Terracotta DSO works by manipulating the byte code of your classes (and the JDK’s classes etc). The instructions on how and when to do this are part of the Terracotta configuration file. The bytecode modification looks for certain byte codes such as a field read or write or a monitor enter or exit. Whenever those … Read more
Brute force approach: Send it the “.dump” command to create a text representation of the data. Read that data in into the second database. Not sure you can use that. If you need a fine grained update (sending a copy of each upto the other copy), have a look at sqlite3_update_hook But how do you … Read more
I created a spreadsheet to better illustrate the effect of Arbiter nodes in a Replica Set. It basically comes down to these points: With an RS of 2 data nodes, losing 1 server brings you below your voting minimum (which is “greater than N/2”). An arbiter solves this. With an RS of even numbered data … Read more
I believe so. After replication is working, you can drop the indexes on the slave and create the indexes you want and that should do it. Since MySQL replicates statements and not data (at least by default), as long as the SQL necessary to insert or update or select from the table doesn’t need to … Read more
When I had this problem, my database didn’t have an owner set properly. I had restored a database from another windows domain, right clicked the database -> properties and verified in the “general” tab that the owner was set correctly. However, in the “files” tab, owner was not set at all. As soon as I … Read more
Yes: SELECT * FROM sys.tables WHERE is_replicated = 1 From MSDN for is_replicated field: 1 = Table is published using snapshot replication or transactional replication.
Consistency in the sense it is used in ACID means that all constraints are satisfied before and after any change. When a system assures that you can’t read data that is inconsistent, they’re saying for example that you will never read data where a child row references a non-existent parent row, or where half of … Read more
Add “?connect=replicaSet” to the end of your connection string if connecting to MongoLab. new MongoClient(“mongodb://username:[email protected]:11111/db-name?connect=replicaSet”) This JIRA ticket has some details: https://jira.mongodb.org/browse/CSHARP-1160 Basically the default is to connect to a replica set member. But MongoLab’s Single-Node settings are actually a single node replica set and this causes us to not trust it. Appending ?connect=replicaSet to … Read more
The basic problem we are trying to solve is this: Can a situation occur in which a read doesn’t return the most up-to-date value? Obviously, this is best avoided if possible! If R+W <= N, then this situation can occur. A write could send a new value to one group of nodes, while a subsequent … Read more
If you are testing things, the easiest way would be kubectl delete deployment –all Althougth if you are using minikube, the easiest would probably be delete the machine and start again with a fresh node minikube delete minikube start If we are talking about a production cluster, Kubernetes has a built-in feature to drain a … Read more