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Memory leak with disconnected recordsets.
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From
30/05/2001 12:23:20
David Bennett
AdvoCare International LLC
Carrollton, Texas, United States
 
 
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General information
Forum:
Visual FoxPro
Category:
COM/DCOM and OLE Automation
Title:
Memory leak with disconnected recordsets.
Miscellaneous
Thread ID:
00512735
Message ID:
00512735
Views:
50
Hey guys, I've already posted this to microsoft.public.fox.programmer.exchange. I hope you don't mind...

Anyway, I'd been having a memory leak problem and finally narrowed it down to the following code snippet:
LOCAL oc, rs, i
oc = CREATEOBJECT("ADODB.CONNECTION")
oc.CursorLocation = 3 && ADUSECLIENT
oc.Open("Provider=SQLOLEDB;Data Source=SQLSERVER;" + ;
        "Database=pubs;User ID=sa;Password=;")
rs = CREATEOBJECT("ADODB.RECORDSET")
FOR i = 1 TO 10000
    WAIT WINDOW LTRIM(STR(i)) NOWAIT
    rs.ActiveConnection = oc
    rs.Open("SELECT getdate()")
    rs.ActiveConnection = .NULL. && Comment to plug the leak.
    rs.Close()
ENDFOR
oc.Close()
If you load up Performance Monitor and watch the Private Bytes of the VFP6 process, you'll see the memory usage skyrocket and never go back down. If you then comment out the line that disconnects the recordset (rs.ActiveConnection = .NULL.), the leak stops. Now, the exact same code in VB doesn't leak memory. So I'm pretty sure it's a VFP only thing. I've tested on VFP SP3/SP4/SP5, MDAC 2.5/2.6 running on both WIN2K SP2 and WINNT SP6. It appears to have been around for a long time. Has anyone else encountered this?

- david
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