, first, I am tagging here the previous posts about Flashback Technology, so feel free to check it out if you want:

Flashback – Part 1 (Flashback Drop)
Flashback – Part 2 (Flashback Query)
Flashback – Part 3 (Flashback Versions Query)
Flashback – Part 4 (Flashback Transaction Query)

So let’s do it people.

Continue reading