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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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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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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31 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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44 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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63 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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62 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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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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39 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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115 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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97 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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91 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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875 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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PostgreSQL Failover Issue

I have 3 PostgreSQL (9.1) server's, 1 master and 2 slave. I have configured streaming replication between them. Now when i shutdown the primary server and convert one of the slave to act as primary ( ...
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Issue with DNS after SQL Server 2012 Failover is reinstaled with the same DNS names

I tried to reinstall enviroment with Win2012 and SQL2012 by using the same IP/AD/DNS names for nodes in Win/SQLFailover on the same HW where Win/SQLFailover runned succefully, configurations for ...
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56 views

How do I automate failover in PostgreSQL 9.1?

I am new to PostgreSQL, and I have a task of implementing replication and failover in PostgreSQL database. We are using 2 nodes (1st Primary and 2nd Slave). I have configured the streaming replication ...
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350 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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107 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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273 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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183 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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1k 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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108 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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64 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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144 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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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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208 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 ...
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83 views

changing server roles in streaming replication

I want to implement streaming replication using postgresql-9.2.4 in my reporting application. I came stuck on the below scenario. create master and slave with synchronous replication which is ...
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169 views

Do I need to perform any tasks after Postgres goes into recovery mode?

For starters, I do not have any sort of automated failover in place. After two scenarios, I'm unsure of the state of the database and any required actions, if any, to take: My master server ...
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85 views

Streaming replication setup, sane setup?

Not being a DBA as main profession, I would like to know if the following assumptions are true. I have been searching the net for days and I think I have understand it correctly, but I would like to ...
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Any solution to fix circular replication fail-over?

I've developed a point-of-sale system for our corporation, which has 25+ branches across the country. Each branch has its own MySQL POS database on a WAMP server. I want every event that occurs in ...
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255 views

SQL Server 2012 Failover Cluster and attached SAN

I have three servers in a Windows Server failover cluster. SQL Server 2012 Failover Cluster is installed on all nodes. I have an issue with shared disks attached from SAN. overview with the same ...
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1k views

Problem adding a new node to a SQL Server 2012 Failover Cluster

I tried to add a new node to SQL Server (2012 Standard) Failover, that is already installed on another node in Windows2012 Failover Cluster I have an issue with non editable field wiht input for SQL ...
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69 views

Windows Server failover cluster [closed]

I have 5pcs. IBM System x3650(7979 - ex. ESX/VMWare, planned EOL) now with baremetal Win2012 DataCenter, every machine has the same HW and SW (inc policy). I want to create two clusters (MS SQL), for ...
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496 views

Does Change Data Capture (CDC) work in a SQL Server 2012 AlwaysOn Failover Cluster Instances setup?

Does Change Data Capture (CDC) work in a SQL Server 2012 AlwaysOn Failover Cluster Instances setup? There would be two nodes in the AlwaysOn Failover Cluster Instances setup and two Domain ...
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339 views

Failover only working for Classic ASP, not ASP.net [closed]

Setup: All machines run Windows Server 2008 Enterprise SQL Server 2012 Standard (Primary) SQL Server 2012 Standard (Mirror) SQL Server 2012 Express (Witness) Root issue: Our ASP.NET application is ...
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493 views

Can't set up witness in Repmgr 2.0

I am trying to setup repmgr using the autofailover quick setup tutorial provided on Github Link But I am kind of stuck on the witness section, when trying to create the witness with repmgr -d repmgr ...
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86 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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If I fail over one database, do the others that share the same mirror endpoint fail over as well?

We have two databases setup for mirroring on a single SQL Server instance: a test database and a production database. Both get mirrored to another server using the exact same endpoints. If I go into ...
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780 views

Difference between accessing SQL Server by instance name and cluster name [closed]

I have installed failover clustering feature on two servers with Windows Server 2012 and then I installed SQL Server 2012 on both of them. I also enabled SQL Server 2012 AlwaysOn feature. Now I can ...
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200 views

Failover - automatic switching between servers in Postgresql 9.1

I'm pretty new to Postgresql 9.1 and failover replication. We have a simple master-slave setup, for failover replication, which our application (client) is connected to. On a failure of the master, ...
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335 views

MySQL failover - Master to Master Replication

My company is trying to implement a MySQL failover mechanism, to achieve higher availability in our webservices tier - we commercialize a SaaS solution. To that end we have some low-end VMs scattered ...
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610 views

What is actually happening when postgresql discovers the trigger file and promotes it self from slave to master?

I have a streaming replication setup between two postgres servers (master: server A, slave: server B). I'm wondering what's actually happening under the hood when I touch the trigger file and the ...
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308 views

Restore Database on Active Passive Failover Cluster

Well, I helped my boss's boss install 2 nodes of SQL Server 2008 on a Windows server 2008 failover cluster. I did this remotely and I don't have accesse to it. (I run a active-active cluster on Server ...
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133 views

SQL Server Mirror failover on failing storage

Recently we had an issue with a sql server 2008 r2 HA mirror. I have tried to reproduce this in a lab environment and i came to the conclusion that i am missing something OR something is not possible. ...
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InnoDB Master-Master replication goes inconsistant after power failure tests

Afternoon gents, I'm currently stress testing a Master-Master replication setup using InnoDB as database engine. We're using this simple script for testing which we run in Linux CLI from a remote ...
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433 views

Safely promoting master to slave

Previously I've asked the similar question MySql Switching Masters During Failover with log-slave-updates. Let's say this is our current replication In addition, I have few application servers. ...
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1answer
1k views

SQL Server ODBC Mirror/Failover Partner

Background/Context We are in the process of moving our SQL Server 2000 databases to a mirrored SQL Server 2008 R2 server with a witness and automatic failover. We have both .Net and Access ...
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337 views

PostgreSQL hot standby promotion, multiple hot standbys

I'm trying to work out failover and disaster recovery procedures for a cluster of three servers. Streaming replication is being used with a high wal_keep_segments, no log shipping is happening. I need ...
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Are there any best practices before moving SQL Server to another node (controlled failover)?

Let's say there are multiple jobs running on the SQL Server - we have index maintenance jobs, backups, replication, etc. We would like to perform a switchover using Failover Cluster Manager. Are there ...
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425 views

SQL Server 2005 - Map login to pre-existing user

The short of it is that we have several databases that are synchronized between two failover instances. The primary contains logins that are mapped to the users in the databases, and everything's ...
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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 ...