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1answer
35 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 ...
0
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2answers
65 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 ...
0
votes
1answer
107 views

PgPool 2 with HA Proxy

So, I'm looking to add high availability to a postgresql server. I've looked into some tutorials on the web but, haven't been able to find exactly what I'm looking for. E.g.: PostgreSQL ...
3
votes
2answers
75 views

SQL Server Database Mirroring is going to die. How can I guarantee high availability now?

The Database Mirroring feature of SQL Server is going to die: This feature will be removed in a future version of Microsoft SQL Server. Avoid using this feature in new development work, and plan ...
3
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2answers
47 views

Replication with FileStream

I need to setup database replication (for high availability) on a database that uses FileStream. This is on SQL Server 2012 Standard Edition, so Always On or Peer-to-Peer replication is not an option. ...
1
vote
1answer
24 views

Connecting to Active Active Cluster Services

I have a two node active active cluster setup as below: NODE 1 - SQLINST1 ( with DTC1 ) NODE 2 - SQLINST2 ( with DTC2 ) I wish to now have the application connect to SQLINST2 whenever ...
3
votes
1answer
167 views

Three Node Cluster that Allows For Two Failures

We are creating a three-node three-instance cluster with SQL 2008 R2 (not cutting edge, but that is what the application supports) and think it should be able to maintain quorum with two physical ...
3
votes
1answer
355 views

PostgreSQL High Availability/Scalability using HAProxy and PGBouncer

I have multiple PostgreSQL servers for a web application. Typically one master and multiple slaves in hot standby mode (asynchronous streaming replication). I use PGBouncer for connection pooling: ...
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0answers
343 views

Is there a complete list of Online operations for each SQL Server version?

As we are about to change some of the large tables in our 5TB database I found myself needing a list of the operations that can be performed online and the which require full locks to be held while ...
1
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2answers
87 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
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1answer
62 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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2answers
3k 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
191 views

SQL Server 2008-R2/2012 with Failover Cluster - minimizing downtime of program updates

I have SQL Server 2008-R2 with Failover Cluster like this. Planning to upgrade to SQL Server 2012. Problem - The downtime of my program updates (not Microsoft updates/patches). Both of my cluster ...
3
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1answer
3k 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 ...
5
votes
1answer
379 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 ...
1
vote
0answers
84 views

DPM and AlwaysOn - Can they work

How does AlwaysOn tie into DPM for SQL Server 2012? Can we use one or the other for High Availability ? Can they work together or must they be used separately. Thanks
0
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0answers
30 views

Recommended plan for 0min RTO and RPO

I have a Windows Server 2008R2 Server, running SQL Server 2008R2 SP2. The server currently only does a full backup once daily. The server's operational hours are between 8am and 5pm. The server's new ...
2
votes
1answer
258 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 ...
0
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0answers
117 views

High availability PostgreSQL 9.3 server on Windows

I'm trying to set up PostgreSQL 9.3 server in HA mode on 2 Windows servers. Final solution should be deployed to Microsoft azure network, so there are few limitations. Since Microsoft is doing ...
0
votes
1answer
29 views

MySQL Database inside a VM on a high availablity cluster

I'm looking to do an infrastructure overhaul.Currently I have a ton of small databases scattered amongst our assets and I wish to consolidate them. Is consolidating all databases to 1 tuned database ...
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0answers
87 views

Removing Secondary Replica from SQL Availability Group Causs Large Log File

Due to an unforeseen hardware error, I had to take our secondary replicas down for maintenance. This was really due to a storage issue and, it was decided at a higher level, to purchase a new storage ...
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2answers
394 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 ...
3
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0answers
62 views

ENABLE_BROKER vs NORECOVERY

I have two nodes with MSSQL2012 which work with AlwaysOn High Availability After some crash I had to remove db from availability group on the one of the nodes. For restoration I've made backup ...
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0answers
386 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 ...
1
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1answer
693 views

MySQL: Alter Table on very active table gives “Waiting for table metadata lock”

At my work, we've recently upgraded to MySQL 5.5 and since then, have been bitten a few times by the new (and intended) behavior of metadata locking. Basically, whenever we run an ALTER TABLE ...
1
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1answer
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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0answers
156 views

Streaming Replication Resource Management (PGSQL) on FreeBSD 8.x

I am attempting to set up PGSQL-HA streaming replication on freeBSD 8.2 (willing to upgrade to 8.4 if need be). The set up is simple: 2 nodes, one active one standby. I have successfully set up ...
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0answers
18 views

SQL Server 2012 High Availability on VMware virtualization [duplicate]

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 ...
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2answers
985 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
177 views

SQL Server DR, mirroring or virtualise and mirror

I have a client with a small business server 2008 Premium installation. This obviously includes SQL Server 2008 standard on a separate 2008 server. On the SQL we run several line of business ...
2
votes
1answer
190 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
vote
1answer
271 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
votes
1answer
111 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 ...
5
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2answers
523 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
310 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 ...
0
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0answers
87 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
138 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
342 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
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 ...
0
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0answers
31 views

Table partionning problem

I need your help for a partionning problem. We are using a "log_event" table which log a lot of events sent by our players (subscription, connection, play, share, etc...). We insert 5,000 row / s in ...
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4answers
4k 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 ...
0
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2answers
257 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 ...
3
votes
1answer
566 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. ...
2
votes
1answer
250 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
votes
2answers
536 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
87 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
votes
1answer
1k 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 ...
11
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1answer
1k 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 ...
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1answer
172 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 ...
2
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0answers
511 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 ...