[email protected] wrote:
Sorry for the delayed response. Since this list is shared for all
commons components, it's best to prefix the subject line, as I have
changed it above, to include the component name. See responses to your
questions below.
Hello,
I saw someone else ask this exact same question back in Dec but the reply
they received never really answered the question, so I thought I'd try
again.
I am using the dbcp included within Tomcat 5.5.27.
So should be dbcp 1.2.2, pool 1.4
I configure it using
context.xml with: maxActive="30" maxIdle="10"
I always assumed that maxActive would limit the total amount of DB
connections that could ever be open at one time (in this case 30).
That is correct.
Yet
from what I see it seems like I am limited to maxActive + maxIdle
connections open (in this case 40). Is that true?
No, maxActive should limit the total number of connections, idle in the
pool or checked out to clients.
Also, the default behavior seems to be that the connections never close (or
timeout) within the pool when they are not being used.
Yes, the default behavior is not to validate or time out connections
while they are idle in the pool. You can change this behavior by
setting timeBetweenEvictionRunsMillis and minEvictableIdleTimeMillis to
positive numbers. The first of these determines how often (in
milliseconds) the "idle object evictor" runs and the second (also in
milliseconds) determines how long a connection can sit idle in the pool
before it is eligible for "eviction."
I had my Tomcat
server sit there for about an hour idle with no client requests incoming
and when I ran netstat -a I still saw 39 connections open, they only closed
when I killed Tomcat. Do I have to turn on some kind of cleanup explicitly?
See comment above on timing out idle connections, though be careful
about setting this too aggressively as it can lead to connection churn.
The number of open connections - 39 - looks too large for the maxActive
setting above. Are you sure all of the connections were opened by the
connection pool?
Phil
thanks!
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