This article gives an overview of Automatic Page Repair in SQL Server Always On Availability Groups. SQL Server Always On is a disaster and high availability feature. In the previous articles, we explored the following features.
SQL Server Always On is a disaster and high availability feature. In the previous articles, we explored the following features.
In the above points, we safeguard SQL Server for the instance and DB failover. Suppose your AG replica is healthy, but one of your AG databases becomes corrupt. You get a logical consistency error if you execute the DBCC CHECKDB command. You might have an excellent copy of that database page in another participating replica. Let’s find the answer to a few questions in this article.
You can follow the series articles and prepare a two-node SQL Server Always On Availability Group, as shown below.
SQL Server supports automatic page repair for the databases participating in AG configuration. If SQL detects specific corruption errors (Error id 823,824 & 829) for an AG database, SQL Server tries to restore the page from the corresponding replica(primary or secondary).
It works for the following consistency errors.
Let us consider that my AG database is in the synchronized state and communicating with the secondary replica. Now, you get the IO error in an AG database on the primary replica. The below diagram shows the high-level steps for the automatic page repair if any page corrupts at the primary replica.
Let’s simulate the automatic page repair in the SQL Server Always On Availability Group
SQL stands for Structured Query Language. SQL is a scripting language expected to store, control, and inquiry information put away in social databases. The main manifestation of SQL showed up in 1974, when a gathering in IBM built up the principal model of a social database. The primary business social database was discharged by Relational Software later turning out to be Oracle.
This article gives an overview of SQL Server Always On Availability Group features. We configured the SQL Server Always On Availability Group from the beginning of building virtual machines.
SQL GROUP BY clause in SQL is used to arrange the same data into groups with the help of some functions. SQL GROUP BY is also used with aggregate functions.
This article will provide a review on how to configure Always On Availability groups in AWS EC2 instances and AWS FSx as file share witness.
Debug SQL stored procedures and develop your SQL database project with dbForge SQL Complete, a new add-in for Visual Studio and SSMS. When you develop large chunks of T-SQL code with the help of the SQL Server Management Studio tool, it is essential to test the “Live” behavior of your code by making sure that each small piece of code works fine and being able to allocate any error message that may cause a failure within that code.