| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | "Bagga, Rishu" <bagrishu(at)amazon(dot)com> |
| Cc: | "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: SLRUs in the main buffer pool - Page Header definitions |
| Date: | 2022-06-22 21:39:43 |
| Message-ID: | 20220622213943.drj7fni2usgo6owy@alap3.anarazel.de |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
Hi,
On 2022-06-22 21:06:29 +0000, Bagga, Rishu wrote:
> 3. A flag to identify if the page is a relational or BufferedObject
Why is this needed in the page header?
> Using the new BufferedObject page header will be space efficient but
> introduces a significant change in the codebase to now track two types
> of page header data. During upgrade, all SLRU files that exist on the
> system must be converted to the new format with page header. This will
> require rewriting all the SLRU pages with the page header as part of
> pg_upgrade.
How are you proposing to deal with this in the "key" to "offset in SLRU"
mapping? E.g. converting a xid to an offset in the pg_xact SLRU. I assume
you're thinking to deal with this by making the conversion math a bit more
complicated?
Greetings,
Andres Freund
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Zheng Li | 2022-06-22 22:22:00 | Re: Support logical replication of DDLs |
| Previous Message | Bagga, Rishu | 2022-06-22 21:06:29 | SLRUs in the main buffer pool - Page Header definitions |