How to prevent session getting killed

Hi All,
I am trying to execute a procedure which contains a long running query .
The query takes so much time to execute that the session gets killed .
Can anybody please let me know what should I do to prevent my session being killed/
Is there any parameter to be set to do so?
Many thanks in advance.

try to avoid posting 2 questions for the same subject
Can I alter the default profile

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The weirdest of problems... Up until yesterday my tuxonice setup used to suspend/resume flawlessly. Some very rare lockups occured but I didn't mind. Since 2 days ago, my laptop resumes but the saved X session (xfce4) is killed and I'm presented with the gdm login screen. The only thing I can remember that changed is a regular update of the system:
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[2010-02-14 16:21] upgraded anki (0.9.9.8.5-2 -> 0.9.9.8.6-2)
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[2010-02-14 16:21] upgraded fuse (2.8.1-1 -> 2.8.3-1)
[2010-02-14 16:21] upgraded ghostscript (8.70-4 -> 8.71-1)
[2010-02-14 16:21] upgraded gnome-screensaver (2.28.1-1 -> 2.28.3-1)
[2010-02-14 16:21] upgraded gqview (2.0.4-2 -> 2.0.4-3)
[2010-02-14 16:21] upgraded gstreamer0.10 (0.10.25-1 -> 0.10.26-1)
[2010-02-14 16:21] upgraded gstreamer0.10-base (0.10.25-1 -> 0.10.26-1)
[2010-02-14 16:21] upgraded gstreamer0.10-base-plugins (0.10.25-1 -> 0.10.26-1)
[2010-02-14 16:21] upgraded gstreamer0.10-good (0.10.17-2 -> 0.10.18-1)
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[2010-02-14 16:21] upgraded kdebase-workspace (4.4.0-3 -> 4.4.0-4)
[2010-02-14 16:21] upgraded kdelibs (4.4.0-3 -> 4.4.0-4)
[2010-02-14 16:21] upgraded libidn (1.15-1 -> 1.16-1)
[2010-02-14 16:21] upgraded libisofs (0.6.26-1 -> 0.6.28-1)
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[2010-02-14 16:21] upgraded ntfs-3g (2009.11.14-1 -> 2010.1.16-1)
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[2010-02-17 09:45] upgraded imagemagick (6.5.9.0-2 -> 6.5.9.5-1)
[2010-02-17 09:45] upgraded lib32-curl (7.19.7-1 -> 7.20.0-1)
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I run a tailored-to-laptop vanilla kernel with the tuxonice patch and nvidia-beta-all, but neither was touched in any way before the problem started. During my tests, I left a screen session running
while sleep 1; do date >>/tmp/log ; ps ax >>/tmp/log ;echo ==================" >>/tmp/log; done
in case it caught anything strange, but it didn't. One ps ax showed xfce4 up, the next nothing. I realize of course this would be a long shot, given the 1s interval, but since the logs and dmesg didn't show anything, I grew kind of desperate.
Any ideas?

I dug a little deeper and found some more info, in daemon.log:
Feb 17 23:23:00 orion gdm-binary[2884]: WARNING: gdm_slave_xioerror_handler: Fatal X error - Restarting :0
And in Xorg.0.log.old:
Backtrace:
0: /usr/bin/Xorg (xorg_backtrace+0x28) [0x45a848]
1: /usr/bin/Xorg (0x400000+0x61989) [0x461989]
2: /lib/libpthread.so.0 (0x7f405f7c1000+0xee80) [0x7f405f7cfe80]
3: /usr/lib/xorg/modules/drivers/nvidia_drv.so (_nv001465X+0x16) [0x7f405ae1c256]
4: /usr/lib/libpixman-1.so.0 (0x7f405fe2c000+0xa6d2) [0x7f405fe366d2]
5: /usr/lib/libpixman-1.so.0 (0x7f405fe2c000+0x34a09) [0x7f405fe60a09]
6: /usr/lib/libpixman-1.so.0 (0x7f405fe2c000+0x2f13b) [0x7f405fe5b13b]
7: /usr/lib/libpixman-1.so.0 (0x7f405fe2c000+0x36e72) [0x7f405fe62e72]
8: /usr/lib/libpixman-1.so.0 (0x7f405fe2c000+0x381e0) [0x7f405fe641e0]
9: /usr/lib/libpixman-1.so.0 (0x7f405fe2c000+0x2ee4a) [0x7f405fe5ae4a]
10: /usr/lib/libpixman-1.so.0 (pixman_image_composite+0x17c) [0x7f405fe5bc7c]
11: /usr/lib/xorg/modules/libwfb.so (wfbComposite+0x1c0) [0x7f405a50eab0]
12: /usr/lib/xorg/modules/drivers/nvidia_drv.so (0x7f405ad4b000+0x32b8a5) [0x7f405b0768a5]
13: /usr/lib/xorg/modules/libxaa.so (0x7f405a0a2000+0x52a75) [0x7f405a0f4a75]
14: /usr/bin/Xorg (0x400000+0xaa720) [0x4aa720]
15: /usr/bin/Xorg (0x400000+0x11d7a9) [0x51d7a9]
16: /usr/bin/Xorg (0x400000+0x11da75) [0x51da75]
17: /usr/bin/Xorg (0x400000+0x11d276) [0x51d276]
18: /usr/bin/Xorg (0x400000+0x2f656) [0x42f656]
19: /usr/bin/Xorg (MapWindow+0x153) [0x4317c3]
20: /usr/bin/Xorg (0x400000+0x452f6) [0x4452f6]
21: /usr/bin/Xorg (0x400000+0x46024) [0x446024]
22: /usr/bin/Xorg (0x400000+0x219ec) [0x4219ec]
23: /lib/libc.so.6 (__libc_start_main+0xfd) [0x7f405ea6cb6d]
24: /usr/bin/Xorg (0x400000+0x21599) [0x421599]
Segmentation fault at address 0x2f0185
Fatal server error:
Caught signal 11 (Segmentation fault). Server aborting

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