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

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1answer
326 views

When changing startup parameters on a cluster, does each node have to be updated manually?

When moving a SQL 2005 instance to new disks on a two-node Windows 2003 cluster, I changed startup params on the active node to reflect the new paths for the master DB files and error logs. I ...
1
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1answer
450 views

Mitigating MySQL replication delay in single master/multiple slave setup

For a particular web application that requires high availability I am thinking of scaling out by setting-up MySQL replication with one "write" master and multiple "read" slaves (as explained here ...
0
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1answer
138 views

Configure SQL Server Database for High Availability & Warehousing

I have 3 DB servers (DB1, DB2 & DB3 - all on Win 2008 R2 with SQL Standard 2008 R2 in the same datacenter). Let's assume AdventureWorks as an example database. My goal: - Setup DB mirroring with ...
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2answers
1k views

Recommended distributor architecture for transactional replication?

We are planning to create a Transactional replication on 2 nodes of SQL Server 2008 R2, each node will be a publisher and a subscriber. What is the best practice in order to have this scenario done? ...
3
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2answers
458 views

Best high availability solution to avoid maintenance downtime?

We currently only have one production SQL Server 2008 server. Anytime we need to perform maintenance or install patches, it causes downtime as the server reboots. In addition, if the server ever ...
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0answers
103 views

Synchronization between master and backup server

I am searching for an option to synchronize data between production server and backup server automatically. Does somebody know a method, how I can do this: if I delete, insert or update a record it ...
0
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0answers
179 views

How to setup a Postgres-xc streaming replication with master-slave(for HA)?

Can you guys please help me about how to make streaming replication with master-slave configuration using Postgres-xc to confirm an HA environment? Thanks
1
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1answer
553 views

PowerPivot doesn't install in SharePoint mode on an Active/Passive Cluster

We a provisioning a new SQL Failover Cluster. We have successfully configured the SQL instance, and have moved on to configuration of the PowerPivot for SharePoint instance. We run the configuration ...
0
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1answer
114 views

Should we always prefer clustering over a master-slave configuration if the goal is high-availability?

Given: I have two virtual machines on a SAN that I can use to host RavenDB. Question: If my goal is high-availability, then should I always prefer clustering over a master-slave configuration? From ...
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2answers
368 views

SQL Server sync databases between enterprise - web edition

We have an enterprise version of sql server 2012. we need to synchronize its data to a web edition database. what would be the best option t do this ? further to add on to this we need to provide ...
2
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1answer
370 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 ...
4
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2answers
808 views

SQL Server replication for off site copy

We have our Primary SQL Servers in-house (15 primary servers at the moment (500 databases approx overall), most of the servers have hex core processors). These are mirrored to other backup servers in ...
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0answers
117 views

dropping and adding subscription only picking up new article on some subscribers

I have used the following script to drop aand re-add a table from a subscription so I could move replace the ntext fields with nvarchar(max) columns. the script worked fine, but when I ran the ...
3
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1answer
2k 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 ...
5
votes
1answer
540 views

Recovery time effects of Availability Groups

We did different kinds of basic Tests and AlwaysOn passed in many tests. We finally did a heavy write test for AlwaysOn and it gave surprising results. The actual Test details are here, the goal is ...
12
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1answer
2k views

What is the modern way to partition PostgreSQL across machines, when the data is “naturally partitionable”

After several years of dwelling into the "NoSQL" space, now I have a problem that is quite "relational" in its nature. Today I see data stores with quite different eyes than before. Things like Riak ...
2
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0answers
862 views

SQL Server connection with multiSubnetFailover fails, claims mirroring is enabled

I have two SQL Server instances in an availability group. They are not mirrored. I'm trying to connect to the AG using the MS JDBC drivers (4.0) with a connection string including ...
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3answers
248 views

How do I enable READ-only (passive) mode in a particular RDBMS?

As most of you have noticed all StackExchange sites have been under maintenance/recovery a few days ago so they switched on READ-only mode. From their blog I know they used to use MS SQL Server 2008, ...
2
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2answers
477 views

Oracle symmetrical one-way replication for cheap HA: unfashionable or technically unfeasible?

We have two smallish unrelated databases on two big Oracle Enterprise servers. Instead of buying more licenses and servers for high-availability replicas, can we replicate database B to server A and ...
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2answers
3k 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 ...
3
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1answer
4k views

Do Availability Groups support Active/Passive?

I am looking into the licensing of SQL Server 2012 when using Availability Groups with 2 servers. It is not clear to me if Availability Groups are only available as Active/Active and not ...
3
votes
1answer
627 views

Robust Mysql failover using free tools

I am looking for a free solution to set up Mysql in an active/passive configuration, in order to provide high-availability. In particular, a Bugzilla installation, and MediaWiki needs to stay alive ...
8
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2answers
484 views

High Availability for postgresql

I'm new in PostgreSQL database. Recently our developer needed to do some upgrades in our systems. Because of that we are planning to implement some method in order to implement database failover. ...
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1answer
316 views

SQL Server 2012 AlwaysOn cannot connect using the Listener IP

I have setup a Windows network in an Amazon in a VPC. I have setup two SQL servers and configured Always On. Everything works OK, except that I cannot connect to the SQL Server using the AAG Listener ...
2
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2answers
1k views

MySQL cluster - how many hosts are needed for full HA?

I need some clarification on MySQL-Cluster (NDB) setup I want to achieve full HA but I'm low on server budget and can't afford to rent a dozen of servers for simple solution that I'm working on. ...
4
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2answers
396 views

Is MySQL Clustering a viable option for a DB expecting 5TB of data in 5 years?

We plan to implement MySQL Clustering.The database should support 5 years of data and expected data/year is 1TB. When we created a test enviornment with the DB size as 200GB, NDB Cluster took more ...
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0answers
528 views

SQL Server Database Mirroring : strange client application behavior upon failover

I am putting a HA SQL server environment up based on three SQL Server 2008 R2 machines and database mirroring. I'll name them : principal.company.intra mirror.company.intra witness.company.intra ...
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1answer
530 views

Within a RHEL 6.3 + High Reliability Add-on, how do I add DB2 (v9.7) into a service group to have the service controlled by the cluster?

I have a cluster of machines running RHEL 6.3 with the High Reliability Add-on. I have configured a Clustered Logical Volume Manager (CLVM) file system for DB2, which is working correctly. Our DBA's ...
4
votes
1answer
795 views

Transaction Log Truncation with Copy Only

I have a database backup job set to use full backup with the Copy only option on once daily. The copy only is on because from what I have read that is the only way to backup a database that is ...
7
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1answer
1k 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
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1answer
691 views

AG and SQL Backups

I am using always on in sql 2012 and have an AG setup. I would like to know if i were to backup the primary database and restore it would that be allowed without taking the cluster down etc. ...
0
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1answer
180 views

AlwaysOn SQL Server setup questions

I just have a few questions regarding the setup of Always On HA, and Clusters. When you setup an AG, and it gets to setting up your IP address for the cluster how can i switch from using DHCP to a ...
8
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4answers
6k views

SQL Server equivalent to functionality of Oracle RAC?

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 ...
4
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1answer
544 views

SQL Server 2012 - Always On

I am in the process of setting up always on high availability clusters for the first time. Can anyone explain to me from the networking perspective after configuring the group and testing to make sure ...
2
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1answer
177 views

Which database?

We have to launch a new service in my company with a big database. And I currently don't have that much knowledge. We did a small preview of the service and our biggest table had more than 2 100 000 ...
3
votes
1answer
925 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] ...
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0answers
25 views

JBoss/Alfresco cannot write on slave after failover [duplicate]

Possible Duplicate: JBoss don't fail over MySQL slave using datasource I'm trying to set up an high available MySQL "cluster", using a Master / Slave Replication configuration. I want ...
2
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1answer
3k 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 ...
7
votes
2answers
559 views

Can Availability Groups replace transactional replication?

I've been looking at the new features of SQL Server 2012, and how it can help my current situation. Currently we're on SQL Server 2008 R2, and replicate two OLTP servers' databases to a single ...
4
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2answers
4k views

What are the differences between Mirroring and Failover Clustering and when is each one recommended over the other?

What are the main differences between Mirroring and Failover Clustering? What kind of problem each one solves and in what kind of scenarios is each one recommended over the other?
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1answer
120 views

Rolling changes to production databases

We're currently using Clustering to do fail over for our SQL environment. There are two servers that use the same shared drive. The SQL database is on a shared drive. This provides OS and hardware ...
2
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1answer
393 views

Is it possible to automate the configuration of dataguard broker?

We deploy a number of oracle databases every year and a good percentage of them require a dataguard configuration. I've developed a script which is able to perform the database synchronization very ...