On Wed, Mar 23, 2016 at 2:52 PM, Petr Jelinek <petr@2ndquadrant.com> wrote:
>> Second, if the other backend extended the relation in
>> some other manner and did not extend the FSM, how does calling
>> RecordAndGetPageWithFreeSpace help? As far as I can see,
>> GetPageWithFreeSpace and RecordAndGetPageWithFreeSpace are both just
>> searching the FSM, so if one is stymied the other will be too. What
>> am I missing?
>>
>
> The RecordAndGetPageWithFreeSpace will extend FSM as it calls
> fsm_set_and_search which in turn calls fsm_readbuf with extend = true.
So how does that help? If I'm reading this right, the new block will
be all zeroes which means no space available on any of those pages.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
