SQL Server Recovery Business systems are usually made up of databases. There are databases for
customers, for accounting and for product design. One of the more common
database systems is Microsoft's SQL server. This robust and dynamic system
provides a solution to a company's business system.
The data that is inside
a business database is valuable and so is the database itself-it can take
weeks or months to set one up completely. When a
SQL database cannot access the data,
your client's solution is Ontrack Data
Recovery Services. Using specialized tools that we have designed for
SQL recoveries plus our
Remote Data Recovery service, you
have a strong data recovery solution. But what is SQL server and what can go
wrong?
What is SQL? How is used?
Microsoft® SQL server is a business enterprise software package that manages
data through a client/server relational database. There are four fundamental
aspects to a SQL (Structured Query Language) server.
- Database File
- Relational Database Concept
- Client/Server System
- Database Management System (DBMS)
The Database File refers to the physical file that contains the data
the SQL server manages. This file is more than just a container for data. SQL
files, or .MDF files, are highly organized and complex. The file is designed
like this so that SQL server can handle multiple data transactions at once.
The Relational Database Concept is the method employed to organize
the data; this is separate from the internal organization of the file itself.
Relational Database Concept systems use mathematical set theory to organize
the data in the most effective way. Data organization is critical to
maintaining the speed of the database server.
The Client/Server System refers to the part of SQL server that
communicates with the operating system. This part of the system needs to
manage the server's resources, connections and managing multiple databases at
the same time.
The Database Management System interacts and works will all the
above items. Not only does this manage the internal structure of the .MDF
file, DBMS also controls the Relational Database side of things and organizes
the data. The DBMS of SQL server is the heart of the system.
Data loss situations-What can happen?
Data loss situations can occur at a number of different levels. The first
level of data loss starts with the storage device. This can be a single hard
disk or a SAN or RAID storage array. If loss is at this level, Ontrack's goal
is get the storage device operational so that the data can be copied off.
Ontrack's clean room engineers work at an electronic and mechanical level to
get the device operational. If the storage device is a SAN or RAID array, the
goal is to get that storage device operational and the data copied off. SAN
and RAID arrays add a challenging level to the complexity of the job. Ontrack
has excelled in specific techniques to handle these storage devices.
The second level of data loss can start at a file system
level. The file system is a unique method of storing and organizing system and
user files. The operating system controls the file system. If the information
about where data files are on the volume are damaged or lost, then adjustments
or repairs need to be completed at a file system level. Once the file system
is repaired then the file's data stream can be accessed correctly. Most
operating systems have a utility that will automatically fix the file system.
These utilities work to make the volume accessible. However, this can
permanently damage the data stream of the file.
The third level of data loss can occur within the file itself. As
previously mentioned, .MDF files are quite complex. The internal structure can
be corrupted to the point where the DBMS will not make the database available.
This is where Ontrack excels in providing a total data recovery solution.
Ontrack's solution to data disasters
Ontrack has the solution to corrupted or
damaged SQL database files and we can use our
Remote Data Recovery technology to
get the data back as fast as possible. Ontrack's internal SQL recovery toolset
was designed to retrieve the data contained within the .MDF file.
The process of a SQL recovery
begins with finding the database file requested. If the database file is
inaccessible due to problems with the storage device, then we work to get that
data extracted. If the file is missing, deleted or truncated due to problems
with the file system, then we work to adjust or repair the file system to
correctly point to the data stream of the file. And finally if the file system
has no pointers at all to the file, then we search the entire drive looking
for SQL data.
The next stage is to work on the database file itself. This is where the
SQL toolset comes. These tools analyze the complex internal structures of the
.MDF file and provide reports as to what tables are recoverable. The reports
also list the number of data rows that will come back.
Once the evaluation is complete and authorization is given to recover the
data, our SQL toolset will copy the data into another SQL server database.
After this phase is complete, we can backup or archive the recovered data.
Remote Data Recovery is the fastest solution for SQL recoveries. The Remote
Data Recovery process will copy the recovered data into a SQL server that is
setup on you or your client's site. They only need SQL server running. For
best results we recommend that the storage device we are working on be
connected to a SQL server, because all of the data transactions will be
occurring on a single machine.
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