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
3 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
8 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
4 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
9 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
2 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
3 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
22 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
15 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
25 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
10 reads
Blogs
My 2024 in Data: Music
By Steve Jones
This is my last week of the year working (I guess I come back...
A New Word: Suente
By Steve Jones
suente– n. the state of being so familiar with someone that you can be...
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Timeout Error while executing a TSQL statement in Sql server Express Edition
I am getting the below error when I execute a SQL command in SQL...
Timeout Error while executing a TSQL statement in Sql server Express Edition
I am getting the below error when I execute a SQL command in SQL...
Sql script replace and rearrange numbers
Hi everyone. I have this table and this information. (left side of the image)...