RE: Postgres JDBC Driver : java.lang.OutOfMemoryError

Hi Peter,

Thanks a lot. It worked : java -xmx128m my.app.classfile

So, it turned out to be the JVM  memory heap size issue - not a JdbcDriver
issue.

The resultset was really not that big !

But the jdbcDriver does have hardcoded values 8192 etc. at lot of places in the
PG_Stream, connection and other classes.

Thanks again
Anil






Peter Mount <petermount@maidstone.gov.uk> on 12/08/2000 05:11:42 PM

To:   Anil Diddi/HSS@HSS, pgsql-interfaces@postgresql.org
cc:

Subject:  RE: [INTERFACES]Postgres JDBC Driver : java.lang.OutOfMemoryError




How big is the ResultSet?

By default the JVM alocates 64Mb of memory. To increase this, you pass the
-Xmx parameter to java, ie:

java -Xmx32m my.app.classfile

where 32m is 32Meg of memory maximum.

From SUN's docs:

-Xmsn
Specify the initial size, in bytes, of the memory allocation pool. This
value must be a multiple of 1024 greater than 1MB. Append the letter k or K
to indicate kilobytes, or m or M to indicate megabytes. The default value is
2MB. Examples:      -Xms6291456      -Xms6144k      -Xms6m


-Xmxn
Specify the maximum size, in bytes, of the memory allocation pool. This
value must a multiple of 1024 greater than 2MB. Append the letter k or K to
indicate kilobytes, or m or M to indicate megabytes. The default value is
64MB. Examples:      -Xmx83886080      -Xmx81920k      -Xmx80m

--
Peter Mount
Enterprise Support Officer, Maidstone Borough Council
Email: petermount@maidstone.gov.uk
WWW: http://www.maidstone.gov.uk
All views expressed within this email are not the views of Maidstone Borough
Council


> -----Original Message-----
> From: adiddi@hss.hns.com [mailto:adiddi@hss.hns.com]
> Sent: Friday, December 08, 2000 10:50 AM
> To: pgsql-interfaces@postgresql.org
> Subject: [INTERFACES]Postgres JDBC Driver : java.lang.OutOfMemoryError
>
>
>
>
>
> Hi ,
>
> Will appreciate any help in resolving the following exception:
>
> PostGreSQL : 7.0.2
>
> Exception occurred during event dispatching:
> java.lang.OutOfMemoryError:
>         at org.postgresql.PG_Stream.ReceiveString(PG_Stream.java:250)
>         at
> org.postgresql.Connection.ReceiveFields(Connection.java:447)
>         at org.postgresql.Connection.ExecSQL(Connection.java:419)
>         at org.postgresql.jdbc1.Statement.execute(Statement.java:269)
>         at
> org.postgresql.jdbc1.Statement.executeQuery(Statement.java:53)
>         .....
>
> Thanks
> Anil
>
>