JNI interface - error creating buffer caches 1GB

Question

Hi,
I seem to be having a problem creating environments with a buffer cache of larger than 1GB. I get the following error, or similar:
(BDB v 4.3.29)
MapViewOfFile: Not enough space
PANIC: Not enough space
PANIC: DB_RUNRECOVERY: Fatal error, run database recovery
(and on BDB v 4.7.25)
MapViewOfFile: Not enough storage is available to process this command.
PANIC: Not enough space
PANIC: DB_RUNRECOVERY: Fatal error, run database recovery
unable to join the environment
I definitely have enough storage space available on the hard drive. This occurs whether I set the size of the buffer cache in code, or in the DB_CONFIG file. I have had the problem on both Linux and Windows and with BDB 4.3.29 and 4.7.25. I have also tried splitting the buffer cache into multiple files, this doesn't help, although in some situations I get a floating point error originating from inside the JNI library (I can provide more info on this if necessary).
Any suggestions? Is there a hard limit of 1GB that I've missed for buffer caches created over the BDB JNI interface? I wrote a quick C program to test this out, and managed to get the buffer cache up to ~2.5GB before I hit similar errors.
Thanks in advance for any advice.

Answer 1

Hi,
Thanks for the reply Sandra. Below is an example that causes this issue for me. As a quick aside, could this be an O/S / architecture limitation? I'm running a 32 bit O/S (XP SP2, Linux), could it be an issue with allocating that much addressable memory to a single process?
Many thanks
Code starts:
package main;
import java.io.File;
import java.io.FileNotFoundException;
import com.sleepycat.db.Database;
import com.sleepycat.db.DatabaseConfig;
import com.sleepycat.db.DatabaseException;
import com.sleepycat.db.DatabaseType;
import com.sleepycat.db.Environment;
import com.sleepycat.db.EnvironmentConfig;
public class TestBDB {
public static void main(String[] args)
EnvironmentConfig envConfig = new EnvironmentConfig();
envConfig.setInitializeCache(true);
envConfig.setAllowCreate(true);
DatabaseConfig dbConfig = new DatabaseConfig();
dbConfig.setType(DatabaseType.BTREE);
dbConfig.setAllowCreate(true);
Database db;
Environment env;
try
env = new Environment(new File("D:\\test"), envConfig);
db = env.openDatabase(null, "test.db", "test.db", dbConfig);
if (db != null)
db.close();
if (env != null)
env.close();
catch(FileNotFoundException e) {
e.printStackTrace();
catch (DatabaseException e) {
e.printStackTrace();
}