Recently, I’ve been troubleshooting some network issues, such as connect timeout, read timeout, and packet loss. I wanted to organize some information to share with the team and developers. Let’s first look at the process of receiving data packets in a Linux system: 1. The network card receives the data packet. 2. The data packet […]
Problem Discription Today, I noticed that the CPU usage of a monitored SQL Server database instance was abnormal. There was a significant discrepancy between the system’s CPU utilization (O/S CPU Utilization) and the database instance’s CPU utilization (Instance CPU Utilization). Upon logging into the server for inspection, I found that the Database Mail Engine process […]
Problem Description During SQL Server installation, it prompts that the WMI service cannot start. How to fix SQL Server can’t start the WMI service? 1. Create a new txt file, copy the following code into it: @echo on cd /d c:\temp if not exist %windir%\system32\wbem goto TryInstall cd /d %windir%\system32\wbem net stop winmgmt winmgmt /kill […]
How can we quickly delete data from large tables in SQL Server? Before answering this question, we must clarify the context and specific needs, as different scenarios require different approaches. Scenario 1: Deleting All Data from the Entire Table If the goal is to clear or delete all data from an entire table, this scenario […]
Background When attempting to close the database on a test server using the shutdown immediate command, the process can sometimes take an excessively long time without completing. The situation appears as follows: 1: [oracle@DB-Server admin]$ sqlplus / as sysdba 2: 3: SQL*Plus: Release 10.2.0.4.0 – Production on Thu Nov 21 13:55:13 2013 4: 5: Copyright […]
Background AWS EC2 is AWS’s Elastic Compute Service, providing developers with simple and flexible virtual machines. It is one of AWS’s oldest services (the other being S3) and has been evolving for nearly 17 years since its launch in 2006. Many newcomers to EC2 might have the following similar experiences: There are so many types […]
Why you have connection timeout error in SQL Server? If you encounter this error, it generally means that the client has found the server and can attempt to connect, but the connection time exceeds the allowed duration, causing an error. This situation often occurs when a user runs Enterprise Manager on the Internet to register […]
Why you have login failed for user xxx error when connecting SQL Server? The cause of this error is that SQL Server is using Windows Authentication mode only, so the user cannot connect using SQL Server login accounts (such as sa). How to fix login failed for user xxx issue? The solution is as follows: 1. […]
Why does the “SQL Server does not exist or access denied” error occur? This issue is complex and can arise from various reasons, requiring multiple checks. Generally, the following possibilities exist: 1. Incorrect SQL Server name or IP address. 2. Incorrect network configuration on the server side. 3. Incorrect network configuration on the client side. […]
Unable to connect to an SQL database is a common issue in database operations. It prevents users from accessing the data within the database, causing significant inconvenience. This article will analyze the reasons for being unable to connect to an SQL database from multiple perspectives and provide corresponding solutions. Reasons and Solutions for Unable to […]