Re: Bug #434: Maximun number of connections

Hi Sergio,

There is a default value of 32 simulatanous connections in PostgreSQL's
"postgresql.conf" configuration file (in the data directory where your
database is). The parameter name is "max_connections".

It works quite fine if you change this value to be higher than 32, then
restart PostgreSQL. This value can also be altered at compile time to
whatever you want (32 is the default here and thats what gets passed to
the postgresql.conf file).

Hope this helps.

Regards and best wishes,

Justin Clift

pgsql-bugs(at)postgresql(dot)org wrote:
>
> Sergio Muscat (sergio(at)onvol(dot)net) reports a bug with a severity of 2
> The lower the number the more severe it is.
>
> Short Description
> Maximun number of connections
>
> Long Description
> What is the maximum number of connections that postgresql can support? I am writing a connection pool using jdbc/tomcat and when the number of connections exceeds about 30 items, an exception is raised saying 'sorry too many clients already'. Is this normal? See below for a dump of the exception.
>
> Regards,
>
> Sergio
>
> Sample Code
> Something unusual has occured to cause the driver to fail. Please report this exception: java.sql.SQLException: Sorry, too many clients already
> at org.postgresql.Driver.connect(Driver.java:125)
> at java.sql.DriverManager.getConnection(DriverManager.java:517)
> at java.sql.DriverManager.getConnection(DriverManager.java:177)
> at odrs.db.DBConnectionPool.<init>(DBConnectionPool.java:54)
> at odrs.db.DBConnectionPool.getDBConnection(DBConnectionPool.java:74)
> at odrs.sql.ClientLoginBean.<init>(ClientLoginBean.java:29)
> at java.lang.Class.newInstance0(Native Method)
> at java.lang.Class.newInstance(Class.java:237)
> at java.beans.Beans.instantiate(Beans.java:207)
> at java.beans.Beans.instantiate(Beans.java:51)
> at jsp._0002fjsp_0002fmainPage_0002ejspmainPage_jsp_0._jspService(_0002fjsp_0002fmainPage_0002ejspmainPage_jsp_0.java:75)
> at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
> at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:177)
> at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:318)
> at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:391)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
> at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
> at org.apache.tomcat.core.Handler.service(Handler.java:286)
> at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
> at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:797)
> at org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
> at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:210)
> at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
> at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
> at java.lang.Thread.run(Thread.java:484)
>
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>
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