| From: | Jonathan Bartlett <johnnyb(at)eskimo(dot)com> |
|---|---|
| To: | Shridhar Daithankar <shridhar_daithankar(at)persistent(dot)co(dot)in> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Using oids |
| Date: | 2003-09-03 19:55:18 |
| Message-ID: | Pine.GSU.4.44.0309031253190.23907-100000@eskimo.com |
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| Lists: | pgsql-general pgsql-hackers |
> About oids not being unique, oids can assume 4 billion different values. If you
> have more than those many rows in a table, oids will wrap around and will no
> longer be unique in that object.
Not quite. After 4 billion inserts (even spread across millions of
tables), you run out of OIDs and they will no longer be unique. OIDs I
think were originally meant to be globally unique identifiers, but they
are no longer so, and are really no longer useful. When I want globally
unique identifiers, I use an int8 column + sequence.
Jon
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