Error: Failed to download metadata for repo 'AppStream'

The error is due to CentOS is already EOL and you need to update your repo so it points to the archived repo. You can do this by using the following sed command.

cd /etc/yum.repos.d/ sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-* sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*

Once done, you should be able to do your yum update or dnf update.

ldapsearch password file with no newline

ldapsearch allow you to specify password file with option -y. However, there is one condition for this password file is it cannot contain newline. To make sure you create a password file without newline, use echo -n where -n allow you to output without trailing newline. Example:

echo -n 'password' > .passFile

How to Print Affected Row(s) for job run using SQL Server Agent

 To do this, you need to do the following:

DECLARE @AffectedRows AS INT

UPDATE testdb set col1 = 1 where col2 = '2'

SET @AffectedRows = @@ROWCOUNT 

PRINT 'Row(s) affected ' + CAST(@AffectedRows AS VARCHAR)

Which will write the following in your defined log file when your SQL Server Agent job is running.

Job 'TestJob' : Step 1, 'Update Test' : Began Executing 2022-06-03 16:21:16

Row(s) affected 6 [SQLSTATE 01000]

Do note that you cannot just do PRINT @@ROWCOUNT as PRINT will reset @ROWCOUNT value to 0. Therefore you need to assign @@ROWCOUNT to a variable first before you PRINT.

Excel Slow Performance - Calculating (8 Threads)

If you experience slowness while working on your Excel workbook and you can see the calculating message appear at the bottom right of your Excel workbook. It could be due to you are using formula such as COUNTIF and your argument is to scan all the rows (e.g. A:A).

If your data do not occupy all the rows, then make it more explicit so that it scan only rows with data. If doing this is troublesome, you can just scope it such as it is big enough (e.g.A1:A800) to cover your case. Once this is done, you should not experience slowness as the scanning can be done faster.