Database Mirroring Vs SQL Server FailOver (Performance)

Mar 15, 2006

Hi there.

I´m running some tests in a database with Mirroring and without Mirroring. As expected there is a performance hit using Database mirroring.

The tests i´m running are just simple functions inserting and updating the database, and then counting the number of sucedeed inserts and updates in a time interval.

My question here is: What if i use Sql Server failover mechanism?

I know that failover time will increase and management is more complex, but what can i expect in terms of performance ?





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Mirroring :: Manual Failover Did Not Get Back Database On Secondary Server?

Jun 22, 2015

I have SQL Server 2008 R2 database mirroring setup with witness. Below database connection string is used by the application
 
jdbc:sqlserver://<Server_A>MSSQLSERVER;databaseName=<Mirrored_DB>;port=1433;failoverPartner=<Server_B>MSSQLSERVER
 
During some maintenance activity at the OS side , I tried to manually failover database from Server_A to Server_B. It took long time for failover  to Server_B. While failing over the Mirrored_DB database goes in In Recovery status and application is not able to connect to database. I waited for long time more than 40 mins for database to come online on Server_B but it did not work.So I have recovered database on Server_B using RESTORE DATABASE Mirrored_DB WITH RECOVERY.
 
After database was recovered on Server_B application was not able to connect to database with error as "The database <Mirrored_DB> on server Server_BMSSQLSERVER is not configured for database mirroring".
 
My Question is

Why manual failover did not get back database on secondary server upwhy the original  connection string below is not able to connect to the database while database is online on Server_B  but without mirroring

 jdbc:sqlserver://<Server_A>MSSQLSERVER;databaseName=<Mirrored_DB>;port=1433;failoverPartner=<Server_B>MSSQLSERVER

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I'm looking at a setup where they have server1 and server2 in a mirroring relationship with automatic failover. 

Server1 is the principalThey are using transactional replication to replicate asingle databse to server3 is AWS.Distribution database is on Server1All Agents (log reader, snapshot, distributor) run on Server1Server2 has not been set up for replication...My understanding is that in this set up you would normallly place the distribution database on a separate server and enable publication on the mirror, Server2.

What happens if they failover? Replication would stop, and presumably records added while the mirror is the active database would not be marked for replication?How would they recover?  Failback and reinintialize

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Recovery :: Where To Place Witness Server For Mirroring Using High-safety And Auto-failover

Apr 9, 2015

We have 2 data centers, site 1 and site 2.  Site 1 is generally our primary, and site 2 is our Disaster Recovery (DR) site.  I want to setup a SQL instance to have extremely high availability.  Therefore I was looking at using DB mirroring, with synchronous data writing, high-safety and auto-failover.  This requires the usage of a witness server.My problem with this setup, is that if the witness and principal are both at site 1, if site 1 goes away (power failure, asteroid impact, lol, anything else that would be a *true* DR scenario), then there is no failover to the mirror server at site 2.   However, if you put the witness at site 2, anytime the WAN link between site 1 and site 2 has an issue, the DB will auto-failover to site 2.  Is the reason for the recommendation of the witness being at the primary site because the thinking is that WAN link failure is likely more common than a *true* DR scenario that takes out all of site 1?

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Database Mirroring | Can Witness Live On Mirroring Server?

May 3, 2008



Server A = primary SQL DBs (mirroring origination)
Server B = failover SQL DBs (mirroring destination)

For database mirroring a witness is required.
Can the witness live in another instance of SQL on server B?

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Mirroring Partial Failover

Nov 8, 2006

I'm testing mirroring in a high availability mode and getting some odd results. If I kill the SQL Service (or reboot the machine) fail-over works quickly and correctly. If I unplug the Network cable though I will get some of the databases failed over and some of the databases will either be Mirroring / In recovery or Principal / In recovery and never go live. Right clicking on them and going to properties lists there error that the database is unable to communicate with the Partner or Witness. The databases that this will occur on seem to move around (i.e. it isn't always the same databases, but will often be many of the same databases). If I reboot the databases that will not fail over tend to change fairly dramatically. I've seen instances where only 3 databases would fail over (I'm testing 17 databases) and other instances where all but 3 databases would fail over. I've had exactly one test where all databases failed over correctly. Again if I reboot a principal server, fail over works every time.



Has anyone else experienced only partial failovers for network issues or have a work around?

I have temporarily created a script that will force the databases to be the principal, but it's not great for high availability (probably will work for disaster recovery though).



Thanks



Larry

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SQL 2012 :: Mirroring Failover And Failback

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I have the following mirroing setup for DR.

Prinical(ServerA) and Mirror(ServerB)

When we do a DR test we do manual failover from Principal(ServerA) to Mirror(ServerB)

Now
ServerB is Prinicpal
ServerA is Mirror

Applications do their testing against the new principal which is ServerB but dont want to take those changes or sync to ServerA(Mirror).

Is there any way to do this without breaking the mirror?

Finally It will go back to original setup after the test which Server A is Principal and Server B will be its mirror.

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Feb 16, 2006

We are planning to update our two node, active/passive clustered system to SQL 2005 from SQL2K. Would we be better off to use database mirroring rather than clustering with failover? I believe mirroring takes 3 systems rather than two (one for each mirror and one for monitoring), but can the monitor be a rather low powered PC?

Our current cluster uses two 4-processor Dells and an external PowerVault RAID array with fiber channel connections. Each server has two NICs, one for general network and one for heartbeat and a fiber channel card to connect to the external PowerVault.

Here are my questions:

1 - If I understand it correctly, mirroring uses just separate servers without the need for the rather expensive and complicated shared fiber channel array that must go between them. Do I still need a shared array or can I just use internal RAID arrays in each box?

2 - Are there any advantages to keeping our current system? Our current system has worked well, but the failover takes a couple of minutes. Is mirroring faster?

3 - Is there still a virtual IP address and network name that everyone connects to?

4 - What are the drawbacks?

5 - Can I run non-mirrored DBs on the same servers or are they really locked together tightly?

6 - How much different in configuration can the two boxes be? With the cluster, I really need duplicates in every way.

7 - Do I need a separate license for the SQL Server on each box in the mirror or is one enough, since they work in lock step?

Thanks for any of your experiences on this.

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What would be best way to build high availability cluster for VDI? Also, since first option is very complicated.

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SQL Failover - Mirroring, Log Shipping, Clustering, Load Balancing

Jun 14, 2007



Hello.



I am confuse and cant decide on how to setup high availability on our SQL 2005. Here's what on my mind and on resources list:



I plan to have mirroring on my SQL1 to SQL2 with the help of SQL3 as witness. So this would be automatic failover. My idea on mirroring is when SQL1 goes down, SQL3 would tell SQL2 to run and be the primary. It will automatically failover to SQL2. Right? My questions are:

1) How can I revert back to SQL1 once it is ready?

2) I read in one of the post that it is impossible to write in a mirrored DB, is this true? I mean, what's the use of failing over to the next node when it's not possible to write and update data/records?

3) If number 2 is false (i hope so), how would the data be synchronize from SQL2 back to SQL1. Those transaction that were made while SQL1 is down.

4) How about the connection string from the web applications? Would it be automatically point to SQL2? We have load balancing setup in place, would this help web application connection to automatically point to SQL2?



Another setup:



We have SAN in place (not yet used, but is planning to use for this SQL thing), EMC to be specific. My question would be:

1) For SAN setup, the data storage would be centralize. So would that mean that SQL1 and SQL2 services will use the same data and log file from the SAN storage?

2) How would you call this setup then? Can this be clustering type of high availability? Will clustering work under load balancing setup? I believe mirroring is not possible here? Right?

3) How can I setup my 3 SQL servers with the same theory in mind: when SQL1 goes down, SQL2 will take over. Data will be synchronize when SQL1 is up and running again. With automatic failover and reverting back to primary.



I read so much topics about this, but the more I research, the more I get confuse.



Any suggestions, comments, advice is greatly appreciated!

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MSSQL Mirroring : Unable To Access Mirror After Succes Failover

Oct 16, 2007

Hello everybody,

I'am currently testing a MSSQL 2005 mirroring implementation with automatically failover.

1 principal server ====> Server A
1 mirror server ====> Server B
1 witness server ====> Server C

When server A fails Server B becomes Principal. ( which is the general idea ) This is working perfectly.

The problem is when i try to connect to the mirror Server B ( actually the new principal )

I use the .NET connection string with the failover parameter ( even without the parameter ) the connection fails.
( the general error : unable to connect, or connection property has not been initialized )

Data Source=ServerA; Failover Partner=ServerB;Initial Catalog=DBMTest;uid=dbuser;pwd=dbpassword;

This connection property works fine when server A (original principal) is online.

When i run the SQL profiler with the mirror db as profile, i dont see the traffic.

So you think the mirror server has a network problem or was not connfigured for remote access.
i thought that also, but when i create a 'stand alone - non mirrored' database the same application with the same connetion string ( well.....different db) works fine.

The problem must be in the whole mirroring implementation....... ( my idea )

Does anyone had the same problem, or better, doed anyone know how to solve it?

Hope to hear from you soon!

Thank you in advance!

Regards,
W.schmitt
The netherlands

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Not All Database Failover To Mirrored Database Server When MSSQL Service Stopped

Sep 4, 2007

We have a Prinicipal, a Mirror and a Witness server. We have automatic failover configured between the Prinicipal and Mirrored server. When we stop MMSQL service on Prinicipal, not all the databases failover to the Mirrored instance.
Any suggestions would be welcomed as we have a tight deadline to get this in Production.

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2. Assume I have always on cluster with three nodes, if primary fails, how second node make write/ read mode.
3. after fail over done to 2nd secondary node what mode in production(readonly or read write).
4. how to rollback to production primary ,will change data in secondary will get updated in primary.

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Why SQL Server 2005 Database Mirror Can't Failover?

Jun 28, 2006



Hello All,

I've tried to replicated exactly what it says in the online documentation. At the end of the post are the SQL statements issued.

1. Enable encrypted outbound connections on the primary server
2. Enable encrypted outbound connections on the mirror server
3. Enable encrypted outbound connections on the witness server
4. Enable encrypted inbound connections on the primary server
5. Enable encrypted inbound connections on the mirror server
6. Enable encrypted inbound connections on the witness server
7. Set mirror''s partner to the primary
8. Set primary''s partner the mirror
9. Set principal€™s witness.
Every step run''s normally,but why can''t auto failover.

I used the following Script:

/* -------- 1. ENABLE OUTBOUND CONNECTIONS ON THE PRIMARY -------- */
use master;
go
DROP USER PrincipalLogin1
DROP LOGIN PrincipalLogin1
DROP USER PrincipalLogin2
DROP LOGIN PrincipalLogin2
GO

Create login PrincipalLogin1
with password='PrincipalLogin'
go
Create user PrincipalLogin1
from login PrincipalLogin1
go

Grant connect on endpoint::Principal_Endpoint_Mirroring to PrincipalLogin1
go
---stop

create certificate MirrorCertForPartnerPub
authorization PrincipalLogin1
from file = 'd:BackupCertMirrorCertForPartner.cer';
go

Create login PrincipalLogin2
with password='PrincipalLogin'
go
Create user PrincipalLogin2
from login PrincipalLogin2
go

Grant connect on endpoint::Principal_Endpoint_Mirroring to PrincipalLogin2
go
create certificate WintnessCertForPartnerPub
authorization PrincipalLogin2
from file ='D:BackupCertCertForDBRole.cer'
GO



ALTER DATABASE Mirrortest
SET PARTNER = 'TCP://10.1.40.158:5022'
GO

ALTER DATABASE Mirrortest
SET witness = 'TCP://10.10.11.30:7000'
GO

select * from sys.certificates



/* -------- 2. ENABLE OUTBOUND CONNECTIONS ON THE MIRROR -------- */
--On Mirror
--Remove the database
--Connect to either partner.
--Issue the following Transact-SQL statement:

ALTER DATABASE Mirrortest SET PARTNER OFF

--Optionally, you can recover the former mirror database. On the server instance that was the mirror server, enter:

--RESTORE DATABASE Mirrortest WITH RECOVERY;

RESTORE DATABASE [Mirrortest] FROM
DISK = N'D:BackupCertMirrortest.bak'
WITH FILE = 1, NORECOVERY, NOUNLOAD, REPLACE, STATS = 10
GO
select * from sys.endpoints

drop endpoint Mirror_Endpoint_Mirroring

select * from sys.certificates


Create certificate MirrorCertForPartner
with subject ='this is the certificate for mirror',
start_date='06/25/2006'

backup certificate MirrorCertForPartner
to file='d:ackupcertMirrorCertForPartner.cer'



CREATE ENDPOINT Mirror_Endpoint_Mirroring
STATE=STARTED
AS TCP (LISTENER_PORT=5022)
FOR DATABASE_MIRRORING (
Authentication=Certificate MirrorCertForPartner
,ROLE=ALL)
GO

/* -------- 3. ENABLE OUTBOUND CONNECTIONS ON THE WINTESS -------- */

--On Witness

USE [master]
GO


select * from sys.certificates

drop certificate CertForDBRole
GO


create master key
encryption by password='asdf'

Create certificate CertForDBRole
with subject='this is a certificate for pricipal role',
start_date='06/25/2006'

backup certificate CertForDBrole
to file='c:CertForDBRole.cer'


select * from sys.endpoints

drop endpoint Witness_Endpoint_Mirroring


CREATE ENDPOINT Witness_Endpoint_Mirroring
STATE=STARTED
AS TCP (LISTENER_PORT=7000)
FOR DATABASE_MIRRORING (
Authentication=Certificate CertForDBRole
,ROLE=ALL)
GO


/* -------- 4. ENABLE INBOUND CONNECTIONS ON THE PRIMARY -------- */
use master;
go
DROP USER PrincipalLogin1
DROP LOGIN PrincipalLogin1
DROP USER PrincipalLogin2
DROP LOGIN PrincipalLogin2
GO

Create login PrincipalLogin1
with password='PrincipalLogin'
go
Create user PrincipalLogin1
from login PrincipalLogin1
go

Grant connect on endpoint::Principal_Endpoint_Mirroring to PrincipalLogin1
go
---stop

create certificate MirrorCertForPartnerPub
authorization PrincipalLogin1
from file = 'd:BackupCertMirrorCertForPartner.cer';
go

Create login PrincipalLogin2
with password='PrincipalLogin'
go
Create user PrincipalLogin2
from login PrincipalLogin2
go

Grant connect on endpoint::Principal_Endpoint_Mirroring to PrincipalLogin2
go
create certificate WintnessCertForPartnerPub
authorization PrincipalLogin2
from file ='D:BackupCertCertForDBRole.cer'
GO



ALTER DATABASE Mirrortest
SET PARTNER = 'TCP://10.1.40.158:5022'
GO

ALTER DATABASE Mirrortest
SET witness = 'TCP://10.10.11.30:7000'
GO

select * from sys.certificates


/* -------- 5. ENABLE INBOUND CONNECTIONS ON THE MIRROR -------- */
use master;
go
DROP USER MirrorLogin1
DROP LOGIN MirrorLogin1
DROP USER MirrorLogin2
DROP LOGIN MirrorLogin2
GO

Create login MirrorLogin1
with password='MirrorLogin'
go
Create user MirrorLogin1
from login MirrorLogin1
go

Grant connect on endpoint::Mirror_Endpoint_Mirroring to MirrorLogin1
go

--stop
create certificate PrincipalCertForPartnerPub
authorization MirrorLogin1
from file = 'd:BackupCertPrincipalCertForPartner.cer';
go

Create login MirrorLogin2
with password='MirrorLogin'
go
Create user MirrorLogin2
from login MirrorLogin2
go
create certificate WitnessCertForPartnerPub
authorization MirrorLogin2
from file ='D:BackupCertCertForDBRole.cer'
GO

Grant connect on endpoint::Mirror_Endpoint_Mirroring to MirrorLogin2
go


ALTER DATABASE Mirrortest
SET PARTNER = 'TCP://10.10.116.42:5022'
GO

ALTER DATABASE Mirrortest
SET WITNESS = 'TCP://w7mis02:5024'
GO




/* -------- 6. ENABLE INBOUND CONNECTIONS ON THE WITNESS -------- */

use master;
go
DROP USER WitnessLogin1
drop login WitnessLogin1
DROP USER WitnessLogin2
drop login WitnessLogin2

Create login WitnessLogin1
with password='WitnessLogi*n@'
go
create user WitnessLogin1
from login WitnessLogin1
go

create certificate PrincipalCertForPartnerPub
authorization WitnessLogin1
from file = 'c:ackupcertPrincipalCertForPartner.cer';
go
--***************************************
Create login WitnessLogin2
with password='WitnessLogi*n@'
go
create user WitnessLogin2
from login WitnessLogin2
go

create certificate MirrorCertForPartnerPub
authorization WitnessLogin2
from file = 'c:ackupcertMirrorCertForPartner.cer';
go

Grant connect on endpoint::Witness_Endpoint_Mirroring to WitnessLogin1
go
Grant connect on endpoint::Witness_Endpoint_Mirroring to WitnessLogin2
go

All runs normally,But how can't be auto failover?

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It has been in this state for more than 45 mins now. The last_sent_time, last_received_time, last_hardened_time and last-redone_time are all stuck with a time stamp 45 mins ago.

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I need to migrate my SQL server Mirror Database to a new server. my current setup is as below

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2. server B Mirror     (192.168.1.200)

Now i have a new server (Server C) to replace server B as below

1. server A principal (192.168.1.100)

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note: SQL SERVER 2008R2 EE(64BIT), Win2008R2 EE 64bit.

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Oct 24, 2007


Dear,

Are possible build a solution with SQL Server 2005 Cluster and Database Mirroring? I have the following scenario:

1) Site A
SQL Server 2005 with 2 nodes and active/passive

2) Site B
SQL Server 2005 for Disater Recovery with Log Shipping.

Are possivel change Log Shipping by the Database Mirroring? If is possible, are better:


a) Synchronous(with or without witness)
b) Asynchronous

Thanks a lot! Sandro.

sgpcosta@hotmail.com

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Sep 27, 2006

Hi All,

I get a general question about the feacture "Database Mirroring". Is it support by SQL Server Standard. Edition without SP1?? Of i still need to upgrade the server from SQL Server 2005 to SQL Server 2005 with SP1?

Another question: are there any problem if the one machine(server) has installed SQL server 2005 Standard edition and the other with "Developer Editon".

I hope some one can answer my question. Thanks anyway!

Regards,

Pat

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I have setup database mirroring with witness server. To prevent unnecessary failover because of network slow or other issue, I changed the timeout setting as

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SET PARTNER TIMEOUT 120

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If this is true, it does not happen in my case. Failover happens before120 second.

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I am trying to enable database mirroring for 100 database.
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it gave the status (principal, disconnected). Also mirror starts acting
abnormal. connection to mirror starts to give connection timeout and it is
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this are my test servers... i have more than 500 databases on my production
servers.

principal and mirror both are using port 5022 for ENDPOINT communication.

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Dear All,



I have a download "SQL Server 2005 Evalution Copy". I installed it to 3 machine, 1 - XP Professional (Witness) and 2 - Windows Server 2000 (Principle and Mirror) . And I want to try Database mirroring.



However, after restore the Log into mirror server I try to execute the following statement in Principle Server:

ALTER DATABASE TestDB
SET PARTNER=N'TCP://[10.0.200.2]:5022'
GO

The above 10.0.200.2 is the mirror server IP address.

it show error message as:

Msg 1416, Level 16, State 31, Line 1
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In Miorror Server

I execute the statement :

ALTER DATABASE TestDB
SET PARTNER=N'TCP://[10.0.200.1]:5022'
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It shows sucess



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it show error message as:

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I am trying to enable database mirroring for 100 database.
It goes error free till 59 databases (some times 60 databases) with the
status (principal, synchronized) on principal. on the 60th or 61st database
it gave the status (principal, disconnected). Also mirror starts acting
abnormal. connection to mirror starts to give connection timeout and it is
not enabling database mirroring on any more databases. I have SQL SERVER
2005 Enterprise with SP1 on the servers. witness is not included yet.

these are my test servers... i have more than 500 databases on my production
servers.

principal and mirror both are using port 5022 for ENDPOINT communication.

All of the databases are critical and all must be included in the Database Mirroring.
so, after that I tried to implement database mirroring again......
System has 3 GB of RAM, SQL SERVER (Mirror) using 85 MB of RAM but still
giving this error while trying to enable database mirroring for 37th
Database.....

"There is insufficient system Memory to run this query"

WHY?

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Hi!

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Microsoft SQL Native Client error '80004005'

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May 9, 2015

I configured a database mirroring on SQL server 2008 R2 on test environment. However It was not working, after some time. I deleted the mirroring configuration and also deleted database on both primary and mirror instance.

few days later I notices, On Primary, Continuous error events logged with message "database mirroring attempt by user 'domainservice account' failed with error 'connection handshake failed, 'domainservice account' does not have permission on the endpoint state 84.

I want to get rid of this message.

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SQL Server Admin 2014 :: Database Mirroring For Large Number Of Databases

Oct 27, 2015

I have a 2 node cluster having 4 cores each wherein having 3 instances of SQL 2008 R2 enterprise comprising of 60 databases, 20 on each instance. I need to setup mirroring for each of the databases to a secondary server having 4 cores and 3 instances. What i understand is that in this case the mirror server will be providing max of 512 worker threads and the 60 mirror databases would consume 240 threads.what all needs to be checked for looking into the feasabilty of going ahead with a async mirror setup as mentioned above.

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The SQL Server Service Broker Or Database Mirroring Transport Is Disabled Or Not Configured

Jul 13, 2007

Hi,



I received an alert 'The SQL Server Service Broker or Database Mirroring transport is disabled or not configured'



How can I check the status of the two? and if they are disabled how do I enable them?

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Article: Database Mirroring Not Ready For Production When SQL Server 2005 Ships

Sep 16, 2005

Can someone at Microsoft comment on this article, specifically, how it relates to SQL Replication?  Will SQL Replication fall into the category of what this article describes, or only the mirroring feature?

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