Tag: DBA

SQL Server Performance Office Hours Episode 16

Posted on by Erik Darling

SQL Server Performance Office Hours Episode 16


To ask your questions, head over here.

I’ve heard you talk about your career path a few times, and it’s pretty weird. Do you have any regrets? Are you still happy with what you do?
Do you have differing approaches for performance tuning an OLAP system vs an OLTP system?
Do you know of any disadvantages of using a filtered index to filter NULL values? We have a very heavy transactional table, like 10k trans/sec, with a clustered index and one non-clustered index. We don’t have any queries that select rows with NULL values ​​from this table. The DBA team said we should avoid using a filtered index without any proof. What do you think?
In all your demos you compress (page) your indexes. Do you default to that with your all your client workloads? Do you see more benefit than a negative impact in your experience? Thanks!
I’ve seen you suggest columnstore for paging and dynamic searches. How do you make your non-clustered columnstore indexes perform acceptably on tables where all of the data is hot?

Going Further

If this is the kind of SQL Server stuff you love learning about, you’ll love my training. I’m offering a 75% discount to my blog readers if you click from here. I’m also available for consulting if you just don’t have time for that, and need to solve database performance problems quickly. You can also get a quick, low cost health check with no phone time required.

Learn T-SQL With Erik: A Neat GROUP BY Trick

Posted on by Erik Darling

Learn T-SQL With Erik: A Neat GROUP BY Trick

Going Further

If this is the kind of SQL Server stuff you love learning about, you’ll love my training. I’m offering a 75% discount to my blog readers if you click from here. I’m also available for consulting if you just don’t have time for that, and need to solve database performance problems quickly. You can also get a quick, low cost health check with no phone time required.

Learn T-SQL With Erik: Stupid OUTPUT Stuff

Posted on by Erik Darling

Learn T-SQL With Erik: Stupid OUTPUT Stuff

Going Further

If this is the kind of SQL Server stuff you love learning about, you’ll love my training. I’m offering a 75% discount to my blog readers if you click from here. I’m also available for consulting if you just don’t have time for that, and need to solve database performance problems quickly. You can also get a quick, low cost health check with no phone time required.

Learn T-SQL With Erik: DISTINCT Isn’t Always Evil

Posted on by Erik Darling

Learn T-SQL With Erik: DISTINCT Isn’t Always Evil

Going Further

If this is the kind of SQL Server stuff you love learning about, you’ll love my training. I’m offering a 75% discount to my blog readers if you click from here. I’m also available for consulting if you just don’t have time for that, and need to solve database performance problems quickly. You can also get a quick, low cost health check with no phone time required.

Learn T-SQL With Erik: Solving Problems With APPLY

Posted on by Erik Darling

Learn T-SQL With Erik: Solving Problems With APPLY

Going Further

If this is the kind of SQL Server stuff you love learning about, you’ll love my training. I’m offering a 75% discount to my blog readers if you click from here. I’m also available for consulting if you just don’t have time for that, and need to solve database performance problems quickly. You can also get a quick, low cost health check with no phone time required.

SQL Server Performance Office Hours Episode 13

Posted on by Erik Darling

SQL Server Performance Office Hours Episode 13

What is the effect of having a few queries using Read Committed isolation level where the database is set to RCSI? Will those dumb Read Committed queries block any others?
Do you have any suggestions for optimizing data retrieval using Full Text Search (FullTextMatch TVF)? We’ve tried cutting down the query to reduce the dataset using other parameters before the FTS bit and also breaking out FTS across multiple columns to do one at a time, but anything else? Also, the memory used by FullTextMatch is hard to define. Should we reduce the size of the BufferPool to give more to FTS or the other way around? Thank you for coming to my Ted Talk on FTS.
If I were to want to kill all the table partitions by fire, what brand of flamethrower do you recommend?
Do you know of any documentation that makes it very obvious what Max Server Memory controls? It’s changed across versions. I think it used to just be the buffer pool?
I am writing C# classes and building CLRs for string comparisons, then creating a TVF for execution. The TVF is creating row estimates of exactly 1000x my row actuals (2 rows creates a “2 of 2000” for example). No query hints seem to resolve this, how would you work to control these estimates from my compiled C#?

To ask your questions, head over here.

Going Further

If this is the kind of SQL Server stuff you love learning about, you’ll love my training. I’m offering a 75% discount to my blog readers if you click from here. I’m also available for consulting if you just don’t have time for that, and need to solve database performance problems quickly. You can also get a quick, low cost health check with no phone time required.

Learn T-SQL With Erik: INNER vs OUTER JOIN Filtering Logic

Posted on by Erik Darling

Learn T-SQL With Erik: INNER vs OUTER JOIN Filtering Logic

Going Further

If this is the kind of SQL Server stuff you love learning about, you’ll love my training. I’m offering a 75% discount to my blog readers if you click from here. I’m also available for consulting if you just don’t have time for that, and need to solve database performance problems quickly. You can also get a quick, low cost health check with no phone time required.

Learn T-SQL With Erik: WHERE vs Having

Posted on by Erik Darling

Learn T-SQL With Erik: WHERE vs Having

Going Further

If this is the kind of SQL Server stuff you love learning about, you’ll love my training. I’m offering a 75% discount to my blog readers if you click from here. I’m also available for consulting if you just don’t have time for that, and need to solve database performance problems quickly. You can also get a quick, low cost health check with no phone time required.

Learn T-SQL With Erik: SELECT FROM WHERE?

Posted on by Erik Darling

Learn T-SQL With Erik: SELECT FROM WHERE?

Going Further

If this is the kind of SQL Server stuff you love learning about, you’ll love my training. I’m offering a 75% discount to my blog readers if you click from here. I’m also available for consulting if you just don’t have time for that, and need to solve database performance problems quickly. You can also get a quick, low cost health check with no phone time required.

Learn T-SQL With Erik: Course Introduction Material

Posted on by Erik Darling

Learn T-SQL With Erik: Course Introduction Material

Going Further

If this is the kind of SQL Server stuff you love learning about, you’ll love my training. I’m offering a 75% discount to my blog readers if you click from here. I’m also available for consulting if you just don’t have time for that, and need to solve database performance problems quickly. You can also get a quick, low cost health check with no phone time required.