Rollback in ProC caused memory leak?

We recently encountered a quite intriguing memory leak problem coming from the following Oracle Pro*C routine:

	#include <sqlca.h>
	#include <DBIntf.h>
	
	long RollbackData (void *ConnectID)
	{
		long ErrorCode;
	
		EXEC SQL ROLLBACK;
		ErrorCode = sqlca.sqlcode;
	
		return (ErrorCode);
	}

Every time this routine was executed, we can observed several 32-byte nodes were added to the ever growing doubly-linked list by examining the heap memory map.

Some characteristic of our server application:

• the server is compiled with Pro*C/C++: Release 2.2.2.0.0 running on HPUX 10.01 and accessing Oracle server 7.3.2.
• it uses ProC to connect and access the oracle database.
• after the connection, the server will run continuously for six days before shut down on Sunday.
• the server is reading requests from the message queue thus no fork was done.
• the server processes roughly 1500 transactions an hour.
• the server is leaking memory at a rate of 160K bytes per hour. So after 6 days, the server's heap size will grow roughly 24M bytes more.
• there are 18 identical server processes running at the same time, so after 6 days, the total memory usage for those server is roughly 450M bytes.
• many requests to the server were error thus the above rollback ProC routine were called frequently.

It seemed that when doing a rollback, Oracle/ProC was keeping a history or journal of some sort. And this list seemed like a privately maintained global doubly-linked list. A typical node of the list looked like the following:

	0x0000beef   0x403422c8  0x40342318   0x8b01d217
	0x00000000   0x16004353  0x0000beef   0x8b01d217

Where 0x0000beef looks like a magic word, 0x403422c8 is the left pointer, and 0x40342318 is the right pointer of a doubly-linked list. I was able to confirmed that 0x0000beef word also appeared in libsql.a so this node structure seemed to be defined in libsql.a.

Now the tough question, how do we tell Oracle/ProC not to maintained this ever growing internal list? Thanks in advance for your help.

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| Nick Chen 703-713-2584            |

| AT&T, Herndon, VA                 |

| ccserve!nchen_at_polaris.attmail.com |

| nickchen_at_attmail.com              |

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--
+-----------------------------------+


| Nick Chen 703-713-2584            |

| AT&T, Herndon, VA                 |

| ccserve!nchen_at_polaris.attmail.com |

| nickchen_at_attmail.com              |

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