[Hello,
The firebird manual says that generators are thread-safe [1]. How does the
firebird engine guarantee that two consecutive executions of a "SELECT
NEXT VALUE FOR..." do not return the same value? Does it use a lock on the
RDB$GENERATOR table? Does the call to "SELECT NEXT VALUE..." bl
On Fri, Sep 23, 2011 at 2:18 PM, Matheus Degiovani
wrote:
>
> The firebird manual says that generators are thread-safe [1]. How does the
> firebird engine guarantee that two consecutive executions of a "SELECT
> NEXT VALUE FOR..." do not return the same value?
Generator values are stored on gene
Hello Ann,
>
> Generator values are stored on generator pages. In shared cache
> architectures (i.e. SuperServer) a connection that changes a generator
> value
> gets a transient write lock on the page, makes its change and releases
> the
> page.
This "page" is the mapping of a set of table
Hello Matheus,
>
> > Generator values are stored on generator pages. In shared cache
> > architectures (i.e. SuperServer) a connection that changes a generator
> > value
> > gets a transient write lock on the page, makes its change and releases
> > the
> > page.
>
> This "page" is the mapping of
On 26/09/11 17:06, Ann Harrison wrote:
>> Is there a way of finding out how many pages are used to store a given
>> table? Or documentation about how the mapping from tables to memory and
>> disk pages are implemented on firebird?
Maybe
http://www.firebirdsql.org/file/documentation/reference_manu
Hello Matheus,
>Is there a way of finding out how many pages are used to store a given
table?
Run gstat -r, there will be exact information - Data Pages: NNN
CFG (149)
Primary pointer page: 2736, Index root page: 2737
Average record length: 71.20, total records: 15549
Average v
On Tue, Sep 27, 2011 at 3:39 AM, Alexey Kovyazin wrote:
>
> >Is there a way of finding out how many pages are used to store a given
> table?
>
> Run gstat -r, there will be exact information
Alexey is exactly right, but gstat reads every data page and counts the
records and record versions on
