replication

问题 I encountered the following warning after converting a mongodb replica set to a stand alone server. I did rs.remove('host') and removed the replSet arguments when starting the mongo db. [root@sam ~]# mongo MongoDB shell version: 2.4.3 connecting to: test Server has startup warnings: Tue Jul 9 17:18:46.076 [initandlisten] Tue Jul 9 17:18:46.076 [initandlisten] ** WARNING: mongod started without --replSet yet 1 documents are present in local.system.replset Tue Jul 9 17:18:46.077 [initandlisten]

问题 I encountered the following warning after converting a mongodb replica set to a stand alone server. I did rs.remove('host') and removed the replSet arguments when starting the mongo db. [root@sam ~]# mongo MongoDB shell version: 2.4.3 connecting to: test Server has startup warnings: Tue Jul 9 17:18:46.076 [initandlisten] Tue Jul 9 17:18:46.076 [initandlisten] ** WARNING: mongod started without --replSet yet 1 documents are present in local.system.replset Tue Jul 9 17:18:46.077 [initandlisten]

问题 I want replicate a small array to specific length array Example: var = [22,33,44,55] # ==> len(var) = 4 n = 13 The new array that I want would be: var_new = [22,33,44,55,22,33,44,55,22,33,44,55,22] This is my code: import numpy as np var = [22,33,44,55] di = np.arange(13) var_new = np.empty(13) var_new[di] = var I get error message: DeprecationWarning: assignment will raise an error in the future, most likely because your index result shape does not match the value array shape. You can use

问题 I have a 3 dimensional matrix. I want to replicate the matrix of size 8x2x9 to a specified number of times in the third dimension given by a vector say [3, 2, 1, 1, 5, 4, 2, 2, 1] so that the resultant matrix is of size 8x2x21. Is there any built-in MATLAB function (I'm running version 2014a) to do this similar to the newer repelem function, for matrices? A simple example of what I need: % Input: A(:,:,1) = [1 2; 1 2]; A(:,:,2) = [2 3; 2 3]; % Function call: A = callingfunction(A, 1, 1, [1 2]

问题 I want to make a dedicated SLAVE machine for data replication of three database on three different servers. In other words, I want to do Multiple Master => SIngle Slave replication. Is there any way to do this, as simple as it can be ? Thanks ! 回答1: Multi-master replication (a slave with more than one master) is not supported by MySQL (besides MySQL Cluster). You can do a master-master replication of a circular (ring) replication (described here or here). In High performance MySQL 2nd edition

问题 When using internal security with Cassandra, what replication factor do you use for system_auth? The older docs seem to suggest it should be N , where N is the number of nodes, while the newer ones suggest we should set it to a number greater than 1. I can understand why it makes sense for it to be higher - if a partition occurs and one section doesn't have a replica, nobody can log in. However, does it need to be all nodes? What are the downsides of setting it to all ndoes? 回答1: Let me

问题 I'm facing a new challenge here. I can't seem to find precedence for replication from MySQL, running on a Linux box to MS SQL Server. Has anybody done this before? Most importantly all changes made to the MySQL database should be replicated on the MS database realtime or close. MS database are not likely to be updated in any other way, so a bidirectional facility is not required. I thought one way is to read the changes out of the binary log. Has anyone parsed one before? Thanks for your help

问题 I have a large and heavy loaded mysql database which performs quite fast at times, but some times get terribly slow. All tables are InnoDB , server has 32GB of RAM and database size is about 40GB . Top 20 queries in my slow_query_log are update , insert and delete queries and I cannot understand why they are so slow (up to 120 seconds sometimes!) Here is the most frequent query: UPDATE comment_fallows set comment_cnt_new = 0 WHERE user_id = 1; Profiling results: mysql> set profiling = 1;

问题 While doing a MySQL dump is easy enough, I have a live dedicated MySQL server that I am wanting to setup replication on. To do this, I need dumps of the databases to import to my replication slave. The issue comes when I do the dumps, MySQL goes full force at it and ties up resources to the sites that connecting to it. I am wondering if there is a way to limit the dump queries to a low priority state to which preference is given to live connections? The idea being that the load from external

问题 The exact error is as follows Could not load file or assembly 'Microsoft.SqlServer.Replication, Version=9.0.242.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91' or one of its dependencies. An attempt was made to load a program with an incorrect format. I've recently started working on this project again after a two month move to another project. It worked perfectly before, and I've double checked all the references. 回答1: The answer by baldy below is correct, but you may also need to