That sounds like a lot of constraints or am i wrong?
Il giorno gio 7 feb 2019, 20:19 Eve Freeman <eve.fre...@gmail.com> ha
scritto:
> Yes. You would need to add a constraint for each label + id combination.
>
> On Thu, Feb 7, 2019 at 1:57 PM Andrea Balzoni <
> andrea.balz...@keypartner.it> wrote:
>
>> Sadly the ids i'm trying to add are not going to be necessarily unique,
>> hence why i'm using merge. I think i grasped what a constrant is, but i
>> cant say the same about indexes. So you are telling me that adding a
>> constraint on ids would make the query faster? Sorry about questions that
>> might sound stupid, but i'm fairly new to neo4j...
>>
>> Il giorno gio 7 feb 2019, 18:59 Eve Freeman <eve.fre...@gmail.com> ha
>> scritto:
>>
>>> One other note--if you know these are unique ids, you can avoid using
>>> merge, and just use create, which will be quicker still.
>>>
>>> On Thu, Feb 7, 2019 at 12:54 PM Eve Freeman <eve.fre...@gmail.com>
>>> wrote:
>>>
>>>> Well, what a merge will do is check whether something exists before it
>>>> creates it, "match or create". The match step will get linearly slower as
>>>> it has to scan larger and larger lists of nodes on a label. If you add an
>>>> index (at minimum), or unique constraint/node key (preferred, especially if
>>>> you require uniqueness and will eventually have concurrent requests of this
>>>> nature), it will be able to do the match step much quicker.
>>>>
>>>> On Thu, Feb 7, 2019 at 12:50 PM Andrea Balzoni <
>>>> andrea.balz...@keypartner.it> wrote:
>>>>
>>>>> Honestly i heard of those, but i'm not using any. I'm quite new to it,
>>>>> so i wasnt sure what their purpose is.
>>>>>
>>>>> Il giorno gio 7 feb 2019, 18:43 Eve Freeman <eve.fre...@gmail.com> ha
>>>>> scritto:
>>>>>
>>>>>> What's your schema? Do you have a unique constraint or index on the
>>>>>> labels + id you're merging on?
>>>>>>
>>>>>> Eve
>>>>>>
>>>>>> On Thu, Feb 7, 2019 at 12:23 PM <andrea.balz...@keypartner.it> wrote:
>>>>>>
>>>>>>> Hello everyone, i'm trying to MERGE thousands of nodes using UNWIND
>>>>>>> and apoc procedures (for a dynamic label creation) using Java Driver as
>>>>>>> follows:
>>>>>>>
>>>>>>> String query =
>>>>>>> "UNWIND $nodes AS n " +
>>>>>>> "CALL apoc.merge.node([n.category], {id: n.id}, n)
>>>>>>> YIELD node RETURN node";
>>>>>>> session.run( query, params );
>>>>>>>
>>>>>>>
>>>>>>> My database contains something like 150k nodes divided by 16 labels
>>>>>>> and 130k relationships of the same type. It worked fine so far, it never
>>>>>>> failed to deliver, but now that i'm trying to create something like 4k
>>>>>>> new
>>>>>>> nodes and 5k new relationships at once it took more than 30 minutes. I
>>>>>>> feel
>>>>>>> like it should be way faster than this.
>>>>>>>
>>>>>>> Am i doing anything wrong? Is it really supposed to be this slow? Is
>>>>>>> there anything i can do to make this process smoother and to improve
>>>>>>> performances?
>>>>>>>
>>>>>>> Thanks in advance
>>>>>>>
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