On 10.01.2017 17:10, Joleen Barker wrote:
Hello All,
Details:
Tomcat Version: 7.0.64.0
Java Version: 1.8.0
OS: AIX 6.1
Database: Oracle 11
The web application installed on the server above makes data connections to
run file transfers from point A to point B. The default Database connection
setting that are set when the application server comes up are as follows:
DataBasePoolingFlag - APACHE
MaxActive - 400
MaxIdle - 20
MinIdle - 10
We had an incident where all these connections were actually used up due to
a script someone had that looped. I need to determine at any given point in
time how many DB connections exist from the web application to the DB.
There may be more than one way to do this. I am sure there is a DB command
that could be run against the schema but the schema is pointed to by many
servers. I am wondering if there is a java command of some kind that I
could run that may tell me how many connections are open at that time or
possibly a tomcat or apache command.
Thank you for the help in advance.
Hi.
Maybe an "out of the box" answer, not using java.
I don't know how the following commands fare under AIX, but on a Linux system, the
OS-level command :
~# netstat -pan --tcp | grep ESTABLISHED
will show you pretty much all TCP connections that are established between any process and
any other, local or remote.
Sample output :
tcp6 0 0 127.0.0.1:45095 127.0.0.1:11002 ESTABLISHED
11096/java
tcp6 0 0 127.0.0.1:8009 127.0.0.1:53564 ESTABLISHED
2677/java
tcp6 0 0 127.0.0.1:8009 127.0.0.1:53677 ESTABLISHED
2677/java
tcp6 0 0 127.0.0.1:8009 127.0.0.1:53659 ESTABLISHED
2677/java
tcp6 0 0 127.0.0.1:8009 127.0.0.1:53656 ESTABLISHED
2677/java
tcp6 0 0 127.0.0.1:8009 127.0.0.1:53620 ESTABLISHED
2677/java
tcp6 0 0 127.0.0.1:8009 127.0.0.1:53608 ESTABLISHED
2677/java
tcp6 0 0 127.0.0.1:45142 127.0.0.1:11002 ESTABLISHED
11096/java
tcp6 0 0 127.0.0.1:43558 127.0.0.1:11002 ESTABLISHED
11096/java
tcp6 0 0 127.0.0.1:45128 127.0.0.1:11002 ESTABLISHED
11096/java
tcp6 0 0 127.0.0.1:45069 127.0.0.1:11002 ESTABLISHED
11096/java
I presume that you could easily find out the process-id of your Tomcat, and the port
number under which the database is accessed.
It would be a simple matter to "grep" the above and count the lines, to get the answer you
seem to want.
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