Ron Mayer napsal(a):
Tom Lane wrote:
Another issue is that it might not be possible to update a page for
lack of space. Are we prepared to assume that there will never be a
transformation we need to apply that makes the data bigger? In such a
situation an in-place update might be impossible,
Bruce Momjian napsal(a):
Heikki Linnakangas wrote:
Zdenek Kotala wrote:
4) Implementation
The main point of implementation is to have several version of
PageHeader structure (e.g. PageHeader_04, PageHeader_03 ...) and correct
structure will be handled in special branch (see examples).
(this
Zdenek Kotala [EMAIL PROTECTED] writes:
It does not solve problems for example with TOAST tables. If chunks does not
fit
on a new page layout one of the chunk tuple have to be moved to free page. It
means you get a lot of pages with ~2kB of free unused space. And if max chunk
size is
Heikki Linnakangas wrote:
Zdenek Kotala wrote:
4) Implementation
The main point of implementation is to have several version of
PageHeader structure (e.g. PageHeader_04, PageHeader_03 ...) and correct
structure will be handled in special branch (see examples).
(this won't come as
On Jun 11, 2008, at 10:42 AM, Heikki Linnakangas wrote:
Another issue is that it might not be possible to update a page for
lack of space. Are we prepared to assume that there will never be a
transformation we need to apply that makes the data bigger?
We do need some solution to that. One
Tom Lane wrote:
Another issue is that it might not be possible to update a page for
lack of space. Are we prepared to assume that there will never be a
transformation we need to apply that makes the data bigger? In such a
situation an in-place update might be impossible, and that certainly
Zdenek Kotala [EMAIL PROTECTED] writes:
There are examples:
void PageSetFull(Page page)
{
switch ( PageGetPageLayoutVersion(page) )
{
case 4 : ((PageHeader_04) (page))-pd_flags |= PD_PAGE_FULL;
break;
default
Zdenek Kotala wrote:
4) Implementation
The main point of implementation is to have several version of
PageHeader structure (e.g. PageHeader_04, PageHeader_03 ...) and correct
structure will be handled in special branch (see examples).
(this won't come as a surprise as we talked about this
Heikki Linnakangas [EMAIL PROTECTED] writes:
(this won't come as a surprise as we talked about this in PGCon, but) I
think we should rather convert the page structure to new format in
ReadBuffer the first time a page is read in. That would keep the changes
a lot more isolated.
The problem
Tom Lane napsal(a):
Zdenek Kotala [EMAIL PROTECTED] writes:
There are examples:
void PageSetFull(Page page)
{
switch ( PageGetPageLayoutVersion(page) )
{
case 4 : ((PageHeader_04) (page))-pd_flags |= PD_PAGE_FULL;
break;
Tom Lane wrote:
Heikki Linnakangas [EMAIL PROTECTED] writes:
(this won't come as a surprise as we talked about this in PGCon, but) I
think we should rather convert the page structure to new format in
ReadBuffer the first time a page is read in. That would keep the changes
a lot more isolated.
Heikki Linnakangas napsal(a):
Zdenek Kotala wrote:
4) Implementation
The main point of implementation is to have several version of
PageHeader structure (e.g. PageHeader_04, PageHeader_03 ...) and
correct structure will be handled in special branch (see examples).
(this won't come as a
Heikki Linnakangas napsal(a):
Tom Lane wrote:
Heikki Linnakangas [EMAIL PROTECTED] writes:
(this won't come as a surprise as we talked about this in PGCon, but)
I think we should rather convert the page structure to new format in
ReadBuffer the first time a page is read in. That would keep
Tom Lane [EMAIL PROTECTED] writes:
(Likely counterexample: adding collation info to text values.)
I don't think the argument really needs an example, but I would be pretty
upset if we proposed tagging every text datum with a collation. Encoding
perhaps, though that seems like a bad idea to me
Gregory Stark wrote:
Tom Lane [EMAIL PROTECTED] writes:
(Likely counterexample: adding collation info to text values.)
I don't think the argument really needs an example, but I
would be pretty
upset if we proposed tagging every text datum with a
collation. Encoding
perhaps, though
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