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what does V$CURRENT_BLOCK_SERVER.ZERO_RESULTS stand for ?

edited Jul 16, 2016 5:00AM in Database Administration (MOSC) 2 commentsAnswered

Description of V$CURRENT_BLOCK_SERVER.ZERO_RESULTS is the following:

Number of requests for which changes were rolled out of the block

returned to the requesting instance. Only zero-XID transactions can use

the block.

Then I have 2 questions:

1、What on earth is zero-XID transactions ?

2、Under what scenarios can this kind of transactions be seen ?

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