Hi Jeff,
On Tue, Jul 30, 2013 at 3:25 AM, Jeff Janes wrote:
> On Tue, Jul 23, 2013 at 10:56 PM, Amit Langote
> wrote:
>> On Wed, Jul 24, 2013 at 3:20 AM, Jeff Janes wrote:
>>>
>>> The heap structure used in external sorts is cache-unfriendly. The
>>> bigger the heap used, the more this unfrie
On Tue, Jul 23, 2013 at 10:56 PM, Amit Langote wrote:
> On Wed, Jul 24, 2013 at 3:20 AM, Jeff Janes wrote:
>>
>> The heap structure used in external sorts is cache-unfriendly. The
>> bigger the heap used, the more this unfriendliness becomes apparent.
>> And the bigger maintenance_work_mem, the
On Wed, Jul 24, 2013 at 3:20 AM, Jeff Janes wrote:
> On Mon, Jul 22, 2013 at 9:11 PM, Amit Langote wrote:
>> Hello,
>>
>> While understanding the effect of maintenance_work_mem on time taken
>> by CREATE INDEX, I observed that for the values of
>> maintenance_work_mem less than the value for whic
On Wed, Jul 24, 2013 at 11:30 AM, Amit Langote wrote:
> On Wed, Jul 24, 2013 at 6:02 AM, Jeff Janes wrote:
>> If you are using trace_sort to report that, it reports the switch as
>> happening as soon as it runs out of memory.
>>
>> At point, all we have been doing is reading tuples into memory.
On Wed, Jul 24, 2013 at 6:02 AM, Jeff Janes wrote:
> On Tue, Jul 23, 2013 at 1:23 AM, Amit Langote wrote:
>> On Tue, Jul 23, 2013 at 1:11 PM, Amit Langote
>> wrote:
>>> Hello,
>>>
>>> While understanding the effect of maintenance_work_mem on time taken
>>> by CREATE INDEX, I observed that for t
On Tue, Jul 23, 2013 at 1:23 AM, Amit Langote wrote:
> On Tue, Jul 23, 2013 at 1:11 PM, Amit Langote wrote:
>> Hello,
>>
>> While understanding the effect of maintenance_work_mem on time taken
>> by CREATE INDEX, I observed that for the values of
>> maintenance_work_mem less than the value for wh
On Mon, Jul 22, 2013 at 9:11 PM, Amit Langote wrote:
> Hello,
>
> While understanding the effect of maintenance_work_mem on time taken
> by CREATE INDEX, I observed that for the values of
> maintenance_work_mem less than the value for which an internal sort is
> performed, the time taken by CREATE
On Tue, Jul 23, 2013 at 1:11 PM, Amit Langote wrote:
> Hello,
>
> While understanding the effect of maintenance_work_mem on time taken
> by CREATE INDEX, I observed that for the values of
> maintenance_work_mem less than the value for which an internal sort is
> performed, the time taken by CREATE
Hello,
While understanding the effect of maintenance_work_mem on time taken
by CREATE INDEX, I observed that for the values of
maintenance_work_mem less than the value for which an internal sort is
performed, the time taken by CREATE INDEX increases as
maintenance_work_increases.
My guess is that
