Tagged Questions
0
votes
1answer
76 views
Parameter triggers different execution plan, but why?
I have a table
CREATE TABLE [dbo].[Numbers]
(
[Date] [date] NULL,
[Time] [time](3) NULL,
[Value] [char](10) NULL
)
and the table has > 10 Billion rows, therefore it ...
3
votes
1answer
237 views
Query Performance Issue
I have this below query which is behaving bit weird . well Weird in the sense that I couldn't find complete explanation for this.
Version : Sql Server 2008 R2 Enterprise
No fragmentation . ...
4
votes
2answers
176 views
Performance on SQL Join
I have a query which takes ages to run mainly due to a join between 2 tables on a PK and FK.
The Key is prefixed with 2 letters (which is always the same, RN) followed by 7 digits
So RN1234567 for ...
1
vote
0answers
204 views
Query tuning help needed (Hash Match and Table Scans)
I need help optimizing the following query (returning ~8k rows):
SELECT A.sys_id, 'AppSvrRels' = CAST(SUBSTRING((SELECT (', ' + T.name)
FROM (
...
1
vote
1answer
97 views
EXISTS and sub-query cost
i've just wondered if there's a difference in cost(memory,cpu) of an EXISTS or NOT EXISTS in following queries. Does it make a difference if i select NULL, 1 or columns?
1)
SELECT id
FROM Parent p
...
7
votes
3answers
1k views
TSQL performance - JOIN on value BETWEEN min and max
I have two tables in which I store:
an IP range - country lookup table
a list of requests coming from different IPs
The IPs were stored as bigints to improve lookup performance.
This is the table ...
0
votes
1answer
123 views
Help me to better design my query so I can gain more performance
I need to find so called first entry in database for items regarding their partners.
I wrote query and it is giving me correct results but it sucks with performances.
I suspect that I have missed ...
