Tagged Questions
4
votes
2answers
172 views
Is high Extent Fragmentation a problem?
DBCC SHOWCONTIG scanning 'MyTable' table...
Table: 'MyTable' (2048062382); index ID: 1, database ID: 28
TABLE level scan performed.
- Pages Scanned................................: 1019182
- Extents ...
0
votes
1answer
82 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 ...
1
vote
2answers
180 views
Query Performance Tuning on a huge table
I have the following table Transactions. The table looks like this:
CREATE TABLE [dbo].[Transactions](
[TransactionID] [bigint] IDENTITY(1,10) NOT NULL,
[PlayerID] [bigint] NOT NULL,
...
2
votes
0answers
80 views
How To Analyse Index Scans
I am using merge replication with SQL Server 2012.
During a sync using a merge agent there are a large number of index scans. I can see this by running a profile capturing SCAN:Started and ...
1
vote
1answer
385 views
Query performance of a NULL vs an empty ('') varchar in SQL Server 2012
I have 3 indexed fields in a query: int, int, and varchar(250).
The query performs well when all 3 conditions are specified with real values. The int columns always have values, but there are plenty ...
2
votes
0answers
71 views
In KB2658214, how does SQL Server know that “correlated AND predicates” are actually correlated?
While diagnosing SQL Server 2008 R2 queries with poor cardinality estimation (despite simple indexing, up-to-date statistics, etc.) and hence poor query plans, I found a perhaps-related KB article:
...
