Numerics are a LOT slower than reals. Integers are faster than anything
I guess.
Chris
Mark Wong wrote:
> I don't remember making a conscious decision between the number and integer
> database type. Is that a significant oversight on my part?
>
>
> On Fri, Oct 31, 2003 at 08:04:34PM -0500, Rod Taylor wrote:
>
>>Excellent.
>>
>>I just noticed that most of the numbers in the system are given the
>>numeric data type. Is there any particular reason you don't use integer
>>(test enforced?)?
>>
>>On Fri, 2003-10-31 at 19:18, markw@osdl.org wrote:
>>
>>>I thought someone might be interested in a data point I have comparing
>>>7.3.4 and 7.4beta5 with results from our DBT-2 workload. Keep in mind I
>>>haven't done much tuning with either version. The following links have
>>>references iostat, vmstat, sar, readprofile (linux kernel profile), and
>>>oprofile (postgresql profile) statistics.
>>>
>>>Results from 7.3.4:
>>> http://developer.osdl.org/markw/dbt2-pgsql/184/
>>> - metric 1354.58
>>>
>>>Results from 7.4beta5
>>> http://developer.osdl.org/markw/dbt2-pgsql/188/
>>> - metric 1446.01
>>>
>>>7.4beta5 offers more throughput. One significant difference I see is in
>>>the oprofile for the database. For the additional 7% increase in the
>>>metric, there are about 32% less ticks in SearchCatCache.
>>>
>>>These are the only database parameters I've explicitly set for each one,
>>>any other differences will be differences in default values:
>>> - shared_buffers = 40000
>>> - tcpip_socket = true
>>> - checkpoint_segments = 200
>>> - checkpoint_timeout = 1800
>>> - stats_start_collector = true
>>> - stats_command_string = true
>>> - stats_block_level = true
>>> - stats_row_level = true
>>> - stats_reset_on_server_start = true
>>>
>>>If anyone has any tuning recommendations for either 7.3 or 7.4, I'll be
>>>happy to try them. Or if anyone wants to be able to poke around on the
>>>system, we can arrange that too. Feel free to ask any questions.
>
>
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