Table Structures in SQL Server
Heaps vs Clustered Indexes and how tables are structured and data is stored in SQL Server. Data rows from a table are stored in the data pages in either an unsorted order (Heap) or a sort order (Clustered Index).
Deardurff
Concurrency: Phantom Reads
A closer look at the Serializable Transaction Isolation Level and how it could prevent Phantom Reads concurrency issues in SQL Server.
Concurrency: Inconsistent Analysis
A closer look at the Repeatable Read Transaction Isolation Level and how it could help with Inconsistent Analysis concurrency issues in SQL Server.
Concurrency: Lost Updates
A closer look at the Read Committed Transaction Isolation Level and how it could allow Lost Update concurrency issues in SQL Server.
Concurrency: Dirty Reads
A closer look at the Read Uncommitted Transaction Isolation Level and how it could allow Dirty Reads in SQL Server.
What are Locks?
What is a Lock? What is the process that transactions use to lock records to provide transaction isolation.
Transaction Isolation Levels
Transaction Isolation Levels are used to control data access concurrency. Concurrency controls can be Pessimistic or Optimistic.
What are Transactions?
The ACID properties of SQL Transactions, What are the different ACID properties of a transaction how they ensure that data is Atomic, Consistent, Isolated, and Durable.
Restore and Recovery
The restoration process of a SQL Server database passes through two phases: Restore and Recovery.
SQL Statement Categories
There are four main categories of statements used when writing T-SQL. What are the differences between each of these categories?