Filtered Statistics in SQL Server
In SQL Server, Filtered Statistics can improve cardinality estimation, i.e. when joining lookup table, or while joining fact table and dimension table. For this reason, SQL Server supports the...
2016-05-15
10 reads
Ramesh Meyyappan’s SQL Server Performance Tuning Blog
Parallel Insert Into – Table Variable Vs Temporary Table in SQL Server
In SQL Server, for insert into select statements, when the target for insert into is temporary table, the select statement can execute in parallel. When the target is table...
2016-05-15
16 reads
Cardinality Estimation – Table Variable Vs Temporary Table in SQL Serve
SQL Server creates and maintains statistics for temporary tables, which lead to better cardinality estimation and optimal execution plan generation. Table variables have no statistics, which can result in...
2016-05-15
10 reads
Understanding ASYNC_NETWORK_IO Waits in SQL Server
In SQL Server, ASYNC_NETWORK_IO wait time can be high due to slow network, like when the database is in the cloud and the application is on premise. Furthermore, it...
2016-05-15
24 reads
Resource Governor in SQL Server – Workload Throttling
Resource Governor in SQL Server provides CPU, Memory and I/O throttling. In SQL Server 2014 and earlier, CPU throttling works only for similar kind of workloads and not for...
2016-05-14
9 reads
Data Compression in SQL Server – Pros and Cons
SQL Server supports row and page compression on tables, indexes and partitions. This can lead to reduced I/O and better performance. However, it can also result in additional CPU...
2016-05-10
17 reads
SQL Server Command Timeout – Application Timeout – Attention
When you use ODBC or SqlClient to access data from SQL Server, by default the query will be cancelled if there is no response from the server within a...
2016-05-09
29 reads
Slow performance due to SQL Server 2014 Buffer Pool Extension (BPE) and serial queries (MAXDOP 1)
The SQL Server 2014 Buffer Pool Extension feature can extend the buffer pool space on to Solid State Drive (SSD), where data and index pages can be cached. There...
2014-12-04
23 reads
NUMA remote (foreign) memory access overhead on Windows, SQL Server and In-Memory OLTP
In NUMA (Non-Uniform Memory Access), processors in the same physical location are grouped in a node which has its own local node memory. In a NUMA based system, there...
2014-12-04
37 reads
SQL Server 2012: Indirect Checkpoint (Target Recovery Time), get the real scoop
SQL Server 2012 brings a new feature called Indirect Checkpoint. You can read more about it here: http://msdn.microsoft.com/en-us/library/ms189573.aspx. With Indirect Checkpoint, you get smaller and too many I/Os Checkpoint...
2013-03-19
14 reads
Blogs
PowerPoint to HTML with Claude AI
By Steve Jones
I had an idea for an animated view of a sales tool, and started...
Don’t Miss Out – SQL Server Query Tuning Fundamentals Starts Next Monday!
Next Monday, February 9, 2026, my one-day live online training SQL Server Query Tuning...
Monday Monitor Tips: SQL Auditing Preview
By Steve Jones
One of the features we advocates have been advocating for is a better way...
Forums
Level 28: DAX Text Functions: The DAX Extract & Modify Functions: LEFT(), RIGHT(), MID(), REPLACE(), SUBSTITUTE()
Comments posted to this topic are about the item Level 28: DAX Text Functions:...
Creating JSON I
Comments posted to this topic are about the item Creating JSON I
Expensive CPUs
Comments posted to this topic are about the item Expensive CPUs
Question of the Day
Creating JSON I
On SQL Server 2025, what happens when I run this code:
SELECT JSON_OBJECTAGG( 'City':'Denver') GOSee possible answers