replication

问题 here is the problem: 2 MySQL 5.5 servers Row based replications + master master Writes are on both servers (both active) autoinc trick (1 server odd, the other one even) I have a table like byUserDailyStatistics: id (PK + AUTO INC) date idUser metric1 metric2 UNIQUE(idUser, date) All requests are INSERT INTO byEmailDailyStatistics (date, idUser, metric1, metric2) VALUES (:date, :user:, 1, 1) ON DUPLICATE KEY UPDATE metric1 = metric1 + 1, metric2 = metric2 +1 And sometimes, the replication

问题 I have a glusterfs setup with two nodes (Node1 and Node2). I see connection has made between two connection. Problem is when I create some folders on Node1 it does not replicate it on Node2. Please suggest me to overcome if any one had fixed it? If I mount it on some other server as glusterfs client and create files and folders then its replicating to glusterfs nodes. Is this behavior normal? Volume Name: testvol Type: Replicate Status: Started Number of Bricks: 2 Transport-type: tcp Bricks:

问题 Lets say I've created a keyspace and table: CREATE KEYSPACE IF NOT EXISTS keyspace_rep_0 WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 0}; CREATE TABLE IF NOT EXISTS some_table ( some_key ascii, some_data ascii, PRIMARY KEY (some_key) ); I don't want any replica of this data. I can insert into this table with consistency level ANY . But I couldn't select any data from this table. I got the following errors when querying with consistency levels ANY and ONE , respectively

问题 I have stumbled upon an interesting MySQL Error message that I do not really know how to interpret. The setup: There are two tables A and B. When data is written or updated in the table A, then a trigger is writing data to the table B. Operations happen on a Master database Data is replicated to a slave server Now, whenever I decide to update data in table A, then it is updated and the corresponding log message is written to table B. MySQL, however, spawns the following error message: Note:

问题 In the master/slave database replication, all writes go to the master machine. All reads go to the slave machine. The master machine replicates data to the slave. When the master replicates data to the slave, the slave machine has to do a write which would lock up the row. Reading from the slave machine is faster but why? 回答1: The Master is very busy It writes data in parallel (that's obvious) It incurs disk I/O writing to binary logs, serializing the collection of completed SQL into its

问题 The following is part of my config for using a single slave. <default_read> <connection> <use/> <host><![CDATA[slavedb1.amazonaws.com]]></host> <username><![CDATA[username]]></username> <password><![CDATA[Password]]></password> <dbname><![CDATA[shop]]></dbname> <initStatements><![CDATA[SET NAMES utf8]]></initStatements> <model><![CDATA[mysql4]]></model> <type><![CDATA[pdo_mysql]]></type> <pdoType><![CDATA[]]></pdoType> <active>1</active> </connection> </default_read> However, I want to use

问题 I just did the mongodb replica set configuration and all looks good. All data moved to secondary nodes properly. But when I looked at the data directory, I can see Primary have ~140G of data and at the same time secondary has only ~110G. Did anyone come across this kind of issue while setting up the Replica Set. Is that something normal behavior? 回答1: When you do an initial sync from scratch on a secondary, it writes all the data fresh. This removes padding, empty space (deleted data) etc. As

问题 I have a web application that uses two databases. DB1 Users perform their CRUD (Create, Read, Update, Delete) operations. Database DB2 is a readonly database on a different server that i use for reporting purposes. Every hour my DB1 saves transaction logs and on DB2 i have a job that restores them on that DB2 to keep it ~up to date. Problem i am facing is that if there are users running reports on DB2 (happens quite often) they get disconnected from the sql server as i obtain exclusive access

问题 I have a 3 node Cassandra cluster with replication factor of 2. Because one of the nodes has been replaced with a new one. And I have used "nodetool repair" to repair all the keyspaces. But don't know how to verify that all the keyspaces are synced. Before, Just found this article would help, but a little. Cassandra Data Replication problem Is there any way to verify the keyspaces with replication factor > 1 in Cassandra? Thanks a lot. stephon 回答1: First, if you run nodetool repair again and

问题 I have the following topology. One Ubuntu 16.04. Instance on the Amazon AWS where my global MySQL Server is running. I want to use this Server as a Slave (Multi-Source Replication) for many local Master (Windows Machines MySQL Server). For Testing Reasons I`ve Managed to make this running on one local Machine (with three different MySQL Server Running). But now I want to make this Replication work on the mentioned global Server with the local ones. But it fails on the attempt to connect from