Browsing articles in "HA features in SQL"
Oct
3
2017

Windows Cluster Asymmetric Disks – In Always ON Clusters

Starting Windows 2012, Windows cluster supports asymmetric disks which is required for Cluster participating in Always ON technology hence is a useful concept to be aware of,   http://www.sqlserverfaq.net/2012/09/16/when-do-we-need-asymmetric-storage-with-alwayson-fci-and-availability-storage/   https://social.technet.microsoft.com/Forums/windows/en-US/493bf438-eb9d-405c-81c5-42aaa31eef8a/configure-asymmetric-storage-for-crosssite-windows-failover-cluster?forum=winserverClustering  

Jul
15
2016

Transaction log file full because of log_reuse_wait_desc=replication, CDC, goldengate

Came across weird situation where received alert for SQL Server transaction log file full and found log_reuse_wait_desc=replication from sys.databases   Now before mentioning troubleshooting step, setup of the database is question is little bit complex because Database is part of SQL Server replication where database publisher is at vendor side and we don’t have access to publisher DB 🙁 Oracle Golden Gate replication is configured from this database to Oracle DB Database in question is […]

Feb
15
2013

The command failed because the database mirror is busy. Reissue the command later.

Issue: Trying to turn of database mirroring, disconnected mirroring from Principal database but when checked the partner Database, found that database still in restoring mode, when trying to delete it, it failed stating database is part of mirroring as below,     Then ran following command/s which resulted in error, ALTER DATABASE [STASxref] SET PARTNER OFF; ALTER DATABASE [STASxref] SET PARTNER FORCE_SERVICE_ALLOW_DATA_LOSS;   Msg 1404, Level 16, State 11, Line 1 The command failed because […]

Jan
15
2013

[sqsrvres] CheckQueryProcessorAlive: sqlexecdirect failed

Found SQL Server 2005 SP4 CU3 A/P failover cluster SQL services are stopping and starting several times in interval of 30mins to 1 hour. Following errors are found,   Application Log Errors: [sqsrvres] printODBCError: sqlstate = 08S01; native error = 0; message = [Microsoft][SQL Native Client]Communication link failure [sqsrvres] CheckQueryProcessorAlive: sqlexecdirect failed [sqsrvres] OnlineThread: QP is not online. [sqsrvres] printODBCError: sqlstate = 08S01; native error = 2746; message = [Microsoft][SQL Native Client]Communication link failure [sqsrvres] […]

Jan
14
2013

How to drop Publisher database in Transactional Replication

Dropping publisher database may be required in various scenarios; please find steps which can help you to drop in case you are facing issues with it. I am including roll back approach as well, it helps sometimes.   First step -> Drop Publication and subscription Second Step -> Drop Database   First step, Right click Publication > Generate Scripts > Generate Drop replication and objects script > Save script to local drive Right click Publication […]

Jan
14
2013

Restore Publisher Database which is part of Transactional Replication

Today I have to restore a publisher database from production backup in QA environment which is part of transactional replication in SQL Server 2005, now there are multiple ways to do it, visit this link for Microsoft recommendation. My approach was, Stop and remove replication, restore database, recreate replication without reinitializing   Before beginning ensure that there is no pending distributed items by going to replication monitor > publication > double click the subscription > […]

Jan
14
2013

SQL SERVER 2005 Resource Fails to come online on cluster after SQL Resource removed and re-added in cluster group

In my case System admin accidently deleted SQL Server 2005 SQL Service resource from SQL cluster group (when trying to remove a disk from cluster) and re-added again but after re-adding SQL server failed to come up and following error noted in SQL Error log, ———– Error: 26054, Severity: 16, State: 1. Could not find any IP address that this SQL Server instance depends upon. Make sure that the cluster service is running, that the […]

Dec
27
2012

Size of Transaction Log Increasing and cannot be truncated or Shrinked, log_reuse_wait_desc = replication

Today while troubleshooting log full issue, came across following scenario where two sql servers are in different domain and both are part of simple transactional replication where log file full was on subscriber, after investigation found that replication is working fine and no transaction are in undistributed state still log file is not shrinking, we tried changing recovery model to simple, etc but still issue didn’t get resolved. Finally we manually executed script to mark […]

Apr
8
2012

SQL Server 2000 Replication and Agents

General Replication concept and guide to set Up Snapshot Replication http://www.databasejournal.com/features/mssql/article.php/1458491/Setting-Up-Snapshot-Replication-A-Step-by-step-Guide.htm This article talks about general concept of replication, various topologies and also a guide to setup snapshot replication

Apr
8
2012

Replication failure: Unable to start a DCOM Server

Error: Unable to start a DCOM Server: {08B0B2D9-3FB3-11D3-A4DE-00C04F610189}. The error: “The system cannot find the path specified. ” Happened while starting this command: C:\PROGRA~1\MICROS~3\80\COM\snapshot.exe -Embedding

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