How to synchronize large SQL Server databases

When synchronizing large databases that contain millions of records, you will come across several challenges The first challenge is to just compare such databases. When the database tables contain millions of records, their comparison through the ApexSQL Data Diff graphical interface will be very slow and in such cases, it is strongly recommend using the ApexSQL Data Diff command line interface. As there’s no need to show millions of records visually in the tool’s grid, such large databases are processed faster.

April 29, 2013

Synchronize SQL Server databases in different remote sources

The scenarios

The applications used by travelling sales representatives, or other field workers – delivery drivers, visiting nurses, etc. are designed to collect data from remote locations and then send it to a data center. Also, the data from the data center, occasionally need to be sent back to these remote locations, to keep them up to date.

For example, whenever nurses pay a visit to a patient, they enter the information about the visit into the database on mobile devices. At the end of the day, all these entries created during the day are sent to the central database in a hospital. After that, the nurses can synchronize mobile devices with the database in the hospital data center, so they get the new information about their patients, and also, the information about any new visits they need to make the next day.

In the scenario such as this, there’s constantly a need to synchronize the information from a mobile device to a central database.

April 19, 2013

Automatically compare and synchronize SQL Server data

There are numerous scenarios when data synchronization between the two databases is needed, such as distributing data to different locations, integration of data from different locations into a central repository, or just a simple synchronization between your test and production database.

The recommended solution is to use database replication.

However, even with database replication there’s a need to check whether all the data is synchronized and to synchronize it if needed.

April 4, 2013

How to migrate a SQL Server database to a newer version of SQL Server

DBAs are well aware that downgrading a SQL Server database cannot be done out of the box. Even when the compatibility level of the database you want to migrate to an older SQL Server version matches that version, you can’t simply restore the backup. What you probably didn’t expect is that upgrading can also be a problem

April 4, 2013

How to restore a SQL Server database backup to an older version of SQL Server

If there was need to restore a SQL Server database backup to an older version of SQL Server there was “greeting” with error messages along the lines of:

Msg 3169, Level 16, State 1, Line 1
Msg 3013, Level 16, State 1, Line 1 RESTORE DATABASE is terminating abnormally.

or

Msg 3241, Level 16, State 7, Line 1
Msg 3013, Level 16, State 1, Line 1 RESTORE DATABASE is terminating abnormally.

and the attempted backup restore would fail.

April 4, 2013

Restore only specific data from SQL backups

If you ever needed to quickly revert an inadvertent change such as an UPDATE without a WHERE clause, to recover missing or corrupt data, to move data across your development, test, integration and production environments or even just to avoid generating a report using a busy production SQL Server database as a data source, you must’ve wondered if there is a way just to restore specific rows instead of restoring the whole database backup.

April 4, 2013

How to recover only individual rows from backups

“I’ve mistakenly deleted/updated important records in a SQL Server table. Is there any way to get these records back?”

This is a frequently asked question, and very often a headache for DBAs. If they are careful and make regular database backups, they can recover the lost database data even where the SIMPLE recovery database model is used

If that is the case, then database backups are the only solution to recover the lost database data. The deleted data has to be from the period prior to the database backup creation

April 4, 2013