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Importance Of Data Recovery In DBMS



Multiple transactions are carried out on the DBMS every second, making it a very complex system. Besides the secure and complex architecture of a system, the strength depends on the management and maintenance of data when the worst happens. There have to be some methods and procedures by which the lost data during a transaction if the underlying architecture fails or crashes.

What is meant by Data Recovery?

A data recovery process involves restoring corrupted, lost, accidentally deleted, or inaccessible data. Generally, it consists of recovering data from internal or external storage media such as USB drives, hard disk drives (HDD), CDs, DVDs, floppy disks, memory cards, solid-state drives (SSD), magnetic tapes, and other data storage devices.

Companies rely on data recovery services to restore backups to laptops, desktops, external storage systems, and servers. Recovery services allow users to recover files that have been deleted accidentally and have no backup but are still present on the hard drive as fragments.

What is the Need for Recovery of data?

As data storage technologies advance, four types of media with increasing reliability are used: the main memory, the magnetic disk, the magnetic tape, and the optical disk. Database processing and transactions can be affected by many failures, and each must be addressed differently.

In some cases, data failures affect only the main memory. In other cases, non-volatile or secondary storage is also affected. The most common sources of failure include:

  • When hardware or software errors cause the system to crash, the main memory is lost.
  • In the event of media failures, such as head crashes or unreadable media, portions of secondary storage may be lost.
  • One or more transactions may fail or abort due to errors in application software, such as logical errors when accessing a database.
  • A natural physical disaster may also occur, such as a fire, flood, earthquake, or power outage.
  • Operators or users who have been negligent or unintentionally destroyed data or directories.
  • The deliberate act of damaging or corrupting data (using malicious computer programs or files) or software facilities.

Importance Of Data Recovery In DBMS

System crash

These types of failures mostly happen during the transaction execution process. This category includes hardware, software, and network errors. Hardware failures are generally classified as hardware failures.

Keeping data secure

The importance of data to any business organization cannot be overstated. The more users access the information, the greater the risk of a data breach. Business losses would be significant if someone stole business data.

Therefore, a company will never want an outsider to access its data. The company spends a lot of time, effort, and money to ensure that only authorized users can access its data.

Your precious data is protected from unauthorized access with DBMS data security. Authorized users of the organization can only access data. Databases are accessible only via proper authentication, usually verifying the login and password.

System error

Some operation performed during the transaction causes this type of error, such as integer or divide by zero. A failure of this type is also known as the transaction, which may occur due to erroneous parameter values or a logical programming error. Moreover, the user may interrupt the execution during the execution, which could backfire and result in a transaction failure.

Local error

It occurs when we are doing the transaction, but certain conditions may arise that may cancel the transaction. These errors are typically classified as local errors. A simple example is that data for the transaction may not be available.

We cancel our request or transaction when we want to debit money from an account with an insufficient balance. Therefore, the transaction itself should handle this exception. That way, it isn't treated as a failure.

Controlling concurrency

Generally, concurrency control methods abort transactions to start over since it violates serializability, or we can say that several processes are in a deadlock.

Disk failure

This type of failure occurs when the data on a disk is lost due to a read/write malfunction or when the disk's read/write head is damaged. Transactions may experience this during read/write operations.

Castropher

As well as the physical problems, a long list of problems can arise such as power failure or air-conditioning failure, fire, theft, sabotage, overwriting disks or tapes by accident, and mounting the wrong tape by the operator.

Types of database management systems

DBMSs are many and varied. However, we can divide them into three categories based on the most commonly used databases.

Relational database management systems (RDBMS)

There are two types of DBMSs: relational and object-relational. Databases containing structured data in a table format with predefined relationships interact with them. In addition, they use structured query language (SQL) to interact with databases. The Database Management System category includes popular databases such as Microsoft SQL, MySQL, and Oracle Database.

Document database management systems (DoDBMS)

DoDBMS are used to maintain databases with data stored in JSON-like structures without or with limited relationship structures. Datastore operations are facilitated by query languages such as MongoDB query language (MQL). Some prominent examples of DoDBMS include MongoDB and Azure Cosmos DB.

Columnar database management systems (CDBMS)

Columnar databases store data in columns instead of rows, and this type of DBMS emphasizes high performance as its name implies. Examples of databases using columnar format are Apache Cassandra and Apache HBase.


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