Can refer to disks in a RAID-1 configuration, or low-latency database replication strategies.

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17 views

Replication of a remote MySQL database to local MySQL database

I'm the developer of my employers corporate private website, a HTML5/PHP/CSS powered site for company reports etc. The site, hosted on a shared hosting package, connects to a remote read-only MySQL DB ...
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1answer
134 views

Snapshotting Database Tables

I have a reporting database (in SQL Server) that takes nightly snapshots of the production data (Oracle) for users to query against for the next day, but now the requirement is getting to be that they ...
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1answer
256 views

Troubleshooting Mirroring Configuration

I am configuring database mirroring on SQL Server 2012. After configuration I am getting the following error when attempting to start the mirroring session: tcp server cannot be reached or does ...
4
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2answers
78 views

Impact of deleting 100GB table on Mirroring

I'm about to delete a large table which is approximately 100GB in size. I'd like to understand the impact on the mirroring that's in place on this db. Can anyone confirm?
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1answer
236 views

Mirror failure after windows updates - possible cause?

Over a dozen SQL Server mirrors had windows updates installed this morning - 2 of which developed serious faults afterwards. The windows updates installed where: KB2939576 KB2957189 KB2957509 ...
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1answer
62 views

Database Mirroring and Replication in SQL Server 2008 R2

I have configured the mirroring and replication between 4 servers (A,B,C,D).i.e, Mirroring between A to B and C to D, Replication between A and C. The configuration was a success and I am able test ...
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1answer
27 views

Failover Mirror

My name is Jackson and I'm from Brazil, sorry about my English. My question is about the failover process in SQL Server Mirror. Question: If just the database, not a instance or a server, goes ...
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0answers
29 views

What happens if SQL Server mirroring fails over and during synchronisation?

I have two sql boxes, one primary and one mirror. The mirror stopped synchronising last night for about 12 hours and so now the primary is transferring about 25GB of logs that built up. However ...
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0answers
20 views

Any way of checking mirroring monitoring whilst the primary is unavailable?

I have two sql boxes, one primary and one mirror. The mirror stopped synchronising last night for about 12 hours and so now the primary is transferring about 25GB of logs that built up. It's now ...
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0answers
61 views

Transaction log backups during index maintenance

We have a database with large and complex files and fragmented indexes. The environment is SQL 2008 Full recovery model and Mirrored which limits me to reorganizing. The backup strategy is Full ...
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0answers
42 views

Mirror database on same server instance for better read performance?

I am developing a somewhat big web application, which uses data which is aggregated using a crawler. The crawler is constantly writing to the database and updates many tables at the same time. For the ...
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0answers
28 views

SQL Server: mirroring several tables in different databases

I want to keep several tables in two different databases mirrored. Both databases are within the same server, and both are SQL Server dbs. This mirroring only affects the data they contain, not the ...
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1answer
32 views

Can't set up mirroring for a specific database

We have several databases. All of them are mirrored. Until now, we never had issues with this. One database had some problems, and now when we try to enable mirror again, it just stops. Message in ...
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2answers
370 views

Ola Hallengren with database mirroring

I am about to setup Ola Hallengrens database maintenance plan. We have our database mirrored and I was just wanting to know if I need to run the script on both my Sql Server instances or only the ...
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2answers
4k 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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0answers
101 views

SQL Server Mirroring send/receive ack time not normal

I have a problem that arises during the performance test by microsoft team in my client. The report that is given to us provide information about whether or not a parameter is good based on the Object ...
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1answer
84 views

ERP (Oracle) real time backup [closed]

I work in a small company, that runs an ERP that holds about 600MB of data. My task at hand is, to find a way to always have real time backup of the erp (Oracle 11g) that can be retrieved easily (so ...
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0answers
29 views

Data mirroring suggestions

On my test environment, I have a SQL 2012 2-node physical cluster that accesses a common iSCSI storage on a separate Windows Server 2012 box. What options are there if I want to backup this storage to ...
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2answers
2k views

Reconnect mirroring server SQL2008 R2

The failover server has status (Mirror, Disconnected, In recovery) and principal server has status (Principal, Disconnected). What is the process to reconnect these servers?
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1answer
3k views

Mirroring - Server network address cannot be reached

I have SQL Server 2008 R2 Installed. It contains three instances. Default (MSSQLServer) FirstInstance SecondInstance All these are Log On as Network Service.. Default Instance is Principa ...
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1answer
114 views

Database failover/failback history

I am a SQL DBA newbie, and I am trying to get the failover/failback history for one of our mirrored servers. I am able to get the the failover history from event viewer but do not know how to the get ...
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1answer
249 views

How to execute some script when database starts up

I want to execute some T-sql code, when a database starts up. the objective is to resume a session of mirroring in case the session is "suspended" when the database comes "back to life". So I've ...
2
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0answers
464 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 ...
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1answer
257 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 ...
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2answers
436 views

Upgrading Instances with Mirroring

If you want to upgrade or install a patch on two separate instances that house both the principal and mirrored database, how can you go about that? If the database that is being mirrored needs to be ...
0
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1answer
123 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 ...
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2answers
159 views

Update primary SQL Server in mirrored environment using transaction logs from old environment

I'm currently migrating a large (~40gb) database to a new environment. The new environment is a HA/mirrored set up with primary, mirror and witness nodes. I'm backing up the database in the old ...
2
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0answers
486 views

Failover only working for Classic ASP, not ASP.net [closed]

Setup: All machines run Windows Server 2008 Enterprise SQL Server 2012 Standard (Primary) SQL Server 2012 Standard (Mirror) SQL Server 2012 Express (Witness) Root issue: Our ASP.NET application is ...
5
votes
3answers
730 views

How to reduce network latency during mirroring?

We are using SQL Server 2008 R2 Standard edition for mirroring. But we found out that network latency is too high. It takes nearly four times time to complete a transaction while mirroring is active. ...
5
votes
1answer
2k views

How do I shrink the physical Transaction Log file when it's the principal in a mirror?

We setup database mirroring over the weekend, and forgot to re-enable the job that backs up the transaction logs. When I came in this morning, the transaction log had ballooned to 58GB, and was taking ...
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4answers
1k views

Cannot remove Mirroring / nor restore or delete database:Error 3456 (SQL Server 2012)

I have a database that was a mirrored partner and went into suspended state. (Mirror Server was shut down). I took the principal database out of mirroring using SSMS. But now I am unable to restore ...
0
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2answers
118 views

Can I use replication/mirroring to have a “Current” database and a “Full History” copy?

I have a database that is used for current operations. The amount of data is starting to get a bit to much for the applications using it. Most of the data is older and is very rarely needed. I am ...
1
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1answer
166 views

Can I run a Report Server and a Mirror server from a working Log Shipping secondary instance? [closed]

Our setup: City A - Primary server for logshipping City B - Secondary server for logshipping Now there is a lot of data being updated from A - B. And the server in City B is underutilized, and it ...
4
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2answers
678 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 ...
2
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1answer
626 views

Should I use Asynchronous Mirroring?

I plan on setting up mirroring on a SQL 2012 database which is currently in production. My concern though is how much it will affect the performance of the principal database. I am using mirroring ...
0
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1answer
77 views

SQL Server 2008 Mirroring

How would one start the secondary mirror instance if the principal SQL server instance went off line?
3
votes
1answer
559 views

Best Approach for Mirroring Data from SQL Server to MySQL

I need help in regards to replicating data from a third party point-of-sale system with a SQL Server backend to a MySQL DB. Specifically, can anyone suggest a best way to mirror data from SQL ...
10
votes
3answers
7k views

What can cause a mirroring session to timeout then failover? SQL Server 2005

We have two production SQL Servers running SQL Server 2005 SP4 with cumulative update 3. Both servers run on physical machines that are identical. DELL PowerEdge R815 with 4 x 12 core CPUs and 512GB ...
3
votes
1answer
256 views

Transactional versus Merge Replication (Restore backup after downtime)

I have the following transactional replication setup: Windows Server 2008 with SQL Server 2008 Enterprise Server A: Master, has a database with a table, publisher Server B: Slave, subscriber ...
8
votes
2answers
352 views

Mirror log empty on primary but fine on the mirror

We have dozens of principle servers and corresponding mirrors, most are working fine, however, 1 of them is acting strange. Specifically, the sp_dbmmonitorresults proc returns all columns as NULL for ...
2
votes
3answers
3k views

How to Setup SQL Server 2008 R2 Mirror

I am trying to set up SQL Server 2008 R2 mirroring but I am getting stuck with this error: An error occurred while starting mirroring. Additional Information: Alter failed for Database ...
0
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1answer
139 views

SQL Server Mirror failover on failing storage

Recently we had an issue with a sql server 2008 r2 HA mirror. I have tried to reproduce this in a lab environment and i came to the conclusion that i am missing something OR something is not possible. ...
1
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1answer
214 views

How to test mirroring with a single Microsoft SQL Server license?

I want to test mirroring in Microsoft SQL Server Enterprise in order to decide if I would implement one in production. Buying another copy of SQL Server for another machine is not an alternative, ...
0
votes
1answer
626 views

Resuming Replication w/ Database Mirroring when Principle is unavailable

I'm trying to setup a disaster recovery scenario and I'm stuck at this particular point. Here's what I've done so far: A) Created principal database on Server A and and mirror on Server B ...
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3answers
3k views

Why are my SQL Server 2008R2 databases not mirroring?

I'm trying to set up database mirroring in SQL Server 2008R2. I've taken a full backup and a transactional backup from my principal database and I've restored both WITH NORECOVERY. However, my mirror ...
2
votes
3answers
813 views

Mirroring Databases in MySQL

Is there a way to mirror databases in MySQL? In SQL Server, you have the ability to link 2 databases in a master to master relationship. One DB will accept transactions and the transactions will be ...
3
votes
1answer
341 views

Transaction log growing on a mirrored principal

I have a pair of SQL Server 2008 R2 servers hosting a synchronously mirrored database with no witness. This weekend, we had to do some network maintenance so I paused the mirroring. Upon resuming, the ...
5
votes
1answer
1k views

SQL Server ODBC Mirror/Failover Partner

Background/Context We are in the process of moving our SQL Server 2000 databases to a mirrored SQL Server 2008 R2 server with a witness and automatic failover. We have both .Net and Access ...
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1answer
467 views

Replicate/Mirror SQL Server schema to slave databases

I have a empty database called MASTERDB and around 10, or more, slave databases that are copies of the MASTERDB database. MASTERDB will be always empty, as I only need the schema. No data is going to ...
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1answer
113 views

Rolling changes to production databases

We're currently using Clustering to do fail over for our SQL environment. There are two servers that use the same shared drive. The SQL database is on a shared drive. This provides OS and hardware ...