Commit/prepare position in ALL stream

EventStoreDB
#1

Hello,

Wanted to make sure my understanding is right on the ALL stream - specifically, do the commit/prepare position always increase monotonically?

For events A and B, if A after B in ALL stream: commitPosition(A) >= commitPosition(B) and preparePosition(A) > preparePosition(B) ?

Also, what is the logic behind the growth of commit/prepare positions? We have about ~300k events in our test environment (including the $stats) and the commit position is at 12 billion.

Thanks in advance

#2

This is correct but you shouldn’t need to be dealing with this directly.

As for what they are they represent the logical log points of a journal at the time of writing (does not match physical).

Cheers,

Greg

#3

Hi,

minor correction

you should check preparePosition(A) > preparePosition(B) if and only if commitPosition(A) == commitPosition(B).

It is possible to have (at least in case of explicit transactions) when

commitPosition(A) > commitPosition(B) but

preparePosition(A) < preparePosition(B)

In the case above event A is after the event B as it was committed later.

-yuriy

#4

yes