Bugs item #2636813, was opened at 2009-02-25 12:51
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Category: General
Group: Sedna (current)
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Dmitry A. Shaporenkov (dsha)
Assigned to: Nobody/Anonymous (nobody)
Summary: Sedna Processes and Reliability

Initial Comment:
There are currently (build 3.1.175) multiple issues with regard to Senda 
reliability as a server-side DBMS.  My OS is Windows Server 2003.

1) se_trn.exe process may crash because of (say) infinite recursion in XQuery 
(apparently causing stack overflow), invalid characters and so on. When a crash 
happens, the system dialog shows up prompting to debug the process.

Suggestion: Add something like top-level exception handler to se_trn.exe code, 
so that even if fatal exception occurs, the process still finishes gracefully 
with appropriate diagnostic information. On Windows, the event log is a good 
place where to submit diagnostic information.

2) Under no condition should a crash in se_trn.exe take down the whole Sedna 
governor process, se_gov.exe, with all the databases it governs and all other 
se_trn.exe processes executing clients' queries. It's an absolute shame that 
this still happens at the moment of writing.  This behavior is absolutely 
unacceptable for any server-side system. After all, process isolation is all 
about security and reliability, and here we observe the opposite picture. 

Suggestion: se_gov.exe should survive and databases continue to run regardless 
what happens to any of se_trn.exe process.

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