replication

问题 I am running a production mongodb replication with version 2.6 now. Today I found out that the primary mongod instance keeps writing log: [conn557392] killcursors: found 0 of 1 And I checked the db.serverStatus().metrics.cursor, there are indeed a great amount of timedout cursor as mentioned in this discussion. My questions are Because I set all my read logic as Secondary preferred, the primary suppose to be write only. Why it needs to kill the cursor? The cursor suppose to be only for read?

问题 I am new to Cassandra was going though this Article explaining sharding and replication and I am stuck at a point that is - I have a cluster with 6 Cassandra nodes configured at my local machine. I create a new keyspace "TestKeySpace" with replication factor as 6 and a table in keyspace "employee" and primary key is auto-increment-number named RID. I am not able to understand how this data will be partitioned and replicated. What I want to know is since I am keeping my replication factor to

问题 We have a geo-replicated database in SQL Azure (Premium) and are wondering if we are pointing to the South Central US database that is the master, if that goes down do we have to manually change our connection strings in our code (C# .Net / Entity Framework 6) to point to the new database in say North US? We are looking for a way to have a single connection string and then Azure do the under the covers to now point to the new database if the master ever goes down. Is that possible? Update on

问题 I have a server, with a couchdb database that contains information my application needs. It contains a couple megabytes of stuff, a few documents which change on a day-to-day basis (adding latest news, deleting old documents, updating a few). The application syncs with the servers database when it can (to have this information available offline). However, this information is global to every user of my application -- so by necessity needs to be restricted to strictly read-only access. However,

问题 I want to replicate some of data that exists in my database. I want to replicate specified data. Is there a solution? 回答1: USe Replication Row Filters: Using static row filters , you can choose a subset of rows to be published. All Subscribers to a filtered publication receive the same subset of rows for the filtered table alt text http://i.msdn.microsoft.com/ms151775.e4e1c995-fe81-4c05-b661-39087b323161(en-us,SQL.100).gif See also: How to: Define and Modify a Static Row Filter (SQL Server

问题 I want to replicate some of data that exists in my database. I want to replicate specified data. Is there a solution? 回答1: USe Replication Row Filters: Using static row filters , you can choose a subset of rows to be published. All Subscribers to a filtered publication receive the same subset of rows for the filtered table alt text http://i.msdn.microsoft.com/ms151775.e4e1c995-fe81-4c05-b661-39087b323161(en-us,SQL.100).gif See also: How to: Define and Modify a Static Row Filter (SQL Server

问题 What is deference between Microsoft Sync Framework and Replication? which one is better? 回答1: Sync Framework is a programming framework. You still have to program it yourself. Replication is an end to end feature. Replication solves changes in schemas too (I believe Sync Framework deals with synchronizing data, not schemas) Replication has many more enterprise features already resolved. Sync Framework can be used for not only databases, but anything with a sync provider (replication is only

问题 I am working on an application that runs on multiple clients that talk to one main MySQL database. Additionally, we have a web application that uses the same MySQL database. Due to latency issues, all clients will have to run their own local MySQL database which should be a copy of the main MySQL database. The web application remains to use the main MySQL database. The clients only read from table A, and write to table B. The web application writes both to tables A and B. How should I setup a

问题 I'm aware that on hazelcast editions comparison page: https://hazelcast.com/pricing/ it is clearly specified that WAN replication is only for enterprise edition. But, on the other hand, this hazelcast documentation is divided into two parts: https://docs.hazelcast.org/docs/latest/manual/html-single/#wan Only the second part is explicit about enterprise edition, making one assume that the first part refers to non enterprise edition. I also noticed that the parameters are a bit diferent between

问题 I'm aware that on hazelcast editions comparison page: https://hazelcast.com/pricing/ it is clearly specified that WAN replication is only for enterprise edition. But, on the other hand, this hazelcast documentation is divided into two parts: https://docs.hazelcast.org/docs/latest/manual/html-single/#wan Only the second part is explicit about enterprise edition, making one assume that the first part refers to non enterprise edition. I also noticed that the parameters are a bit diferent between