Detecting VM Copied / Replicated
I am looking to detect any unique constraint if and when a VM image is copied from one location to another. I am actually doing this as a part of product licensing service modification to prevent...
View ArticleHyper V replication - vs - sql replication solutions
I need to establish an offsite copy of a number of production servers, including SQL server. Hyper V replication has been chosen as a simple solution (all servers are virtual). This is to supplement...
View ArticleMySQL Circular Replication
I have this scenario where I have 4 MySQL servers (A,B,C,D), as this: Server (A) is always online, and serves as the main website. Servers (B,C and D) are online on random periods of the day, and not...
View ArticleHigh 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...
View ArticleMongoDB 3.2.10 Index rebuilding did not complete: 11000 E11000 duplicate key...
MOngoDB 3.2.10 Getting following error when adding replica set as WiredTiger. This is sharded cluster ( 3 shards nodes ). 2 Shards replica sets created using wiredTiger storage so only 1 shard is...
View ArticleHow can I enable versioning?
I'd like to enable versioning for a replicated cache in a locally-running Infinispan server (8.2.4 final, two Infinispan servers form a cluster). This is documented in the user guide. Quote: 10.2.5....
View Articlelarge MYSQL DB single file
I have a large MYSQL innodb database (115GB) running on single file mode in MySQL server. I NEED to move this to file per table mode to allow me to optimize and reduce the overall DB size. Im looking...
View ArticleLarge MYSQL DB on single file
I have a large MYSQL innodb database (115GB) running on single file mode in MySQL server. I NEED to move this to file per table mode to allow me to optimize and reduce the overall DB size. Im looking...
View ArticleCassandra : data not replicated on new node
I added a new node to my cassandra cluster (the new node is not a seed node). I now have 3 nodes on my cluster : Status=Up/Down |/ State=Normal/Leaving/Joining/Moving -- Address Load Tokens Owns...
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Error 468 MS SQL Server : Couldn't resolve collation conflict between...
When I try to expand the list of local publications under Replication element in SQ Server Management Studio, I get the following error : Here is the detailed error log :...
View ArticleMysql high safety implementation (replication or separate writes or...
I want to implement highly safe system storage with mysql. My case is: I need to store records. For more safety i want to have N separate physical mysql nodes. Then client save record and get OK...
View Articlechanges on multimaster replication and activate GTID
I've been reading a lot about the changes I planned to do to our DB landscape but I need some confirmation or recommendation to be sure the work I'll do goes without causing a disaster. Here is what we...
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MySQL 5.1.66 SSL connection error ERROR 2026 (HY000)
UPDATE2 Using WireShark I found out the problem string (I hope I did): 28 | 9.582638 | 192.168.18.128 | 192.168.18.129 | MySQL Response Error 1043 And the error is (according to docs): Error: 1043...
View ArticleMySQL 5.6 replication causes 'waiting for table lock'
All of the sudden queries on slave server stopped with status "Waiting for table level lock" I restart mysql service and stop replications and locking does not show up anymore. Once I turn replications...
View ArticleReplication Issue - Changing the replication-do-db filter
I have a server that someone has setup which are acting as a master on both database. Since they have been configured as both master on the same database, changes one on end has caused all sorts of...
View ArticleHow to Upgrade Master Slave MySQL on AWS RDS?
I already have Master Slave configuration on AWS RDS. We want to upgrade 5.5 to 5.6.23. ..What should be correct sequence to Upgrade ? 1. Upgrade Master ( Using Modify Instance ) --> Upgrade Slave...
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Masters database not replicating on slave after restarting client
I'm trying to implement master slave replication and It's works fine with no errors, database is replicated on slave, but when I close my servers and open them again and add something in masters...
View ArticleSQL 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...
View ArticleMySQL Replication query - Primary key need
I have few doubts regarding MySQL replication (Master-Slave). Is it mandatory for a table to have primary query for replication to function properly? Referring this Percona link for the above question...
View ArticleMongo replicated shard member not able to recover, stuck in STARTUP2 mode
I have following setup for a sharded replica set in Amazon VPC: mongo1: 8G RAM Duo core (Primary) mongo2: 8G RAM Duo core (Secondary) mongo3: 4G RAM (Arbiter) Mongo1 is the primary member in the...
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