Creating Excel in JavaScript

Creating Excel in JavaScript
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In this article, we will create an excel-like application that takes about 30 rows of JS code, with automatic saving to localStorage. No third party libraries are used. To create a formula, you can use “=”. You can also create arbitrary expressions like (=A1+B2*C3) and detect circular references. Read More

Database Checkpoints in SQL Server

Database Checkpoints in SQL Server
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In this article, we will talk about SQL Server Checkpoints.

To enhance performance, SQL Server applies modifications to database pages in memory. Often, this memory is called the buffer cache or buffer pool. SQL Server does not flush these pages to disk after every change. Instead, the database engine does checkpoint operation on each database from time to time. The  CHECKPOINT operation writes the dirty pages (current in-memory modified pages) and also writes details about the transaction log. Read More

SQL Server Unit Testing with tSQLt Framework

SQL Server Unit Testing with tSQLt Framework
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In this article, we will talk about the tSQLt framework — a free database unit testing framework for Microsoft SQL Server. You can use tSQLt to create unit tests for SQL Server 2005 (service pack 2 required) and all further versions. The main convenience is that you do not need to switch between various tools to create code and unit tests. Read More

Dive Into SQL Server Transaction Log — Part 3

Dive Into SQL Server Transaction Log — Part 3
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This is the third article in a series of articles about SQL Server transaction log. In this article, we will have a look at log record details.

Log Records

Log records are the core of the logging and recovery mechanisms. A log record describes a single change in a database. Thus, every change to a database has a log record or log records that help to describe that particular change.  Although you do not need to understand log record details, to understand what is going on with logging and recovery, those details are extremely interesting. Read More