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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SQL Server mirroring / failover alternative [on hold]

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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20 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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6 views

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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1answer
41 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? ...
2
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1answer
170 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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36 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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50 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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89 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
27 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 ...
2
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1answer
18 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 ...
2
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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
47 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 ...
2
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1answer
47 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 ...
2
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1answer
43 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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1answer
61 views

Backup transaction log from secondary database in alwayson AG

Is it possible to do the log backup from the secondary databases in the AG?
1
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1answer
71 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
95 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
20 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 ...
0
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1answer
159 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 ...
3
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1answer
37 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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62 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 ...
2
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1answer
96 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 ...
2
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1answer
175 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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20 views

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
28 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
76 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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98 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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92 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 ...
0
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1answer
55 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
84 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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1answer
257 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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1answer
85 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 ...
3
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2answers
103 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 ...
1
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1answer
172 views

Promoting warm standby to master with Postgresql 9.4 using streaming replication

I've currently got 2 database servers running Centos 6 and Postgresql 9.4 (identical clones on the same network). They are set up as a primary and a backup created using pg_basebackup from the primary,...
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357 views

pgpoolAdmin for pgpool-II 3.4 : superuser: unknown (Connection error)

I cannot start/stop/reload my nodes through pgpoolAdmin and it says "superuser: unknown" even though I'm logged with the postgres account. What could be the cause? pgpool.conf is identical to another ...
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67 views

How can we plan for a High Availability/Disaster Recovery setup in Postgresql 9.3? [closed]

I am working for mission critical project. We are planning for High Availability. At any point of time irrespective of the failure (network, hw, or db) one db server should be available for the ...
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67 views

IP from a different subnet is registered even after node and resource were removed

We run two SQL server at primary site in AlwaysOn High Availability Group on subnet 10.10.0.0/24 A third SQL server is running on secondary site in a different subnet 10.10.1.0/24 We have had third ...
4
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1answer
64 views

SQL Server - Company wants HA for single instance with 1 userDB - sanity check and questions

I am new to SQL Server (2 months) and learning at a gov company (europe). The job is to make a HA solution for this 1 productive instance (1 database). Following is given SQL Server 2012 Windows ...
6
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0answers
111 views

Low performance, high availability, replicated key/value store with audit trail

I'm looking for a database system with fairly specific specs. I've looked most of the major relational databases and NoSQL products out there and did not find one that even remotely satisfied my ...
2
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1answer
473 views

Rename Availability Group and AG script

I have two questions for you guys. I really appreciate your help. 1.- Is there a way to rename an Availability Group? 2.- Is there a way to get the T-SQL statements in order to re create a ...
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22 views

Create db2 alert for automatic failover

We have two servers in automated failover HADR (TSA installed and haicu configured). How can we create an alert that fires when a failover happens i.e. when the primary server goes down and the ...
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0answers
18 views

HA options for Standard SQL2008

Running SQL 2008 standard with our pants down, no mirror (shut off due to performance hits) shipping logs but that is not going to be good enough. I want an HA option that works. With dual node ...
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1answer
192 views

AlwaysOn Manual failback not working correctly

I've set up a small fail over cluster using AlwaysOn in SQL Server 2014 and Windows 2012R2. The cluster (SQL-CLUSTER-DEMO) just contains 2 SQL nodes (SQL-01 [Primary] & SQL-02 [Secondary]) and a ...
0
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0answers
47 views

Why does my SQL Server HAG fail from PRIMARY to RESOLVING and back again?

I recently noticed our SQL Server High Availability Groups failed from the PRIMARY to the RESOLVING state, and then from RESOLVING to the PRIMARY state, without failing to the SECONDARY state. Does ...
1
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1answer
74 views

Manual sql failover machine with replication

I hope this is the correct place to ask this question. We recently experienced one of our virtual machines being offline for 3 days due to issues in the data center hosting it. This quickly brought us ...
0
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1answer
131 views

Galera and in-memory

i've got a question about Galera cluster + mysql/mariadb and RAM. Basically, mysql cluster needs to run in-memory (https://dev.mysql.com/doc/refman/5.1/en/mysql-cluster-basics.html). But we have a 3 ...
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29 views

Oracle DataGuard [closed]

Maximum performance and Maximum Availability modes has only difference right? Former is async mode and the latter is sync mode wherein it waits for acknowledgement for up to a time and after that it ...