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concurent selects
Posted by: Zsolt Kendi
Date: November 16, 2010 02:27PM

Looks like if for example two SELECT issued at a same time from different connection (process) then the folowing occured:

a). If directed to different table executed paralelly.
b). If directed to same table and have different xxx_PRIORITY the higher delay the execution of lower priority.
c). If directed to same table and have same xxx_PRIORITY then executed in sequence of arriving with blocking (by actually executed).

In case "c" exists any trick to enable concurrent execution like case "a". This can be prevent unwanted blocking of a fast query by slow qurey.

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