While preparing for my SQL Saturday Salt Lake City presentation, Climbing the B-Tree, I ran into one of the “word of mouth” facts that the first column of an index should be highly selective, i.e., it should only point to one or a few rows. This is not always the case and I’ll show you […]
2023-01-02 (first published: 2020-09-16)
5,629 reads
In the last year I’ve published articles on indexes to include Indexes: When Column Selectivity Is Not Always A Requirement – SQLServerCentral and Query Optimizer Suggests Wrong Index and Query Plan -- Why? – SQLServerCentral. This article is a continuation of just how the optimizer interacts with the index wizard. We’ve all heard and read […]
2021-07-07
3,836 reads
A good example where the Query optimizer picks the wrong query plan and suggested index.
2021-02-25
5,190 reads
Continued analysis of index architecture with revised clustered index. Part 2 of Column Order Indexes
2020-12-11 (first published: 2019-04-24)
2,619 reads
Ever wonder about index column order; this piece should give some insight.
2020-12-04 (first published: 2019-02-28)
8,938 reads
Is there a difference between using TOP and MAX/MIN to return and end value to a table?
2020-08-14 (first published: 2018-12-17)
7,939 reads
In Part 1 of this article we looked at a specific use case (probably exaggerated) that gave us an idea about how CPU and IO performance might be affected by a bad page split. We continue this analysis looking at what really happens to the data on the leaf pages of a clustered index with […]
2020-07-02
4,523 reads
2020-03-03 (first published: 2019-11-25)
10,751 reads
Introduction Fill Factor is a parameter most of us have ignored because there is no definitive way to calculate what the correct value should be. Part 1 of this series describes a new technique to dynamically determine index fill factors for all indexes within a database. Part 2 covers an analysis of the data collection […]
2019-08-27
3,995 reads
Introduction So what’s all the fuss about Fill Factor? It is a SQL Server parameter I’ve ignored for 20+ years. The main reason was/is I’ve had no idea about what value to use. There is just no documented definitive guidance. Back in April at SQL Saturday #830 - Colorado Springs, I attended two sessions by […]
2019-08-20
9,095 reads
By James Serra
Most enterprise questions do not live neatly in one place. The numbers may be...
Redshift keeps its SYS_* monitoring views for seven days in cluster, which is fine...
By Steve Jones
I was updating my session for the Data API Builder (DAB) recently, mostly to...
Comments posted to this topic are about the item Parameter Sensitive Plan Optimization vs....
Comments posted to this topic are about the item Hyperscale Replicas I
Comments posted to this topic are about the item The End of Summer
What types of secondary replicas are available for the Azure SQL Database Hyperscale edition?
See possible answers