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MySQL is a relational database, meaning data is stored in tables. Each table has a set of columns, and each column has a specific data type.
In MySQL, you can use the CREATE EVENT statement to schedule events. Events can be tasks or queries the database will execute based on a schedule. To create a weekly scheduled event, follow these steps: If it’s OFF, you can turn it on using: Note: Remember to ensure it’s enabled […]
In MySQL, a “thread” represents a single connection to the MySQL server from a client. When you observe the threads’ states, “Sleep” is one of the possible states a thread can be in. Sleep Threads in MySQL Threads in the “Sleep” state will be listed with “Sleep” in the “Command” […]
The SHOW STATUS command in MySQL provides information about system status variables. These variables present a snapshot of the server’s operations and performance at any moment. Due to the extensive number of status variables, discussing each one would be exhaustive. I’ll provide an overview of some key variables and their […]
Each client that communicates with a MySQL server establishes a separate connection. Monitoring and analyzing these connections is crucial for database performance tuning, capacity planning, and ensuring the server isn’t overwhelmed with too many connections. How to Monitor Connection Count in MySQL: Analyzing the Connection Count: This command will show […]
The error “Failed getting connection; pool exhausted” usually occurs when using database connection pools. A connection pool is a cache of database connections maintained so that the connections can be reused rather than opened and closed repeatedly. Let’s go through the possible causes of this error and how you can […]
In SQL, the UPDATE statement is used to modify the existing records in a table. Often, this statement is combined with SELECT statements or subqueries to update documents based on dynamic or complex conditions. Let’s delve into how UPDATE clauses can incorporate SELECT statements or subqueries with examples: Updating with […]
Using JSON format in MySQL involves utilizing JSON data type columns and JSON functions that MySQL provides. Here’s how you can work with JSON data in MySQL: Step 1: Creating a Table with JSON Data Type You can create a table with a JSON data type column to store JSON […]
The error you’re encountering, “Error Code: 1093. You can’t specify target table ‘tableName’ for an update in FROM clause”, occurs when you try to update a table based on a subquery referencing the same table. MySQL doesn’t allow updates to a table when the table is also being used in […]
The ON DUPLICATE KEY UPDATE a clause in MySQL updates the existing record if a duplicate critical violation occurs when inserting a new record. This is particularly useful when you want to insert a new record. Still, if a form with the same key already exists, you want to update […]
You run an e-commerce platform and want to monitor the inventory levels of your products. You’d like to receive an alert when a product’s inventory drops below a certain threshold, indicating it’s time to restock. Steps to Set Up the Alert System: Step Action Details 1 Setup and Integration – […]