A. Kretschmer wrote:
> am Thu, dem 24.07.2008, um 10:01:46 -0400 mailte Emi Lu folgendes:
>> A. Kretschmer wrote:
>>> am Thu, dem 24.07.2008, um 9:47:48 -0400 mailte Emi Lu folgendes:
>>>> I found a link for SQL Server, it applies to PostgreSQL 8.0.x as well?
>>>> http://vadivel.blogspot.com/2004/06/delete-vs-truncate-statement.html
>>> Not realy, for instance, pg can rollback a truncate, and a sequence are
>>> not reset.
>>>
>>>
>> Thank you. I am quite sure that I will not use "delete" now.
>> Now I a question about how efficient between
>>
>> (1) truncate a big table (with 200, 000)
>> vacuum it (optional?)
>
> not required
>
>
>> drop primary key
>> load new data
>> load primary ke
>> vacuum it
>
> analyse it, instead vacuum.
It gets more and more clear to me know!
I guess I need only do analyze(primary key column) after loading data.
The new picture will be:
. truncate table
. drop primary key
. load data
. set primary key
. analyze interesting columns