The processes of creating a point in time copy of data.

learn more… | top users | synonyms

2
votes
1answer
3k views

How to Create Snapshot Backups in MySQL

I've seen a lot of people talking about snapshots backup, even I'm reading a book about mysql but nobody explain the code how to make a snapshots backup. This is what the book says: flush tables ...
8
votes
1answer
534 views

Are SQL Server Database writes slower with Snapshot Isolation?

I have a lot of deadlocks going on in my system. I would like to use Snapshot Isolation to fix them, but my DBA has reserves about it. One of his concerns is that Snapshot Isolation slows down ...
2
votes
2answers
1k views

SQL Server: in what situation can snapshot restore be blocked after SET SINGLE_USER?

In my tests, i have the following script: USE master; ALTER DATABASE [TestDB] SET SINGLE_USER WITH ROLLBACK IMMEDIATE RESTORE DATABASE [TestDB] FROM DATABASE_SNAPSHOT = 'TestDBSnapshot' In some ...
7
votes
2answers
833 views

Advantage of using a database snapshot for reporting purposes

What is the performance advantage of using a snapshot of a database for reporting purposes? The way I see it, it would probably downgrade performance since for every write in the original database, ...
2
votes
1answer
433 views

Oracle Materialized View

I need your help with a issue on Oracle Materialized View. I created the Materialized View using the following command: CREATE MATERIALIZED VIEW SNAP_TEST TABLESPACE tbs NOCACHE LOGGING NOPARALLEL ...
5
votes
1answer
2k views

Remote queries at SNAPSHOT isolation level

I'm experimenting with snapshot isolation level. Whenever I try to access a linked server, I get an error: Remote access is not supported for transaction isolation level "SNAPSHOT" I wasn't able ...
0
votes
1answer
408 views

ADDM report dba_hist_snapshot

How does ADDM report work? When I take two snapshots one for START: 05-OCT-2011 09:00:00, END : 05-OCT-2011 10:00:00 and another one for START: 06-OCT-2011 09:00:00, END : 06-OCT-2011 ...
4
votes
1answer
833 views

Why are Stored Procedure schema changes not being replicated when using ”initialize with backup”?

In SQL Server I have set up transational replication using the "initialize with backup" option. Data is being replicated fine, as are schema changes to tables. However, schema changes to stored ...
22
votes
3answers
4k views

Is it possible to quickly create/restore database snapshots with PostgreSQL?

First of all, I'm a developer, not a DBA or sysadmin; please be gentle :) I'm working on an application workflow where a single user action will trigger complex changes in the database - creating ...
2
votes
2answers
2k views

What is the best way to automatically create a snapshot of the table at the certain time?

I have running and quite loaded PostgreSQL server. I need to take snapshots of the certain tables at the certain time (midnight). Those tables are pretty loaded (a lot of updates and inserts). What ...