Hello, >Are there any other flag bits that we should or are planning to add into WAL >header newly, except the above two? If yes and they are required by even a >block which doesn't have an image, I will change my mind and agree to add >something like chunk ID to a block header. >But I guess the answer of the question is No. Since the flag bits now we are >thinking to add are required only by a block having an image, adding them into >a block header (instead of block image header) seems a waste of bytes in WAL. >So I concur with Michael. I agree. As per my understanding, this change of xlog format was to provide for future enhancement which would need flags relevant to entire block. But as mentioned, currently the flags being added are related to block image only. Hence for this patch it makes sense to add a field to XLogRecordImageHeader rather than block header. This will also save bytes per WAL record.
Thank you, Rahila Syed ______________________________________________________________________ Disclaimer: This email and any attachments are sent in strictest confidence for the sole use of the addressee and may contain legally privileged, confidential, and proprietary data. If you are not the intended recipient, please advise the sender by replying promptly to this email and then delete and destroy this email and any attachments without any further use, copying or forwarding. -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
