> First question:
> The example shows that the column number of type serial is incremented
> as if the preceding insert-statement was successfull, even if it was
> not.
> Are the values for the column number of type serial inserted into the
> corresponding
> sequence before the attempt to insert into the table and are not deleted
> if the
> latter fails ?
> But maybe this behaviour was intended to log succcessless attempts to
> insert into the table.
For performance reasons, failed INSERT's stull use a sequence number.
That way, multiple users can use the sequence without waiting to see if
the transactions commit. This is intended.
> Second question:
> The SEQUENCE corresponding to a column of type serial is not beeing
> droped
> automatically when the table containing the serial-column is droped.
> Does it make sense to store a sequence without a corresponding table ?
For SERIAL, it should drop the sequence but currently doesn't. As for
using sequences, you can use a sequence for multiple tables so automatic
dropping is probalby not what we want, _except_ for SERIAL.
--
Bruce Momjian | http://candle.pha.pa.us
pgman@candle.pha.pa.us | (610) 853-3000
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