Failover is the concept of moving services from one host or node to another in order to provide high availability in a computing system.

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How to configure Mysql database for highavailability and failover? [duplicate]

I have a web application written in java with Mysql database. I want to ensure high availability of my database server, hence i have configured master-slave replication mode. All my reads goes to ...
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Backing up AWS database to an on premise server

I have 2 questions - 1) Are there tools, AWS provided or otherwise, which can continuously backup a cloud-based database (Postgresql RDS) to an on-premise server ? 2) I want to do this, so that I ...
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30 views

Error while duplicating Oracle database after failover, using 11.2.0.4

I've recently updated oracle from version 11.2.0.1 to 11.2.0.4 and my redundant system is no longer able to recover from failover. I'm using scripts both on primary and standby node to get back to a ...
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26 views

Postgresql - Streaming replication - STONITH

Current situation: PostgreSQL, streaming replication Master failed, I created the trigger file. Slave is promoted to new master After the old master restarted successfully, I have to create base ...
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42 views

MySQL Master-Master-Slave failover

I have setup a Master-Master configuration in MySQL with one additional slave, like this: Master1 <-> Master2 <- Slave Master1 is the write master used by my application, Master2 is used ...
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43 views

Breaking changes between 2008R2 RTM going to 2008R2 SP3?

I have a few A/P FCIs running 2008R2 RTM, and I'd like to upgrade the passive node to SP3, fail over, and then upgrade the formerly passive node. Has anyone else attempted this? Are there breaking ...
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104 views

pgpool-II Master Slave mode / Load Balance Mode / Watchdog On result many primary servers

I installed pgpool-II in Centos6.5, Master Slave mode / Load Balance Mode / Watchdog On but three postgresql servers are all primary server, shows as below: IP Address Port Status Weight ...
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52 views

Postgres automatic failover, multiple clients to multiple masters

I'm looking into providing a method of having multiple hot spare PostgreSQL instances to our website. The majority of implementations that I have found require a single point of failure with PgPool ...
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36 views

Effects of renaming FC and using its original name for AG network name

We have a Failover Cluster, named MainSQL consisting of MainSQL01 and MailSQL02 which are default named instances and we can connect to whichever is the active node with just simply MainSQL. If we ...
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34 views

how to change the backend order in pgpool

I want to change the backends order in pgpool. I want to keep my master host always as the first backend. I have been configure the failover command: NEW_MASTER_INFO=($(PcpNodeInfo ...
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1answer
55 views

MongoDB failover process

Hello guys I've been all over the MongoDB documentation (http://docs.mongodb.org) and I can't find a solution to my problem. Imagine the following scenario: I have 2 Nodes (1000Km apart). Both nodes ...
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53 views

pgpool-II doesn't execute my failover script

I have been installed pgpool-II 3.3.4 from source. I have two pgpool nodes and I also used the watchdog configuration to get a pgpool services with High Availability. When I stop one, the other wake ...
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1answer
31 views

Mysql Server version: 5.0.77-log Source distribution

I have a master(M)-slave(S) replication on MySQL. During a failover test, the master was brought down and the slave was made the master by doing STOP SLAVE; RESET MASTER;. Since there are only 2 ...
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1answer
36 views

Several mongod instances that do automatic failover without duplication of data?

Because we don't have much storage space and we already have a RAID system for data availability, we don't want to use mongodb's replication set with duplication of data. I just want to know if ...
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60 views

Prevent SQL Server failback after cluster aware updating

We have SQL Server 2012 in a two-node cluster with Windows Server 2012 (node and disk majority). Neither of the nodes are marked as preferred owner and the "Prevent Failback" option is selected. ...
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1answer
229 views

Promotion of PostgreSQL standby and application reconnection

Background: I work for a small company. We have been using PostgreSQL on Heroku as one of our core technologies. While, in general, we've been happy with Heroku, the company has made the decision ...
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1answer
154 views

PostgreSQL Automatic Failover (Trigger File Creation)?

Is there a way to detect if the master PostgreSQL (9.3) server becomes unresponsive, and if so, create the trigger file (that is specified in recovery.conf) that initiates the failover process? Or ...
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2answers
261 views

Avoiding MySQL Fabric to become a single point of failure

I managed to install and configure MySQL Fabric that manages multiple MySQL Server nodes. It works very well since I tested it by connecting to the Master node directly and played with the data ...
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1answer
249 views

MongoDB: Manual failover and failback between two datacenters?

This is about MongoDB and datacenter failover and failback. We're thinking about using two datacenters and this MongoDB replica set: DC1-M1 prio 1, votes 1 (datacenter 1, member 1) DC1-M2 prio 1, ...
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1answer
222 views

Complete Failover Cluster Failure SQL Server 2012

We have experienced a full cluster failure on our 3 node cluster running SQL Server 2008 R2 with 7 SQL Server instances. It started when we rebooted one of the nodes and it returned an error: Node ...
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1answer
75 views

Log shipping - failed over to secondary, how to fail back

SQL 2012 I've been researching and testing Log Shipping as a DR solution. I got the two servers setup. Log shipping is in place and verified to be working correctly. I failed over by restoring the ...
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32 views

Windows Clustering 2008 R2

I'm trying to build a Windows cluster with 3 nodes, 2 Active and 1 Passive, And If I have to build in a way like N1 Active - N3 Passive will be refer as "cluster network 1" and N2 Active and N3 ...
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159 views

Can you upgrade a single SQL Server 2008 Failover Cluster Instance to SQL Server 2012?

Or do you have to upgrade every FCI on the Failover Cluster? The documentation doesn't seem to be clear. We have a 7 instances on a 3 node cluster. We want to upgrade only one of the instances from ...
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45 views

PostgreSQL Failover strategy

I'm lost when it comes to choose the failover technology for my postgresql database. The options I currently see are: PG Cluster Streaming Replication Warm Standby (log shipping?) Hot Standby Is ...
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60 views

Failover cluster connection issue

I'm trying to run SQL Server Failover cluster in Azure. I have NODE1 and NODE2 in a cluster and another SERVER in the same network trying to connect to the database server using the instance from ...
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208 views

AlwaysOn Availability Group: Users on Secondary Server

We have an AlwaysOn Availability Group setup (DB1+DB2) and also a web server (Web1) outside of the domain that we need to connect to the AG using Windows Authentication. The following Windows ...
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161 views

Min no. of replicas to set up SQL Server Always ON over a Failover Cluster on a Windows Cluster

AO: Always ON FCI: Failover Cluster Instance WSFC: Windows Server Failover Cluster I'm scratching the surface of AO. I currently have one SQL 2012 FCI on a WSFC. Which means one Active node at a ...
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450 views

MS SQL Server 2012 Failover Cluster connection issue

I was about to give up with this but I'll give it a go here if anyone can help. I've set up a fail-over cluster SQL Server with 2 SQL nodes, Domain controller and file witness. All seems to work ...
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33 views

Failover Mirror

My name is Jackson and I'm from Brazil, sorry about my English. My question is about the failover process in SQL Server Mirror. Question: If just the database, not a instance or a server, goes ...
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1answer
113 views

How Automatic Failover Works (AlwaysOn)

I'm going to use AlwaysOn technology on my servers, but it's some unclear points in the documentation: Automatic failover looks like Primary replica (A) unaccessable Secondary replica (B) becomes ...
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1answer
718 views

How to Configure PostgreSQL Hotstandby Automatic Failover

So I have configured two postgeSQL servers to have hotstand by streaming, now my question is, how can I configure it so that when the master server goes down, the slave server will become the new ...
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1answer
585 views

AlwaysOn Availability Group Forced Failover

May I request your input. I setup SQL 2012 with always on availability group for my databases in sync and secondary readable mode. I completed failover tests with sync mode and it is functioning as ...
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143 views

Heartbeat Options with MySQL and Possibilities

I would like to understand if the following scenarios are possible in Heartbeat in Linux. Setup: Two Database Servers running Mysql in Active/Passive mode in replication mode having Heartbeat setup ...
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213 views

How to update SQL Server 2005 clustered instances?

We have a 3 node cluster with an instance running on each. Windows 2003 R2 32bit (16GB) / SQL Server 2005 I want to bring them all up to build 9.00.5266 (SP 4 + CU3) (1 Node is already updated) The ...
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145 views

Is there failover server parameter in PostgreSQL connection string?

Is there failover server parameter in PostgreSQL connection string that can be used to automatically switch from primary server to secondary sever ? We have been using similar functionality on MS SQL ...
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1answer
55 views

Automatic Failover without data replication

I have a need to be able to automatically failover my databases and most need data replication. However, one database does not need data replication and so, for performance reasons, we do not include ...
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2answers
273 views

Automatic Failover in Availability Group

I have 2 nodes in my SQL server fail over cluster. I use SQL Server 2012 Availability Groups for HA purpose. The problem is that when one my server goes down the automatic fail over does not happen! ...
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1answer
143 views

SQL Server Standard High Availability (HA) with two nodes

Is it possible to accomplish High Availability (HA) with two SQL Server Standard nodes ? We can't use SQL Server 2012 AlwaysOn without Groups as it has single point of failure by using the "single" ...
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1answer
244 views

Can we use old primary to sync with standby after failover in PostgreSQL?

If my standby (postgres) is behind by few seconds before failover. What is the easiest way to sync back my old primary after failover in PostgreSQL. In Oracle we have the option of Reinstating a ...
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6k views

Clustering vs. transactional replication vs. availability groups

Assuming you need to make sure your application that relies on SQL Server 2012 as its database backend is available around the clock, even if one server machine fails. As a developer and not a DBA, I ...
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704 views

Is MSDTC required for SQL Server 2012 Fail Over Cluster?

I am making a 2 node SQL Server 2012 Fail Over Cluster, do I need to install MSDTC also? If yes then can both be installed on single shared disk?
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135 views

Single disk for Data, System, User, Temp and Backup when installing Fail Over Cluster?

I have a Windows cluster with two nodes. I am trying to make Fail Over Cluster using SQL Server 2012. On both nodes there is 2 TB storage available which I can access as: ...
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1answer
776 views

Failover scenario with principal “hard down”

My company has a failover pair of SQL Server 2005 instances, which provide database availability for a UL-licensed alarm/call center, where uptime and availability are critical for life safety. ...
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305 views

Understanding disk requirement to make fail over cluster

Please take a look at the following screenshot. I am trying to make SQL Server 2012 Fail Over Cluster using two nodes. As you know we need to have a shared SAN which will be used by both nodes to ...
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2answers
3k views

Understanding two NICs requirement for SQL fail over cluster

I am trying to make an SQL Server 2013 fail over cluster. I have two DB machines. I understand that both machines need 2 NICs each. In my organization the IP scheme assigned is something like ...
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1answer
276 views

RBS and Fail Over Cluster with SQL Server 2012

I am trying to install one SQL Server 2012 cluster with two nodes. I will also be enabling Remote Blob Storage (RBS) on server so I was wondering if I need to take something in account while ...
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1answer
77 views

How do I set up high availability at the instance level? [closed]

I have two database instances (Instance A, Instance B) of SQL Server, each one hosted on a separate VM using windows server 2012. Instance A has SQL Server 2008 R2, instance B has Sql server 2012. I'm ...
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170 views

Get missed transactions from slave

I'm trying to write a disaster recovery plan, I have one way replication with 1 master(A) and 3 slaves(B,C,D) A /|\ / | \ B C D Let's say my master crash, and I loose all data on ...
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244 views

Postgresql Streaming Replication - pgpool2 - failover

In my scenario I want pgpool to forward read only queries to slaves when the master goes down - I want my app to be in the "read only mode". How do I setup pgpool to accept read only queries when ...
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1answer
392 views

TDE in a SQL Cluster

I'm researchig into databnase encryption and whilst TDE seems to do exactly what it says on the tin, there seems to be no information on how to configure it up in a Microsoft failover SQL Cluster, or ...