On Wed, Apr 25, 2012 at 9:28 AM, Merlin Moncure mmonc...@gmail.com wrote:
That patch actually has more than one optimization in it, I think, but
the basic idea is that if we could figure out a way to set
HEAP_XMIN_COMMITTED when loading data into a table created or
truncated within the same
On Tue, Apr 24, 2012 at 3:40 PM, Robert Haas robertmh...@gmail.com wrote:
On Sat, Apr 21, 2012 at 7:08 PM, Greg Stark st...@mit.edu wrote:
The earlier consensus was to move all the hint bits to a dedicated
area and exclude them from the checksum. I think double-write buffers
seem to have
On Tue, Apr 24, 2012 at 8:52 PM, Greg Stark st...@mit.edu wrote:
On Tue, Apr 24, 2012 at 9:40 PM, Robert Haas robertmh...@gmail.com wrote:
For three things, index pages
have hint-type changes that are not single-bit changes.
? Just how big are these? Part of the reason hint bit updates are
On Sat, Apr 21, 2012 at 5:40 PM, Jeff Davis pg...@j-davis.com wrote:
* In addition to detecting random garbage, we also need to be able to
detect zeroing of pages. Right now, a zero page is not considered
corrupt, so that's a problem. We'll need to WAL table extension
operations, and we'll
On Sat, Apr 21, 2012 at 7:08 PM, Greg Stark st...@mit.edu wrote:
The earlier consensus was to move all the hint bits to a dedicated
area and exclude them from the checksum. I think double-write buffers
seem to have become more fashionable but a summary that doesn't
describe the former is
On Tue, Apr 24, 2012 at 9:40 PM, Robert Haas robertmh...@gmail.com wrote:
For three things, index pages
have hint-type changes that are not single-bit changes.
? Just how big are these? Part of the reason hint bit updates are safe
is because one bit definitely absolutely has to be entirely in
On 4/21/12 2:40 PM, Jeff Davis wrote:
If we do use WAL for hint bit updates, that has an impact on Hot
Standby, because HS can't write WAL. So, it would seem that HS could not
set hint bits.
If we're WAL-logging hint bits, then the standby would be receiving
them, so it doesn't *need* to write
A lot of discussion took place regarding corruption detection, and I am
attempting to summarize it in a useful way. Please excuse the lack of
references; I'm hoping to agree on the basic problem space and the
nature of the solutions offered, and then turn it into a wiki where we
can get into the
On Sat, Apr 21, 2012 at 10:40 PM, Jeff Davis pg...@j-davis.com wrote:
* In addition to detecting random garbage, we also need to be able to
detect zeroing of pages. Right now, a zero page is not considered
corrupt, so that's a problem. We'll need to WAL table extension
operations, and we'll
