High-availability technologies mask the effects of hardware or software failure, so that perceived downtime for users and applications is minimized.

learn more… | top users | synonyms (1)

4
votes
1answer
4k views

MySQL Replication and High Availability

I know this might not be a very good question to be asked in this site, but I really need some helps/hints to be directed to the right path. I want to have failover strategy for 2 MySQL servers which ...
3
votes
1answer
2k views

Configured MySQL replication but its not working

I have configured MySQL master and slave replication setup on 5.5.x. But for some reason data is not getting replicated properly. What might be the reason? At Master: /etc/my.cnf [mysqld] log-bin=/...
2
votes
2answers
6k views

Creating High Availability Cluster with PostgreSQL

I am new to database design. I have a task to create a high-availability cluster. I Googled a lot, however I haven't found any good way to do this on PostgreSQL. Where should I start and what are ...
1
vote
2answers
624 views

Multi-master + slaves replication in MySQL

I've been playing around with MySQL and tried to create replication topology according to the following picture. Slaves are used as read servers and Masters are used as both read and write servers. ...
1
vote
3answers
935 views

MySQL High Availability for InnoDB

I am looking for MySQL High Availability with huge transactions. I prefer to go with InnoDB Engine. I prefer to use MySQL Master - Slave Replication. However, this option provides us Manual fail over ...
9
votes
1answer
2k views

Do schema changes “break” SQL Server 2012 AlwaysOn or are they handled transparently?

My organization is planning to adopt SQL Server 2012 AlwaysOn and I am trying to understand what impact (if any) it will have on our application upgrade process. We release application updates on an ...
3
votes
1answer
4k views

JBoss don't fail over MySQL slave using datasource

I'm trying to set up an high available MySQL cluster, using a Master / Slave configuration. I want to the slave become master (e.g. not read-only but writeable) if the first node come down (like in ...
2
votes
1answer
460 views

Rename Availability Group and AG script

I have two questions for you guys. I really appreciate your help. 1.- Is there a way to rename an Availability Group? 2.- Is there a way to get the T-SQL statements in order to re create a ...
1
vote
3answers
5k views

Why are my SQL Server 2008R2 databases not mirroring?

I'm trying to set up database mirroring in SQL Server 2008R2. I've taken a full backup and a transactional backup from my principal database and I've restored both WITH NORECOVERY. However, my mirror ...
10
votes
5answers
11k views

SQL Server equivalent to functionality of Oracle RAC? [closed]

I did some Googling and couldn't find an answer to this question more recent than a few years ago, so I thought I'd ask. Oracle's RAC feature offers load-balancing for both read and write transactions,...
4
votes
1answer
6k views

Restoring a SQL Server 2012 database in high availability

I have a database which is in always-on high availability mode synchronized with another database on a different instance. How can I restore from a .bak file into the primary database using T-SQL? I'...
1
vote
1answer
85 views

MySQL Cluster - Management Node Redundancy

I am trying to design a fully redundant MySQL Cluster implementation for a service provider's network. Nodes within this cluster will be geographically separated between towns in the state that the ...
0
votes
1answer
5k views

How to run SQL Job only on primary replica in AlwaysOn Availability Groups? [duplicate]

I have SQL Jobs that need to only on primary replica on AlwaysOn Availability Group. When jobs were originally created ServerA was primary, at later point ServerB became primary so jobs that were on ...
3
votes
2answers
4k views

SQL Server 2012 High Availability on VMware virtualization

We're going to host a large SQL Server 2012 under a VMware virtualization and we need it to be highly available. These are the three options I found supported, but couldn't find a lot of info and ...
3
votes
1answer
2k views

Mirroring not working after a server crash

I'm using SQL Server 2008R2. Last night, the host machine on which my mirror database was running basically went belly up. Thankfully the principle database was on a different host server and so was ...
2
votes
1answer
663 views

AlwaysOn Availability Groups: Confusion with some concepts

In Sql Server 2012, I am trying to install Failover Clustering to configure AlwaysOn Availability Groups. When I run Cluster Validation test wizard, it comes back with a lot of errors. One of them ...
0
votes
1answer
55 views

Mysql only using 10% of cache [duplicate]

I have a dedicated Mysql server that only uses 1.1 GB out of 16 GB ram (picture link 1). I belive this leads to my Disk I/O utilization beeing at 75% peaks (picture link1). How can i configure sql ...