Hi Stefan, Nice talking to you again! Sorry my query in the image didn't show up, so I paste it in text now. The query is a simple select with equals. ======================================== sql>select * from id14 where id=1461; +------+-------+------+ | id | label | cid | +======+=======+======+ | 1461 | false | 0 | +------+-------+------+ 1 tuple (104.549ms) sql> sql> sql>select row_number() over (),* from storage() where "table"='id14'; +------+--------+-------+--------+---------+----------+----------+---------+-----------+------------+----------+----------+-------+----------+--------+-----------+--------+----------+------+ | L5 | schema | table | column | type | mode | location | count | typewidth | columnsize | heapsize | hashes | phash | imprints | sorted | revsorted | unique | orderidx | L5 | +======+========+=======+========+=========+==========+==========+=========+===========+============+==========+==========+=======+==========+========+===========+========+==========+======+ | 1 | sys | id14 | id | bigint | writable | 12/1244 | 2811606 | 8 | 22492848 | 0 | 28049448 | false | 0 | false | false | null | 0 | 1 | | 2 | sys | id14 | label | boolean | writable | 02/254 | 2811606 | 1 | 2811606 | 0 | 0 | false | 0 | null | null | null | 0 | 2 | | 3 | sys | id14 | cid | bigint | writable | 12/1231 | 2811606 | 8 | 22492848 | 0 | 0 | false | 0 | false | false | null | 0 | 3 | +------+--------+-------+--------+---------+----------+----------+---------+-----------+------------+----------+----------+-------+----------+--------+-----------+--------+----------+------+ 3 tuples (10.090ms) ===================================================== Best, Meng ------------------ Original ------------------ From: "Stefan Manegold";<Stefan.Manegold@cwi.nl>; Date: Jul 19, 2017 To: "Communication channel for MonetDB users"<users-list@monetdb.org>; Subject: Re: how to know imprints take effect? Hi Meng, most important question: From what kind of queries do you expect millisecond responses over a table of 15,000,000 rows? Thanks! Best, Stefan ----- On Jul 19, 2017, at 12:37 PM, integrity 357416268@qq.com wrote:
Hi all,
I am back, and I am using MonetDB Dec2016-SP5 with "enable-optimize" to do graph computing. I remember that imprints are suitable for all numeric types, however, after querying on the bigint column for many times, I found there is no imprints.
What I want to achieve is to "make" MonetDB respond in milliseconds, although I know that in MonetDB it is not necessary to create index like imprints. So, on a table of 15,000,000 rows, can I expect to get response in milliseconds? and whether imprints will help with this?
Any comments is appreciated!
Best regards, Meng
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