Querying on Andy M Mallon - AM²

Is SQL Server affected by OpenSSL 3.0 Vulnerabilities: CVE 2022-3786 and CVE 2022-3602

Tue, 08 Nov 2022 03:30:24 -0500

Question

I am trying to establish whether SQL Server is affected by the recently discovered OpenSSL vulnerabilities. For example, are SQL Servers that are using TLS/Certificates to encrypt connections between client and server affected to? I believe SQL Server uses Open SSL libraries for encryption purposes. Can someone please shed light on this?

SQL Main query value used in the WHERE in the subquery

Wed, 09 Mar 2022 16:02:11 -0500

Question

I'm really confused by this SQL here, I have this sample where I am using the value from the main query in the subquery and then using XML PATH to add a comma between the dates. The setup is 2 tables one with the dates I want to string together. I am not sure why the subquery where statement is not retuning the correct results.

How to await the execution of the rds_backup_database stored procedure?

Thu, 03 Mar 2022 13:40:49 -0500

Question

Our team is migrating one of our databases to Amazon RDS MS SQL Server. As part of that, we have to rewrite some of our stored procedures.

We have a stored procedure that performs a database backup to a network storage.

Add default rows to the query result if restrictions are not met

Thu, 10 Feb 2022 13:12:49 -0500

Question

I have a SQL query that looks for values in a table on a range of dates.

If no record is found, I would like to generate rows with default values.

Example of one of the table existing records:

Querying SERVERPROPERTY() and DATABASEPROPERTYEX() from a view (without knowing magic)

Fri, 17 Dec 2021 11:11:50 -0500

Elphaba the pup is growing up! I'm not going to beat around the bush. I hate the `SERVERPROPERTY()` and `DATABASEPROPERTYEX()` system functions.

Loathing

The thing I hate the most about these two functions is that you need to know the right magic spells to make them work. Let’s look at SERVERPROPERTY() first. The syntax for the function is SERVERPROPERTY( ‘propertyname’ ), which is easy enough syntax, but the list of values for propertyname isn’t discoverable from SQL Server metadata, DMVs, or even IntelliSense. Instead, I need to check the docs for the list of allowable values. These property names are essentially magic words, and I need to check my spell book to make sure I get it right.

How do I put the result of stored procedure in a new column in a view?

Sun, 17 Oct 2021 06:10:18 -0400

Question

I have created a stored procedure which takes as inputs a schema name and a table name and outputs an INT containing the largest value in the id column of the table. I have also created a view containing all the schema names, table names, and primary key column names in my database. I would like to add a column to this view containing the result of my stored procedure, using the schema name and table name values as inputs to the row’s stored procedure. I have tried a few different things, but I can’t find a way to do it.

An expression of non-boolean type specified in a context where a condition is expected, near 'AND'

Tue, 08 Jun 2021 18:45:31 -0400

Question

ALTER PROCEDURE [dbo].[usp_BaseScan_CycleCount_Report]
@StartDate varchar(10),
@EndDate varchar(10)

AS

BEGIN

 IF @StartDate AND @EndDate IS NOT NULL
 SELECT * 
 FROM dbo.CycleCountHistory
 WHERE RecordDate BETWEEN @StartDate AND @EndDate
 
 ELSE 
 SELECT *
 FROM dbo.CycleCountHistory
END

Error message: Msg 4145, Level 15, State 1, Procedure usp_BaseScan_CycleCount_Report, Line 16 An expression of non-boolean type specified in a context where a condition is expected, near 'AND'. Msg 156, Level 15, State 1, Procedure usp_BaseScan_CycleCount_Report, Line 21 Incorrect syntax near the keyword 'ELSE'.

View SQL Code Behind Flat File Import Wizard?

Mon, 10 May 2021 17:58:41 -0400

Question

Is there a way to view and copy the code that the "Import Flat File to SQL" Wizard ultimately uses, after I have gone through all the steps (chosen file, set up data types for my columns, etc.)?

While using the Import Flat File to SQL wizard, I found it cumbersome to have to select a data type for each column individually. My data had a large amount of columns to change. In the future, I would prefer doing this via SQL code to save time. I'm learning Microsoft SQL Server Studio and currently only know how to use the Import Flat File Wizard, so I would need to learn all the steps for doing it another way.

Why is part of transaction committed when stored procedure faults?

Sun, 25 Apr 2021 23:31:33 -0400

Question

I have a stored procedure that begins by declaring a few variables then contains begin tran; After this it performs some validations on the supplied arguments (and increments an error count each time a supplied argument fails validation). If there is no error count it then proceeds to carry out 7 inserts. Following this, it has commit tran;

Job management: How to get the next running date by querying MSDB

Fri, 27 Nov 2020 10:10:17 -0500

Question

Table sysjobschedules contains 2 columns next_run_date and next_run_time. With the help of sysschedules and column enable it should be easy to determine the next running date/time of a specific job.

However, when you change a schedule, sysjobschedules is only refreshed 20 minutes after alteration by the Sql Server Agent.

Recursive CTE in SQL Server to count blocking sessions

Mon, 18 May 2020 19:54:25 -0400

Question

I’m trying to make CTE to count blocking sessions on server. Currently I made a function to do so(returns blocking session amount). But still could not write this query with CTE.

 CREATE FUNCTION dbo.SESSIONS(@SESSION int)
 RETURNS INT
 AS 
 BEGIN
 DECLARE @returnValue int =0
 SET @returnValue = @returnValue + (			
 			SELECT isNULL((
 			SELECT (SELECT COUNT(session_id) FROM sys.dm_exec_requests R2 WHERE blocking_session_id =R1.blocking_session_id) AS [BLOCKING]
 			FROM sys.dm_exec_requests r1 
 WHERE blocking_session_id = R3.session_id
 			GROUP BY blocking_session_id), 0)
 			FROM sys.dm_exec_sessions R3 where session_id=@SESSION)
 
 	DECLARE @s int = (SELECT MAX(session_id) FROM sys.dm_exec_requests
 			 WHERE blocking_session_id = @SESSION)

 	IF @s IS NOT NULL
 	BEGIN
 		SET @returnValue = @returnValue + dbo.SESSIONS(@s)
 	END
 
 	RETURN @returnValue
 END

Asked2022-05-18bymortu

Making non-SARGable queries seek, without changing the query

Wed, 06 May 2020 08:36:27 -0400

We’ve all been there. You’ve got a query where the JOIN or WHERE predicate is not SARGable. You’ve read about how this can be a problem, and how bad it is for performance.

Alas, you cannot change the query. Sometimes this reason is political, sometimes it’s because you’ve got a third-party app and simply don’t have access to the code. But you do have access to the database…

Is it possible to re-use a query plan from the plan cache from one database in another database?

Fri, 01 Nov 2019 18:08:43 -0400

Question

For example, if I hit the sys dynamic views to select a specific query plan, am I able to insert that query plan into another database's plan cache, that runs the same exact query? (I know the query is hashed and compared to determine when to generate a new plan, so in my example I would ensure the query truly is exactly the same character by character.)

How To Fix High DTU Usage on Specific Query

Thu, 10 Oct 2019 18:03:01 -0400

Question

I have a query that runs every few seconds on a Microsoft SQL Azure Database. It is from a web job that checks if there are actions that need to be done based on rows in a specific table (its a queueing table). Based on the image attached, does anyone have any suggestion of how i could reduce the DTU usage for the query in question, it is causing the database to reach 100% CPU.

Performance Myths: The query result cache

Mon, 23 Jul 2018 10:48:11 -0400

I was recently doing a training session when a developer commented that it was OK to run an expensive query twice because on the second execution, SQL Server would use the “results cache” and be “practically free”. It’s not the first time I’ve heard someone refer to a “results cache” in SQL Server. This is one of those myths that is almost true, which makes it that much more believable. If you don’t know better, you might think SQL Server has a “results cache” because the second execution of a query is often faster.

Deadlock when creating a database - A Query Store bug

Tue, 20 Mar 2018 09:00:17 -0400

Earlier tonight, I sat down to install Reporting Services on my laptop. I haven’t played with SSRS 2017 yet, so I figured I’d poke around some. Much to my surprise, the configuration failed when creating the ReportServer database, reporting a deadlock. When I looked at the database instance, I found the ReportServer database there, but with no objects it in, and the ReportServerTempDB database missing.

Interviewed by Mohammad Darab

Wed, 20 Dec 2017 10:01:42 -0500

As part of Mohammad’s series of interviews, he interviewed me on my thoughts on the future of SQL Server, the DBA role, and the cloud.

Read the interview on Mohammad’s site.

Query a view in a procedure in which the view name is a variable

Wed, 16 Aug 2017 18:18:49 -0400

Question

My problem: I have a set of views from which I want to query dynamically. I want to load the view names by SELECT * from sys.all_views into a cursor (let's call it view_cursor) and then do something like this in a procedure:

Reconnect "not connected" query windows in SSMS to original connection

Mon, 14 Aug 2017 14:20:38 -0400

Question

Is there a simple way to reconnect a query window that is “not connected” to the original connection that was used by that query without manually picking the server name needed? If I click the Connect button on the SQL Editor toolbar or right click -> Connection -> Connect… it defaults the server name to the last connection I used in that SSMS session, not to the last connection used by that specific query window.

Why does it take so long to view logs on a server?

Thu, 20 Apr 2017 12:20:14 -0400

Question

I am just trying to look up more verbose information for a maintenance plan task that failed. I open up the log file viewer and check the box to view the logs for my maintenance plan. There are no active filters besides that in this example. Then I play the waiting game.....

Keyboard shortcut to close a query tab in SSMS

Fri, 27 Jan 2017 08:00:22 -0500

Shortcuts & tips from an Impatient DBA

This series of short posts will demonstrate some lesser-known features, keyboard shortcuts, and other tips that make my day as a DBA more productive. None of these are groundbreaking super-secret features–they are the little things that I do as part of my daily work that make me more efficient.

What's the deal with transactions in a stored procedure called by an SSRS report?

Tue, 01 Mar 2016 23:00:41 -0500

Question

Consider the following:

CREATE PROCEDURE dbo.usp_trantest AS
SELECT @@TRANCOUNT as trancount;
GO

When I call usp_trantest manually from within SSMS, the trancount is 0. If I run an SSRS report that contains a dataset that queries the same stored procedure, the trancount is logged as 1.

SSMS Query Shortcuts

Thu, 28 May 2015 13:30:00 -0400

Querying on Andy M Mallon - AM²

Is SQL Server affected by OpenSSL 3.0 Vulnerabilities: CVE 2022-3786 and CVE 2022-3602

Question

SQL Main query value used in the WHERE in the subquery

Question

How to await the execution of the rds_backup_database stored procedure?

Question

Add default rows to the query result if restrictions are not met

Question

Querying SERVERPROPERTY() and DATABASEPROPERTYEX() from a view (without knowing magic)

Loathing

How do I put the result of stored procedure in a new column in a view?

Question

An expression of non-boolean type specified in a context where a condition is expected, near 'AND'

Question

View SQL Code Behind Flat File Import Wizard?

Question

Why is part of transaction committed when stored procedure faults?

Question

Job management: How to get the next running date by querying MSDB

Question

Recursive CTE in SQL Server to count blocking sessions

Question

Making non-SARGable queries seek, without changing the query

Is it possible to re-use a query plan from the plan cache from one database in another database?

Question

How To Fix High DTU Usage on Specific Query

Question

Performance Myths: The query result cache

Deadlock when creating a database - A Query Store bug

Interviewed by Mohammad Darab

Query a view in a procedure in which the view name is a variable

Question

Reconnect "not connected" query windows in SSMS to original connection

Question

Why does it take so long to view logs on a server?

Question

Keyboard shortcut to close a query tab in SSMS

Shortcuts & tips from an Impatient DBA

What's the deal with transactions in a stored procedure called by an SSRS report?

Question

SSMS Query Shortcuts

Shortcuts & tips from an Impatient DBA #4