HI,
Have experienced this in the past in instances where we see the Index server restarting after query executions/I saw one instance where two large tables were joined and the query resulted in a index server dump.
Am not sure of all the reasons why Index Server will restrat - but the basis team wll have to ensure enough memory is availble to execute a query.
If any of the experts are aware of other reasons why this could happen, please do share.
Thanks
Sudarshan