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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Postgresql: replica and HA

I've postgresql 9.4. I'm aware that there are many answer on DBA and SO, I'm aware of the wiki and the documentation. But anyway, I can't understand in a simple way what's the right way to have a ...
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4answers
1k 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
17 views

ACCESS_METHODS_DATASET_PARENT Problem

We had an AlwaysOn Async replica we had some problems so we deleted the availability group After that the database and CPU seem to work abnormally It's very slow and we have waittype = LATCH_EX , ...
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2answers
2k views

Removing secondary replica from SQL Availability Group causes 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
46 views

SQL Server Always On or Mirroring & Log Shipping

We have two data centers with a 2 ms ping time between them connected by a site to site VPN. In the primary data center we have 2 servers, in the secondary data center we have a single database server....
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1answer
486 views

High Availability SQL Server

We currently have a asp.net application running on a Win 2012 dedicated server, with a local copy of SQL 2014 Express. We are looking to add a second web server and have them in a NLB cluster. But ...
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1answer
1k 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 ...
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2answers
4k 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 ...
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1answer
37 views

SQL Server mirroring / failover alternative [closed]

I am looking at building at reliable database with Microsoft SQL Server, with mirroring and automatic failover. The SQL Server here is standard version, not enterprise one so High Availability ...
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28 views

SQL Server 2012 Availability Group (with Synchronous & Asynchronous Replicas)

I have an AG set up in SQL 2012 (sp3), where I have 2 replicas (with synchronous commit & automatic failover) which works very well. When I try to add a 3rd replica (for DR purpose, with ...
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1answer
177 views

By Mistake Deleted AlwaysOn Availability Database from live Production Server

Today by mistake deleted The AlwaysOn Availability Database from live server. Let I am explaining the Details. In AlwaysON Availability Groups, there is 2 Availability Replica. That is Primary ...
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Pgpool2 connection pooling

I have installed both PGPOOL2 3.3 and Postgresql 9.3 db(master) on the same server and in the pgpool.conf file have given the connection parameters as: num_init_children = 100 max_pool = 2 Therefore ...
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48 views

SQL Server 2014 - AlwaysOn HA - Always Synchronizing

I have a Windows Server 2012 R2 cluster with SQL Server 2014 configured in a HA configuration. The secondary databases always say Synchronizing when the data movement is happening. Is this normal? ...
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1answer
39 views

Is it possible to have one server acting as secondary for two primaries on AG?

Can I have a server acting as secondary replica for two primary servers on an availability group? If possible, are there some concerns about performance in an async environment? Are listeners going ...
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0answers
59 views

Quorum Questions For An FCI And AlwaysOn in a WSFC

I was reading the white paper on FCI + AlwaysOn as well as several other resources on quorum voting differences in Windows Server 2008 and 2014 and had 3 questions. 1- Will giving a node in the ...
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1answer
25 views

Setting up HA and a synced up reporting box all together using SQL Server 2014 Standard Edition

Scenario: We are going to upgrade our third party application. Also we are going to upgrade our DBMS from SQL Server 2008 R2 to SQL Server 2014 Standard edition. We also wanted to have a high ...
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0answers
101 views

High Performance Relational DB for Fast Read and Fast Write [closed]

I am looking for the best database solution for a high availability, high performance solution that meets the following requirements. Data being read, written and updated is very simple, and small. ...
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2answers
28 views

SQL Server Cluster + Availability Groups?

I'm actually finding a way to provide a good High Availability and Failover solution while I have a way to manage some sort of horizontal scalability and Load-Balancing... I actually have a SQLServer ...
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1answer
21 views

Backup a hot standby database (streaming replication) whilst it is in recovery

Synchronous Streaming Replicating is set up between a master and a hot standby database. It seems like a good idea to perform daily backups on the standby database to avoid any performance issues ...
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22 views

Quorum Drive needed?

Do I need a quorum drive for configuring Always On on SQL Server 2014? I am sure it is not mandatory as the 'last man standing' concept is based on node and disk majority. But I need a little more ...
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0answers
26 views

Asynchronous Availability Group Secondary Verify Up To Date with Primary Before Backup

I was wondering if there was a way to include a verification step before a backup on a secondary replica under asynchronous commit mode in availability groups to verify that the secondary replica is ...
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2answers
53 views

I'm confused about High Availability/Always On

is High Availability something to describe Log Shipping and Always On ( replica )? is Always on something to describe Log Shipping and High Availability? I'm studying to get my certification 40-762 ...
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2answers
109 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 ...
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1answer
58 views

Sql Server Cluster with multiple nodes

Does it make sense to think about a failover cluster configuration where less than 50% of all included nodes are standby? For example instead of setting up 4 clusters with two nodes each where one is ...
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0answers
29 views

Synchronization report for uncontained objects across each of the replicas in HAG

I have seen How to transfer logins and passwords between instances of SQL Server , Synchronize Availability Group Logins and Jobs and SQL Server 2012 Availability Group Add-in to synchronize ...
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3answers
1k 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 ...
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2answers
10k 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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1answer
48 views

High Availability Options for 2008 R2 or 2014 to 2016 “Mirror” for Reporting?

I'm a BI Developer investigating options for this scenario. I'm going to preface this question by saying I don't know the proper terms, so I will put "quotes" around terms that are probably not the ...
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88 views
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Replicating data from SQL Server 2014 to SQL Server 2005 - temporary solution

I will be installing a new SQL Server 2014 database system, which is based on our current SQL Server 2005 database system. The new system will be on a completely new infrastructure when we go live, ...
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1answer
103 views

Oracle Wallet Error in Red Hat High Availability Resource

Environment: Running Red Hat 7.2, using Pacemaker 1.1.13-10.el7_2.2 and Corosync 2.3.4-7.el7_2.1 to implement cluster failover of an Oracle 12c Enterprise Edition Release 12.1.0.2.0 Database. ...
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1answer
56 views

Mysql only using 10% of cache [duplicate]

I have a dedicated Mysql server that only uses 1.1 GB out of 16 GB ram (picture link 1). I belive this leads to my Disk I/O utilization beeing at 75% peaks (picture link1). How can i configure sql ...
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1answer
78 views

High Availability for MariaDB and Postgres : replication or active-passive (SAN)

During the last weeks I did a lot of research on High Availability for Postgres and MariaDB. Both by my own research and also recommended by vendor's, replications seems to have more advantages. Some ...
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1answer
22 views

Limits of testing HA with a single server replica set?

I'm teaching myself MongoDB HA, going through various replica set scenarios, setting up priorities, arbiters, hidden replica sets, etc. Currently I'm using multiple mongod's on a single Windows ...
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1answer
203 views

Apply SP3 on SQL Server 2012 AlwaysOn AAGs

If Always-On is configured, while applying Service Pack, should I: Directly move SQL Server Instance (Secondary Replica) to make it passive and apply Service Pack Or First move Availability Group ...
2
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1answer
105 views

SQL AlwaysOn & System Center Configuration Manager TP 4 1601

Recently Microsoft released Technical Preview 4 for Configuration Manager (1601). Per TechNet, "Configuration Manager now supports using a SQL Server AlwaysOn availability groups to host the site ...
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1answer
43 views

High availability on a subset of the data

On my site, I have a set of big databases (+6TB total) that is running on a SQL Server 2012 instance. One of these is the main DB and the other ones are archived data that are queried sometimes (...
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0answers
75 views

MaxScale vs Fabric [closed]

I am looking to expand my single MySQL database into multiple instances to provide High Availability. As well, I am looking to be able to have read replicas and to shard in the future. I have looked ...
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1answer
395 views

Where to look for Agent history in Replication?

In SQL server 2008R2 replication configuration, "agent history cleanup distribution" job by default runs every 10 minutes and deletes any historical data older the 48hrs. If I increase the retention ...
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2answers
109 views

SQL SERVER 2014 Standard - High Availability Listener solution

The company has SQL Server 2014 Standard licenses and we're standing the servers up in a VMware environment. My initial plan is to create 2 instances on each DB server and run Instance1 on SQL1 as ...
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1answer
197 views

How do you configure Postgres 9.4 for incremental backups and hot standby?

I want to set up Postgres to do incremental backups. I'm using PostgreSQL 9.4 on Windows with a database that weighs about 1GB and has a growing 10000 records each day. I understood that the steps ...
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1answer
29 views

MySQL: 3 servers on-site architecture

I have 3 servers with RHEL 6 OS and Percona server running in one of the servers in the same data centre, while the other 2 servers lie idle. Now I need to implement some kind of on-site redundancy (...
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2answers
95 views

Avoid user login Directly to AlwaysOn High Availability Primary

I have setup an AlwaysOn High Availability in Sql Server 2014. my IP addresses are according to this : 192.168.1.189 -- Listener 192.168.1.180 -- Replica 192.168.1.181 -- Primary Right now users ...
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1answer
98 views

Master-Master Replication with MySQL Cluster - Duplicate Writes in Both Directions

I have created 2 MySQL Clusters; each cluster is located in a separate geographic location. I have set these clusters up in a Master-Master, Geographic Replication fashion, so that data can be written ...
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0answers
109 views

Which pgpool “mode” for high availability & failover on Postgresql 9.3

I'm in the process of designing a HA setup for a web API & application that uses Postgresql 9.3. To satisfy availability & resiliency, we require: failover to a secondary database instance ...
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0answers
104 views

Simple/Easy PostgreSQL HA multi-master for high latency / unreliable network

I have an environment consisting of two servers running JBOSS and PostgreSQL. Each server writes to its own database and programmaticly synchronises some data to the other database. This causes ...
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1answer
311 views

Compare SQL Server high availability method

I want to provide high availability for my SQL Server. It is important that the service is back as soon as possible, more than making sure that data isn't lost. My SQL Server 2008 R2 is running on a ...
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4answers
2k 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. ...
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3answers
962 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 ...
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1answer
91 views

MySQL Cluster - Management Node Redundancy

I am trying to design a fully redundant MySQL Cluster implementation for a service provider's network. Nodes within this cluster will be geographically separated between towns in the state that the ...