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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