sql database errors, causes & prevention

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(No Transcript)
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Microsoft SQL is known as RDMS (Relational
Database Management System) which is developed by
Microsoft and is highly used at corporate and
enterprise level so that it can handle the
database efficiently. This database increases
robust performance of the software by restoring
the data by the means of SQL queries because this
is basically used in the connectivity with the
software user interface. Users can get wide range
of extra features with this MS SQL for the use of
data modeling.
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What is SQL Server Database?

SQL means structure query language and it is a
database management system that is generally used
to store all data and to manage it. However 3
types of data are used to store which
are Primary SQL server database file (MDF) - It
is used to store the startup information of each
database which has one MDF files to store
functions, views, columns, indexes, key, tables
etc. Secondary SQL server database file (NDF) -
This one is optional file which is used to send
data to several disks and to pile up the user
data. Log SQL server database file (LDF) This
one is a backup file and it is used to store log
information
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What are the common SQL database errors?

• There are several types of error messages which
  are displayed and some of them are given below
• Msg 823 error in SQL Server
• Msg 832 (constant page has changed) in SQL Server
• Msg 7105 in SQL Server
• Msg 605 with SQL Server
• Error 17204 and 17207 in SQL Server
• Error 9004 in SQL Server
• Database consistency errors reported by DBCC
  CHECKB
• SQL Server Page Level Corruption
• Corruption on non-clustered indexes
• MS SQL Table Connection Corruption Error

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What are the common factors that cause corruption
in a MS SQL Database?
The error messages which are displayed are due to
the corruption of SQL database and there are
reasons for such corruption. Some of them are

• Media corruption
• Computer virus/malware
• Data storage failure where MDB files are stored
• File header corruption
• Hard disk failure
• Storing SQL database in compressed folders
• Human errors
• Modification in SQL account
• Defective networking device
• Upgrading to SQL server
• Due to power failure/improper system shutdown

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How to prevent MS SQL database from any virus?

• When your SQL database gets infected due to virus
  then there are some prevention ways which should
  be followed
• First use Web application firewall which prevent
  your database from any type of infection
• Check the entered data
• Remove all the unwanted functionality to avoid
  database corruption from any computer hacker
• Always try to use static statements, procedures
  and queries
• Make changes on your application password to
  avoid data from hackers on regular basis.
• Only use limited access account

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How to repair the corrupt MS SQL files?
When SQL database gets corrupt then it needs to
be repaired so that the data can be safe. Some
ways are given which can help to repair the
corrupt MS SQL files. If you have backup file
then you can log on the file By using the
database console commands like CHECKDB, DBCC and
DBCC DEBREPAIR By using third party tool like MS
SQL database recovery tool
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How to Repair Corrupted SQL Server Database
Manually?
When database does not get repaired then it is
instructed to use third party tool like MS SQL
database recovery tool. This is one of the
powerful tool which effectively scans the damaged
database file and after that repairs the
inaccessible objects in .mdf and.ndf files. It
also supports MS SQL server 2000, 2005, and 2008
with higher version. It repair and restores
almost every items from the corrupt database
including tables, keys, views, stored procedures,
triggers, indexes, deleted records and so on.
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