All Questions
Tagged with recursive query-performance
12 questions
0
votes
0
answers
235
views
Optimising a recursive SQL query that processes several million records in BQ
I need help optimizing a recursive SQL query in BQ.
I have hierarchical data stored in a table as parent-child relationships, i.e
will be stored as
parent_item_id
child_item_id
1
1
1
2
1
3
3
4
...
- 101
0
votes
0
answers
384
views
How to optimize (or get an alternative faster solution to) this recursive query that groups using recursive CTEs in Postgres?
I am on the quest to implement an NMS filter for labels in a Database.
For context, here's a link to my first question, where I explain what NMS is and what I'm trying to achieve (I will edit that ...
- 51
0
votes
1
answer
116
views
Optimizing query that finds closest unique records
I've been trying out different queries to get the best performance when querying hierarchical data on Postgres 13.6.
Fiddle: https://dbfiddle.uk/060f_h96
Explain: https://explain.dalibo.com/plan/...
4
votes
1
answer
2k
views
How to optimize a recursive query in Postgresql?
I have a recursive query that takes too long - 30+ ms where doing the individual queries to extract the same data manually takes < 0.12 ms. So we're talking 250x as long.
I have the following ...
- 187
0
votes
1
answer
1k
views
Filtering a recursive CTE as view
i'm using MSSQL Server 2017 and have a CTE used in a view to get the root element of a hirarchical tree linked to one specific element.
If the CTE is used directly and the base elements are allready ...
- 3
2
votes
2
answers
3k
views
Optimizing a recursive CTE or replacing it with a temporary table
I have a recursive query like this:
with recursive PCte(id) as
(
select p1.id from Product p1 where p1.parent_id is null and p1.serial_number in
('123', '124','125', 'n')
union all
...
3
votes
2
answers
560
views
Optimization of recursive view
I have an optimization problem when using a recursive view on PostgreSQL. When I perform a trivial query using this view, the execution time is abnormally long.
To expose my problem, here is a ...
0
votes
0
answers
31
views
Fastest way of updating a spider web of data
I have a large table with over 60 million rows, which has relational data inside of it. I need to update each of these rows to the newest date, of the newest member, including members that that ...
- 1
5
votes
1
answer
324
views
Why does this CTE return the bulk of its results immediately, but then take several minutes to finish?
I've got a schema roughly like this (this is a simplification of my actual schema):
CREATE TABLE foo (
key1 NUMERIC(6) NOT NULL,
key2 VARCHAR(32) NOT NULL,
val VARCHAR(255) NULL,
...
- 163
4
votes
1
answer
11k
views
Recursive cte avoiding loops
I'm trying to write a recursive CTE to explore a workflow system. Unfortunately, I'm getting maximum recursion errors due to loops:
with cteActs as
(
select a.id as [id], aa.TASKNEXTID as [...
- 1,463
4
votes
3
answers
2k
views
Best way to design / query multi-level relationship table
My company is going to develop a mobile app selling services across different regions. We are expecting users are going to hugely depend on the Search function. Thus, I need to make sure the database ...
- 41
2
votes
1
answer
3k
views
Finding the end of a Relationship chain optimally
I have a table that contains an id column, a parent column, and it's child column. So for every record, I know what record comes before it and what will come after it in a chain relationship, but from ...
- 503