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From "Ibrahim (JIRA)" <derby-...@db.apache.org>
Subject [jira] Created: (DERBY-1713) Memory do not return to the system after Shuting down derby 10.2.1.0
Date Thu, 17 Aug 2006 10:25:13 GMT
Memory do not return to the system after Shuting down derby 10.2.1.0
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                 Key: DERBY-1713
                 URL: http://issues.apache.org/jira/browse/DERBY-1713
             Project: Derby
          Issue Type: Bug
          Components: Performance
    Affects Versions: 10.2.0.0
         Environment: Windows XP SP2
JRE 1.6 beta2
            Reporter: Ibrahim
            Priority: Critical


I face a problem when querying large tables. I run the below SQL and it stuck in this query
and throws java heap exception OutOfMemory:

SELECT count(*) FROM <table> WHERE .....

N.B. I'm using a database of more than 90,000 records (40 MB). I set the maxHeap to 32 MB
(all other settings have the default value, pageCache ... etc ). 

Then, I shutdown the database but the memory is not returned to the system (and remain 32
MB [max threshold]). I tried to increase the maxHeap to 128 MB in which it works and releases
the memory, so I think the problem is when it reaches the maxHeap then it seems to not respond
to anything such as closing the connection or shutting down the database. How can I get rid
of this? (because i cannot increase the maxHeap as the database increases, I want to throw
an exception and release the memory)

I'm using this to shutdown the DB:

try{DriverManager.getConnection("jdbc:derby:;shutdown=true");}
catch(SQLException ex){System.err.println("SQLException: " + ex.getMessage());}

I'm using a memory Profiler for monitoring the memory usage.

Thanks in advanced.

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