Backup and restore

External Article

How to identify when a database was restored, the source of the backup and the date of the backup

  • Article

After restoring a database your users will typically run some queries to verify the data is as expected. However, there are times when your users may question whether the restore was done using the correct backup file. In this tip I will show you how you can identify the file(s) that was used for the restore, when the backup actually occured and when the database was restored.

2009-10-27

4,162 reads

External Article

A Technical Case Study: Fast and Reliable Backup and Restore of Multi-Terabytes Database over the Network

  • Article

Database sizes increase constantly, as do requirements for access and availability. At the same time, it is more important than ever to have a fast and reliable backup and recovery plan in place. This document discusses the challenges of designing a robust backup and restore solutions for very large databases (VLDBs). Using a real-world example, it demonstrates how to make the best use of the backup and restore features of SQL Server 2008 to help create a fast and reliable backup and restore plan for VLDBs over the network.

2009-09-25

2,989 reads

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Question of the Day

The string_agg function

We create the following table and then insert some records in it:

create table t1 (
   id int primary key,
   category char(1) not null,
   product varchar(50)
);

insert into t1 values
(1, 'A', 'Product 1'),
(2, 'A', 'Product 2'),
(3, 'A', 'Product 3'),
(4, 'B', 'Product 4'),
(5, 'B', 'Product 5');
What happens if we execute the following query in both Sql Server and PostgreSQL?
select id, 
category, 
string_agg(product, ';')
                 over (partition by category order by id
                 rows between unbounded preceding and unbounded following) as stragg
from t1;

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