Are you a professional willing to start your career as a SQL Server DBA? Then you are at the right place. DBA is a person who is responsible to maintain the security and integrity of the database and restricts unauthorized users. DBA also grants permission to the database users. This tutorial will help you to learn about SQL Server, uses of SQL Server, its architecture, and many other things. Learning all these things will enhance your skills related to SQL server. So let's get started.
SQL Server is a relational database management system that Microsoft has developed. It is mainly designed and built to compete with the Oracle and MySQL database. SQL server is primarily used for storing and retrieving data. SQL Server's key interface tool is SQL Server Management Studio, which runs on both 64-bit and 32-bit environments.
In order to understand SQL Server completely, first, we need to learn the SQL language. SQL is the query processing language used to process data into relational databases. In the client server model, the database server is a program which offers multiple services. Accordingly, we have referred to a SQL server as a database server that uses SQL as a query language.
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The key usage for MS SQL Server is as follows:
SQL Server is a client-server based architecture and is aimed at end-users called clients who send queries to the MS SQL server that is installed on a specific computer. Once the processing input data is requested, the server will deliver the expected result. This server is vacant as a separate program and is in charge of managing any statements, instructions, or commands in the database.SQL server database engine will control data processing, storage, and security. So, it is the main component of the SQL server.
SQL Server looks very simple, but internally in the background, many processes run to respond to the requests. According to the architecture, the SQL Server primarily has three main components: Network Protocols, SQL OS, and database engine.
SQL OS: It is used for the first time in SQL 2005. In the past, this was only intended for small and medium-sized applications. Microsoft is upgrading SQL Server into SQL 2005 to fit the load of high-end enterprise databases. This is a layer that is located between the Windows OS and the database engine. Numerous OS services are managed by SQLOS, that includes I/O and memory management, threading, scheduling, synchronization, and exception handling.
[Related article: Exception Handling in SQL Server]
Database Engine: This is what the SQL Server architecture is all about. This is the second layer in the architecture which provides connectivity among user connections using the network protocol and the SQL server OS to actually execute. It demonstrates the logical architectures of the database objects like views, tables, triggers, and stored procedures that work with relation engine and physical architecture to meet customer requests. The database engine is made up of two components:
Storage Engine: It displays physical database architecture along with data storage and retrieval from buffer manager and storage system.
Relational engine: This is responsible for the evaluation of user requests and carries out the execution. It decides what is the most effective way to execute a query. This is also known as the Query Processor. The main tasks performed by relational engines are memory management, Query processing, distributed query processing, buffer management, and thread and task management.
Network Protocol: It is completely responsible for the client connectivity of the SQL Server database engine. In addition, it has another protocol called VIA. The VIA is the hardware protocol which has become obsolete by Microsoft. In the most recent SQL Server Configuration Manager, this protocol will not be seen.
MS SQL Server includes Business Intelligence (BI) and Data Management tools and services. SQL Server consists of the following tools and services for managing data:
[Related Article: SQL Server Data Tools]
SQL Server Instances
SQL Server installation is an instance. A number of instances can be installed on a specific machine, but the default will be only one. It is the accurate copy of databases, server files, and security credentials.
Top 20+ frequently asked SQL Server interview questions & answers for freshers & experienced professionals
The SQL Server instance has the following benefits:
In this tutorial, we have covered all the basics related to SQL Server like SQL Server usage, architecture, and SQL Server Instances. We hope you found this tutorial helpful. If you find any topic to be included in this tutorial do not forget to comment below.
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