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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3
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2answers
227 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. ...
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1answer
88 views

postgresql 9.4 + BDR Fails

I'm trying to get postgresql 9.4 and BDR working. Following this tutorial: https://wiki.postgresql.org/wiki/BDR_Quick_Start Actually, my sysadmin provided me with a package to test with. He's taken ...
1
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1answer
719 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 ...
2
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0answers
24 views

Alwayson cannot fail over using tsql

I have an Alwayson test environment with the following settings. My test goals are as follows: When SqlNod1 is primary instance, I want SqlNod2 to answer read-only queries. When SqlNod2 is primary ...
1
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1answer
1k 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 ...
0
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0answers
31 views

Couldn't setup postgresql cluster with heartbeat pgsql ra

I'm trying to install postgresql cluster with the following configuration: 2 virtual hosts with RHEL 6.6 x64: postgresql 9.1 with hot standby replication pacemaker 1.1.12 resource-agents 3.9.6 I ...
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1answer
37 views

Reporting services - High availability setup - SQL server 2012

I need some guidance on best practices and setup for SSRS. I have a SQLServer 2012 setup with data source on 1 instance and SSRS on a separate server. There is a need to setup HA and I understand what ...
0
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2answers
27 views

High Availability using SQL Server 2012 requires how many licenses [closed]

For on premise solution, is it possible to implement high availability for SQL Server 2012 using a single license, or, one needs to buy extra licenses? Also, for high availability with SQL Server, ...
0
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1answer
45 views

Need help achieving HAProxy active/passive configuration for mysql

I'm using HAProxy for mysql database backends. The database had to be master-slave. The goal is to point all mysql clients at the proxy and for all requests to go to mysql server #1 and only go to ...
1
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1answer
39 views

Restoring a Database in an Availability Group

I located an extremely helpful process outlined in the thread below, but needed some clarification. This may be a silly question, but I'm a bit new to Availability Groups. In the steps outlined in the ...
1
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2answers
65 views

Maintain Up-To-Date Copy of Very Large Table if Clustering/Partitioning/Moving Operation Needs to be Killed/Rollback

I've appended the following information in a previous post but I asked the 'why' instead of the 'how'. So here's the question... SQL Server 2014, CU6. 4.5 TB database, Simple recovery. The most ...
1
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1answer
41 views

SQL Cluster, AlwaysOn AG, or Something Else? [closed]

I really needs some help with Setting up SQL servers. We are re-configuring our network and have no clue how to resolve our SQL issue. My Network Admin. wants an "Active/Active" with shared storage ...
0
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1answer
17 views

When you use a replica to backup from so you don't have to turn off the master, is this considered High Availablity?

I read somewhere that MySQL can have a master / slave setup in which the master database can continue to run live and in production while the slave database can be turned off to snatch a backup. And ...
0
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0answers
73 views

Is Automatic failover is possible in pgpool?

I have setup the 2 PostgreSQL 9.4 severs with master-slave(Hot standby streaming replication).Is this possible in pgpool-II 3.4 to configure,where it works for automatic failover(network or hardware ...
0
votes
1answer
103 views

Setting up MariaDB Spider HA

I try to setup High Availability using Spider Engine and MariaDB 10.0.14, but I a m not sure what configuration to use to make it work as expected. What I want is: Accessing a remote table using ...
10
votes
5answers
8k 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 ...
0
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0answers
32 views

Fencing a failed application node to isolate it from SQL Server

I have a multi-node server application that is backed by SQL Server 2012, often in a clustered or AlwaysOn AG/FCI HA configuration. My application monitors the health of the application nodes (not the ...
1
vote
1answer
61 views

Syncing Uncontained Objects with AlwaysOn Availability Groups

In setting up our HA environment (AlwaysOn AG), I came across the add-in ssms_2012_ag_addin_setup.exe that I got from SQLSkills. ...
2
votes
2answers
286 views

Change SQL Server 2000 from Active/Active to Active/Passive

I know it's cringe-worthy to use this term, but I have a SQL Server 2000 cluster with one clusetered instance running on it with multiple resources running on one of the two servers in the cluster all ...
2
votes
1answer
416 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? ...
0
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0answers
31 views

Need a High available for Database : HA clustering vs failover with mysql utilities

I intend to setup a high available for database system, I have 2 solutions here : Set up a HA clustering with heartbeat and share storage for 2 nodes as master(to storage the configuration and data ...
2
votes
2answers
276 views

Listener pointing to incorrect AlwaysOn Availability Group

All, Thanks in advance I have two instances of SQL Server 2012 SP1 on a three node WSFC with a HAdr group on each instance with a corresponding listener. Instance 1's listener points to Instance 1, ...
3
votes
1answer
103 views

Effects of turning the transaction safety OFF

I am considering to turn off the transaction safety to maximize the performance. Before that i am interested in finding the current status of transaction safety. Is there any command that we can get ...
0
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0answers
15 views

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 ...
1
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1answer
42 views

Dual site active-active highly available database

I have an application that is being run on two separate sites. Ideally they would share a database, because each application needs to see what the other is writing to the database. However, the sites ...
1
vote
1answer
84 views

SQL Server AlwaysOn to run updates and schema changes in 24/7 environment

First of all i have to say that this question comes from a software engineer-perspective. Unfortunately we have no DBA so we need to administer our own databases. We have SQL Server 2012 Enterprise ...
1
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1answer
223 views

Does “Synchronous-Commit Availability Mode” ensure consistency between Replicas?

If one refers to the MSDN documentation, on Synchronous-Commit Availability Mode, you may read: Under synchronous-commit availability mode (synchronous-commit mode), after being joined to an ...
13
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2answers
3k 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 ...
0
votes
0answers
50 views

migrate standalone postgresql database cluster to high availability cluster

We have tested one setup of postgres HA with repmgr and pgpool. It is working fine and now we have to migrate our existing database to the HA setup. We have two approaches, Make the HA master as ...
1
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3answers
280 views

HA - MySQL Master Master replication - Duplicate entry errors

I am running Percona MySQL 5.5.39 on two masters with keepalived monitoring a VIP which will failover to the standby master if the primary master goes dark. While testing the fault tolerance of my ...
5
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0answers
415 views

AlwaysOn Availability Group error after Windows Update in environment without a failover cluster

Our SQL Server service was down this morning which brought down some of our websites. When I went to check the Windows Event Viewer I saw the following errors: Script level upgrade for database ...
1
vote
1answer
35 views

How to make distributor highly available in Always On Configuration

We have clients requested us to configure Always on with Replication. Microsoft does not support it. "The distributor should not be a host for any of the current (or intended) replicas of the ...
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2answers
636 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 ...
2
votes
1answer
80 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 ...
0
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1answer
60 views

SQL database disaster recovery in a second datacenter using storage

I have the following: Data Center (1) has a set of two Microsoft SQL Server databases. They are clustered using MSCS and shared NetApp storage FAS3250 system. This provides me with local fail-over / ...
1
vote
1answer
54 views

What happens on the primary when log cannot be restored on the secondary on Log Shipping

I would like to setup a log shipping but I have a concern as to what would happen if the restore operation on the secondary would fail for some reason. I want the primary database keep working no ...
0
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0answers
92 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 ...
0
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0answers
48 views

when install pgpool is also needed install hearbeat and watchdog

I am trying to get the PostgreSQL services High Availability (HA) and then I am using pgpool-II. When I install and configure pgpool, the WATCHDOG section seems to doesn't works, then I have a ...
0
votes
1answer
35 views

Altering table on SQL Server 2012 AON High Availability Databases [duplicate]

In a production site, the current configuration I am using is three SQL Server 2012 servers, with some databases configured with AON High Availability. I understand that between the AON High ...
1
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0answers
72 views

how to get pgpool2 HA

I am using pgpool2 and PostgreSQL to get a HA of postgresql service. I have been working in this: .-----. .--------. | | W | DB | | PGP ...
0
votes
1answer
92 views

How the xlogs files travels form Master to Slave

I have some doubts about how the workflow proccess in PostgreSQL replication using archiving logs. If I have this configuration in Master postgresql.conf: archive_command = 'test ! -f ...
1
vote
3answers
70 views

How can I sync databases to a secondary server for read-only usage?

I want to sync databases to a secondary server that will be used read-only for SQL Server Reporting Services. These syncs can be done once or twice nightly and mid morning; synced database sizes ...
1
vote
2answers
143 views

What Current Continuous SQL Server Backup Solutions Are there?

With Mirroring being deprecated in SQL Server 2012 and up along with AlwaysON Availability Groups costing $7k per core, I am wonder what options are there for constant reliable backups with a somewhat ...
2
votes
3answers
279 views

How to check history of primary node in AlwaysOn HA environment?

How do I see history of failovers of the primary node in cluster? I'm trying to figure out at what point secondary node started to act as primary. We are running Windows Server 2012 with SQL Server ...
0
votes
0answers
223 views

Configuring multiple listeners on SQL Server 2012 through High Availability

We have configured two SQL servers on Azure and they are in HA. There are about 10 databases and we wanted to have two critical ones on one dedicated HA group. The listener worked fine until we ...
2
votes
0answers
144 views

AlwaysOn FCI + HA Setup Question

I am planning to create FCI + HA solution in the same datacenter, but running into some problems. I'd really appreciate if someone can provide some guidance. Here is the current configuration (All ...
3
votes
1answer
247 views

timeline 2 of the primary does not match recovery target timeline 1

I want to create a configuration with postgresql and pgpool to get height availability (HA). I want to do this: .-----. .--------. | | W | DB | | APP ...
2
votes
3answers
506 views

Standard Edition High Availability without Shared Storage

I'm a software dev with little experience managing SQL Server so please bear with me. We are developing a piece of software that needs to be highly available, with a significant degree of resilience. ...
2
votes
1answer
274 views

Failover Cluster Diagnostic Logs

I know there must be a simple answer to this question, but I cannot find it anywhere. Our SQL 2012 FCI have SQLDIAG .XEL files in their MSSQL\LOG folder. In some instances, these files are often ...
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vote
2answers
471 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 ...