What it mean, is it from current transaction point of view first snapshot, last
snapshot transaction what it is?
Can you explain value based on below points?
Let GLobal CN = 100 at this point.
1. Start transaction 1 snapshot
Here transaction level snapshot is created and it get an own snapshot number
(100, current value of Global CN)
2. Commit transaction 1
Transactin's snapshot is released.
Transaction's Commit Number is assigned (101, Global CN was incremented)
3. Start transaction 2 snapshot
Transaction level snapshot is created and it get an own snapshot number (101,
current value of Global CN)
4. Start transaction 3 snapshot
Transaction level snapshot is created and it get an own snapshot number (101)
5. Start transaction 4 read commited
No snapshot is created
6. read committed read consistency transaction start to execute some statement
Statement level snapshot is created and it get an own snapshot number (101)
Regards,
Vlad
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