Re: why postgresql over other RDBMS

On 06/01/07 16:38, PFC wrote:
>
>>>>     Will the synchronized seq scan patch be able to do this by
>>>> issuing all  the CREATE INDEX commands at the same time from several
>>>> different database  connections ?
>>>  No, but it could someday.
>
>     Actually I tested, it does it right now, albeit unconsciously (pg
> doesn't do anything to synchronize the scans, but if you launch the
> concurrent connections at the same time and issue all your "create
> index" at the same time, only 1 table scan is needed). Maybe if the
> tables were bigger, it would lose sync between the 3 concurrent scans
> and would end up going slower. That's why I spoke about the
> "synchronized scan" patch.

How much of this, though, is from the OS's disk cache?  Or are Seq
Scans O_DIRECT and bypass the OS cache?

>> Or would a "CREATE MANY INDEXES" (where in one statement you specify
>> all the indexes on a single table) command be easier to implement?
>
>     You can get the effect right now by using concurrent connections it
> seems. Not very practical in a psql script, though...

--
Ron Johnson, Jr.
Jefferson LA  USA

Give a man a fish, and he eats for a day.
Hit him with a fish, and he goes away for good!