Here’s a few guidelines to get started. Indexes should almost always be built on columns used as primary keys, foreign keys, or frequently used in query join and where clauses. Tables with frequent updates should have very carefully chosen indexes, since each additional index will dramatically reduce write speeds to the table. Very large and... » read more
Instead of being a SQL Server capability, though,RAID is a feature of the hardware that powers the server. RAID stands for Redundant Array of Independent Disks, and it’s configured by the operating system. RAID arrays use multiple physical hard drives, provide increased disk read and write speeds, more data redundancy protection, or both. RAID 5... » read more
SQL Server Log shipping allows you to automatically send transaction log backups from a primary database on a primary server instance to one or more secondary databases on separate secondary server instances. The transaction log backups are applied to each of the secondary databases individually. An optional third server instance, known as the monitor server, records the history and status of backup and... » read more
Replication is a set of technologies for copying and distributing data and database objects from one database to another, and then synchronizing between those databases to help maintain consistency of the data. Using replication, you can distribute data to different locations and even to remote or mobile users over local and wide area networks, dial-up... » read more
In a nutshell, the three main steps involved in moving a database file to new location are: Set database to single user mode. Detach the database. Move database file to new location. Reattach the database by referencing the new location of the database file. Set database to multiple user mode. Note: There are 2 ways to... » read more
Copy–only backups are independent backup files that do not disrupt the regular Log Sequence Number (LSN) routine. This means that backup chains and restore sequences won’t be affected by the copy–only backup. A copy-only backup is a SQL Server backup that is independent of the sequence of conventional SQL Server backups. Usually, taking a backup changes the database and affects how later backups... » read more
At a minimum, every SQL Server database has two operating system files: a data file and a log file. Data files contain data and objects such as tables, indexes, stored procedures, and views. Log files contain the information that is required to recover all transactions in the database. Data files can be grouped together in... » read more
Highly recommend that you store all user databases, user database logs, and backups on a drive separate from the system drive. So in other words, if your SQL Server is installed on the C drive of a computer, you should be putting all of your data files on a separate drive, and the reason being... » read more
By default the database engine uses what’s known as an auto commit. Every T-SQL statement is committed or rolled back when it completes. The database engine will always use this auto commit functionality unless a transaction is explicitly specified with BEGIN TRAN. Implicit transaction are rarely used in SQL server and when the option is... » read more
Similar to Read Committed Isolation level but you can still read the old version of the data. Before a row is locked in preparation for changes, that means an update statement that might be run to a given row, that row is then placed in a version store (TempDB). The big advantage that our SCI... » read more