Questions tagged [disaster-recovery]

A set of policies and/or procedures that enable the recovery or continuation of vital infrastructure and systems. Please be sure to include what DBMS you are using.

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SQL alwayson AG Disaster Recovery

Need advise on below: I have 2 node alwayson AG on Primary Sync mode in the current configuration and fsw is in Primary DC only Actually during Switchover the entire DC 2 node and fsw will be down ...
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1answer
26 views

PostgreSQL WAL Archival Best Practices?

The postgresql documentation gives an example archive_command of archive_command = 'test ! -f /mnt/server/archivedir/%f && cp %p /mnt/server/archivedir/%f' # Unix but adds the disclaimer ...
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114 views

AlwaysOn availability group DR failover with Powershell

I am setting up AlwaysOn availability group for Disaster Recovery (DR) in the test environment. For AG1, node1 and node2 (synchronous commit/automatic failover) are in DC1; node 3 and node 4 (...
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47 views

Good practices for patching SQL nodes in High Availability solution [duplicate]

Our database structure utilizes two roles in the Window Failover Cluster Manager. One is for FCI - switching between the active/passive node in the Primary Data center. One is for SQL Availability ...
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1answer
31 views

SQL server Log Shipping

I have two node SQL server standard failover cluster. I need to setup single node DR using log Shipping method. Want to ask after switch over to DR how we can setup, plan so that application can ...
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2answers
26 views

SQL server alwayson 3 Node Primary Down

I am using three node alwayson Availability Group SQL 2012 Enterprise Edition. 2 Node in DC with File Share Witness quorum also in DC and third node to be setup in DR I need to perform a DR switchover ...
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0answers
18 views

SQL DR Availability Group cluster validation failure

I'm new to DBA out of necessity at work so please explain or point me in the right resources if you see anything I ask below is wrong: I'm trying to setup a test environment for Disaster Recovery ...
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0answers
23 views

Splitting file groups of large SQL Server database using FileStream

Background: I have a SQL Server database which is storing documents in the file stream. These documents are usually accessed via Web API by Mobile Apps and Modern JS Apps. The size of the database ...
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1answer
35 views

SSD used for tablespace died. How can I recover data?

I have a postgres cluster with two databases Database A uses the default tablespace. It holds important information but has very few writes per day (< 20) and only has a few tables with a few ...
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1answer
51 views

Why distributed AG is preferred to normal AG for cross datacenter failover scenario?

I have two node WSFC and currently I'm working on DR solution with availability group.I already read microsoft doc about distributed AG.So my question is what are benefits of using distributed AG ...
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1answer
78 views

Why do I need witness in WSFC with two nodes?

I have Windows Server 2019 and SQL Server 2019 running in both nodes of my cluster. In my case everything is working fine without witness. I need Windows Server Failover Clustering (WSFC) for ...
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1answer
16 views

Database Mirroring - Will forcing the service only lose non-committed data?

I have a database mirroring session in high safety mode between Server1 (Primary) and Server2 (Secondary) According to this, synchronous data mirroring means every transaction committed on the ...
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3answers
182 views

How to maintain a Database with stored procedure that runs forever?

I have an interesting question and I cannot find a reply. I would like to create a database of prime numbers. On this page Prime numbers in a given range , I can find various examples of SQL code ...
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1answer
64 views

MySQL database backup plan

I have a MySQL database that is about 17GB in size. Right now we don't have a backup for this and I have been tasked to look into backing it up automatically. I am a software developer myself, not an ...
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1answer
24 views

Disaster Recovery through cloning drives in sql server 2014 enterprise

I am a DBA noob and recently my work has considered to have a disaster recovery plan for their production DB lets say A (sql server 2014 enterprise). The production server A and Disaster recovery ...
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1answer
197 views

Is it safe to restart PostgreSQL if process terminated for some reason?

I am writing a docker-compose config with a container with PostgreSQL in it. docker-compose has a configuration options called restart. If I enable it then whenever the Postgres process stops it will ...
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1answer
42 views

Log Shipping between 2 AGs

I'm having one AG with two nodes (active-passive) in one data center and another AG with two nodes (active-passive) in a different data center. I need to have log shipping enabled between these two ...
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2answers
968 views

What is the best option for High availability on a data warehouse?

I have a customer who have an existing 1.5Tb data warehouse and are currently planning for a complete refresh of the DW on a new environment. Their infrastructure manager has organised 2 servers with ...
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2answers
236 views

Transaction Replication as DR solution

I have a production database server and a failover database server set up. All the transactions from the primary production db server is being replicated(transactional replication with initialize ...
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1answer
202 views

How to setup a SQL Cluster between 2 sites in active passive mode without shared storage

we need to install SQL at 2 sites, 1 primary and 1 DR. We don't to pay for license for the DR and need to know how will we setup a SQL cluster/replication/alwayson/bag or any other method that will ...
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1answer
177 views

Accidentally overwrote mysql database with empty data [closed]

I accidently imported an empty database backup file into the same database, using mysql-workbench. Is there any way to undo this and get the data back? The backup available is 4 months old which is ...
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1answer
87 views

What are the potential issues after data or log disk failure?

Scenario: A client recently had an issue with an Azure VM where the (non-OS) 'premium' storage disks were erroneous removed without warning by Microsoft. This is the virtual equivalent to the hard ...
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2answers
772 views

Always On Availability Group Failover Issue

I'm testing a PowerShell Disaster Recovery script and trying to fail over to an off-site AG DR (asynch) replica with this command ALTER AVAILABILITY GROUP [MyAG] FORCE_FAILOVER_ALLOW_DATA_LOSS On ...
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1answer
5k views

Restore mongoDB by --repair and WiredTiger

We accidentally deleted the directory rm -rf /data/db which was our MongoDB path, and thanks to extundelete, we recovered it and got the directory /data/db. Here are our files in the directory, and ...
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1answer
668 views

Recover a mongo database deleted by rm

My developer accidentally lost our database by a bash script, which turned out to run rm -rf /* (see this thread). Thanks to extundelete, he just recovered the /data/db/ folder: However, he could not ...
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2answers
129 views

I am trying to achieve a Disaster recovery for Mongo DB

Right now i have a MongoDb HA in site one and i need another site with asynchronous replication enables in another location.This is a base plan of mine to achieve a disaster recovery . I dont have ...
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1answer
205 views

Attach ldf more current than mdf

Is it possible to create a database where the ldf is more current then the mdf? Or to attach the older (more mature) ldf to the younger mdf (less mature)? I am working on Steve Stedman's Week 3 ...
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1answer
24 views

Domain Controller on Multi Subnet Always on Availability Group

This is will be my first big project. We have 4 Replica Always on availability group with 3 Replica on site and another replica offsite (different subnet) the File share witness will be placed on ...
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1answer
377 views

PostgreSQL ANALYZE execution time over 24h (still running)

I upgraded a Postgres DB 9.3.2-->10.5 using pg_upgrade (in place). I did everything according to the documentation and the instructions given by pg_upgrade. Everything went fine but then I realized ...
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1answer
112 views

Need help with SQL Server 2014 and disaster recovery

I am tasked with building a highly available SQL Server 2014 Enterprise environment for our new policy admin system. This database will eventually grow to 1TB +. Background Our normal method of ...
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1answer
61 views

Standard process during a disaster [closed]

In our environment we have a 2-node Failover cluster instance and log shipping for disaster recovery. Failover cluster is the primary site and log shipping is on DR. 2 node: same data center; log ship ...
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3answers
3k views

Is there a way to back up agent jobs?

I can't find documentation about whether agent jobs in SQL Server can be backed up. If not, how can I back them up in order to restore during the future recovery in case of an instance failure?
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1answer
798 views

Quorom Configuration for 3 Node Windows cluster

We have 2 node onsite and the 3rd node on DR and there is no disk witness. Due to maintenance I set the DR site to be primary and the other 2 nodes to be manual in asynchronous mode and after both ...
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1answer
996 views

Pausing the secondary Replicas for a day in always on availability group

We are planning to make the DR as primary and do maintenance on the secondary site(Formerly Primary Site) and hence pausing both the secondaries in always on availability group for a day. I am aware ...
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1answer
164 views

Problems of having DR as Synchronous Commit

In our always on set up we have One Primary and One Secondary as Synchronous Commit and the DR as asynchronous commit. If i want to change the DR to Synchronous Commit will there be any performance ...
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1answer
35 views

Failover from Primary to Asyn Secondary Replica

In my environment we have 1 Primary 1 Synchornous Secondary and 1 Asynchronous Secondary Replica (Off site). We are planning to do a manual failover to the Asynchronous Secondary Replica (Off site) ...
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1answer
713 views

MariaDB master-slave replication failover and failback

I'm trying to configure a DR instance of MariaDB (10.1.13) using master-slave replication. I was able to establish the master-slave relationship with GTID by locking the tables on master, backing up ...
0
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1answer
137 views

Recover Mysql data from formated hard disk [closed]

One of my machine got crashed last day and i ended up reinstalling windows on that machine. It had a mysql server in it. Is there a way to recover mysql data from that machine now . There are couple ...
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1answer
55 views

Restore MySQL tables with data folder only?

I have many MySQL databases with many tables and I’m trying to figure out if I can restore all of it only using the content of my MySQL data folder. Or should I just not bother and use the following ...
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1answer
986 views

Log Shipping Monitor Server Instance

We plan to incorporate Log Shipping for basic disaster recovery with reporting needs. Server A Source Database will log ship to Server B database. We will conduct log shipping every few hours. ...
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1answer
991 views

Log Shipping Backup and Destination Folder Location [closed]

We plan to incorporate Log Shipping for basic disaster recovery with reporting needs. Server A Source Database will log ship to Server B database. We will conduct log shipping every four hours. ...
3
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1answer
302 views

SQL Snapshot Redirect

Company is implementing Database Mirroring Asynchronous with Snapshot. This provides some Disaster Recovery with Reporting area. Server A Principal contains database which mirrors to Server B, ...
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1answer
386 views

SQL Mirroring Locking/Blocking Contention

We want to setup Mirroring High Performance Asynchronous. Server A Principal contains database which mirrors to ServerB. Mirroring does not allow read-queries unless snapshot is created. 1) If we ...
3
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1answer
4k views

Always On FCI vs Always On Availability Groups

What is the advantage of Always On Failover Clustering vs Always On Availability Groups? Basic Always On Failover Clustering provides server level protection, (eg: 2 servers with 1 shared disk space; ...
1
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1answer
216 views

Failover Cluster, Availability Group, and Disaster Recovery

We have an active/passive Windows Failover Cluster setup as an HA solution. Here is an example of what that might look like: Cluster1: [Node1 'active', Node2 'passive'] We're looking to set up a DR ...
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1answer
114 views

Can we reconstruct/reset a broken Postgresql data directory without losing data? [closed]

I'm trying to restore a database from a broken data directory that have lost many of its files accidentally. I have tried unsuccessfully to install new instance of the same Postgresql version and ...
0
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1answer
141 views

Can you implement DR in cloud using Async AG, logshipping with an on-premise FCI solution?

What are my options for building DR in cloud if I implement FCI for HA on-premise. The goal is to have a Hybrid on-premise HA + DR in cloud solution. Can I configure Async AG/logshipping in Azure ...
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2answers
65 views

all of the databases recovery models changed

i logged into a client's server today(which had log shipping for all of its db's), and found that someone changed all the databases recovery models to simple. so now i need to reconfigure the log ...
3
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1answer
768 views

Archivelog file deleted, resulting in 'ORA-01113: file 1 needs media recovery'

(This is not a production database. I'm practicing in a staging enviroment.) I'm trying to set up RMAN for backup/recovery. I did a full backup, which seems to be in a good state. I then did an ...
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1answer
78 views

Unistalled MySQL 5.6 and installed MySQL 5.7 - Restore Database and Tables

All of the data resides in "C:\ProgramData\MySQL\MySQL Server 5.6\data". There are 46 folders inside of this folder. There is one folder for every old database I had. For example the first three ...