Replication is the process of sharing any level of information so as to ensure consistency between redundant hardware/software resources to improve reliability, fault-tolerance, and accessibility

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MySQL - How to see the queries executing by slave io thread

We have a strange problem with MySQL replication. We have observed huge load and IO wait on server while replication is in progress. We can have information of the queries from bin-log by using ...
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61 views

SQL Server 2008R2 - Replication - Log Files / Indexes

We have 4 SQL Servers engaged in Transactional Peer to Peer Replication. I am doing some work on the Indexes and have noticed 2 things I didn't expect: The Indexes have different fragmentation ...
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Setting up binary replication between two PostgreSQL instances

I have two virtual machines: dbrepa (-.175) and dbrepb (-.191). Both have PostgreSQL 9.2 installed; once PG was installed (never initialized) on dbrepa, dbrepb was made as a clone. I need to have the ...
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51 views

Differing AUTO_INCREMENT values between 5.1 vs 5.6 slaves

I have a MySQL 5.6.21 slave and a MySQL 5.1.73 slave that are both replicating from the same MySQL 5.1.73 master. I noticed that for several of the tables ( I said several because when I try to rerun ...
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82 views

MySQL replication working, but data is out of date

I'm trying to figure out why even though SHOW SLAVE STATUS isn't reporting any errors, nothing is replicating (see below): both nodes are running: mysql> SELECT VERSION(); +------------+ | ...
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44 views

How to investegate MySQL crash on windows?

I have MySQL 5.6.19 running on Windows Server 2008 R2. I have 3 servers A, B, C Server A is a stand alone server. This server had data that can't be placed on SERVER B (ie. users information.) ...
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69 views

sql server snapshot replication compatibility issue

I have 2 SQL Server 2008 R2 and I am trying to set up Snapshot Replication over the Internet. I have successfully managed to get the subscriber to connect, but now as the Job executes on the ...
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55 views

Replication in mysql with many servers

There are 3 shops. In each of these is a mysql server. I want all servers to synchronize their date if at least one server changes the date. I read a bit of literature and realized that I need ...
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How would I run DELETE queries on a Master Without Executing Same DELETEs on a Slave?

If I want to run a query that will only execute on the master mysql server and not the slave. assuming we have an environment with replication through query logs. Could I and how? The idea is to have ...
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3k views

mysql replication on windows server

How to setup replication(Master/slave) in MySQL 5.6 while both servers are windows based? All the things i have fond are Linux based replication. kindly someone help who experienced replication with ...
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1answer
2k views

Does `Seconds_Behind_Master` show exact Slave Lag from Master?

Does Seconds_Behind_Master always show the correct number of seconds the slave is behind the master? I have also Implemented the mk-heartbeat replication monitoring. It was showing the other result ...
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38 views

Last synchronization time between master and slave (replication)

During replication process where a Master is connected with slave. Some times connection between these two goes down. Any options to get the details of the last synchronization time?
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How to keep the sync active with Bucardo

I have a master-master sync setup between 3 nodes or 3 different host machines using bucardo. All works good. However when one of the database or a host is not reachable or goes down for some reason, ...
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255 views

mysql second slave not syncing while first slave works fine

I have a master (m) - slave (s1) setup using mysql 5.1.45 When I try to add a second slave (s2) the slave lags behind and never catches up on the sync. Even after having synced the s2 with the whole ...
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1k views

Replication fails because of a non-existent foreign key

I have been trying to get a previously working replication to start working. I have tried many settings, but I can't seem to make it work. Here is the scenario. I dropped all the FK constraints ...
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32 views

Replication not updating XML Schema collection

So the problem I'm facing is that replication from our Main instance to our Data Warehouse instance is failing because it isn't picking up XML schema updates. Thus, when it tries to bulk copy the data ...
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108 views

Creating SSL certificates for a MongoDB replication set

So I figured out my issues regarding connecting a node to a node or a client to a node in my replication set and now I'm trying to figure out how to bring this together so that all of my nodes can ...
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462 views

Issues with self signed certificates, SSL and MongoDB

Note: As specified in my comment I've figured out a solution to this issue regarding a single client/mongo connection. The next step is to figure out a solution for a replica set involving this fix. ...
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7 views

MySQL Master Slave replication seems to affect whole solution

We are running 2 master slave pairs on a web application MySQL 5.1. The concept is to keep all data in sync so that we can via a config file point all customers at one master slave pair to do ...
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234 views

Deleting data from a large table with replication

I need to delete all the rows from a given table. The table contains millions or records. The master database is being replicated to several slaves and I wish to do that without creating a replication ...
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MariaDB replicate views

I have a database in MariaDB from which I wan't to provide information from some of it's tables (for example, from the users table I don't wan't to showpassword, and also skip some users, like admin) ...
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154 views

MySQL Binlog Dump process stops after net_write_timeout

We have 2 MySQL 5.6.19-1 servers with master-master replication that were working fine (DB01 and DB02). One of them was rebooted unexpectedly (DB01) and seemed to be working fine, but we saw that the ...
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42 views

Dealing with Mysql Replication and Functions

In MySQL replication Master-Slave, is there anyway to deal with the functions: LOAD_FILE() UUID(), UUID_SHORT() USER() FOUND_ROWS() SYSDATE() GET_LOCK() IS_FREE_LOCK() IS_USED_LOCK() ...
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27 views

Replicating tables from LAN database to web server?

I have an in-house database (that's actually part of a third-party product) running on 2008R2 Express. We'd like to display some of the data on a new website we're working on (running 2008R2). I'm ...
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Disk space recovery on Mongodb replicaset secondaries

Is it possible to recover disk space on replica set secondaries based on the results of a repairDatabase call performed on a primary? I can't seem to locate anything that would work short of bringing ...
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36 views

Is there any drawback of MIXED replication mode?

So, recent mysql server allows three types of replication mode: STATEMENT, ROW, MIXED. They all have pros/cons, and I pick the mode according to site characteristics. When I get a replication error I ...
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100 views

Live Partial Table / column replication

I want to know if there is a way to achieve the following with SQL Server 2012 Enterprise Edition? I have Table A: on Server 1 with say 10 columns. Table A: | col1 | col2 | col3 | coln | col10 | ...
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MySQL Cluster Master Master Replication - broken Leg

I have two MySQL Clusters which normally operate with Master - Master Replication between two of their nodes. Site 1 gets the majority of the write traffic, with Site 2 writing small amounts of ...
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65 views

RAID drives or replicate data?

I have an old Microsoft SQL server that, for financial reasons, I cannot replace until later in the year. The OS, DB and temp files are on one 10k RAID 5 array (I didn't design it) The server is ...
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145 views

Bucardo doesn't do fullsync

I have a 2 computers, one of them called master, and the other called slave both using PostgreSQL 9.3.5, but has different OS (32-bit and 64-bit) I have installed and setup the bucardo on the server ...
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18 views

mysql replication error 1236 need to restart replication process

I'm using mysql replication and the slave/master crashed in the process and then I got: Got fatal error 1236 from master when reading data from binary log: 'Could not find first log file name in ...
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44 views

Create table on a Master - Master config avoiding replication

I have a Master-Master configuration. What I want is to create an auxiliary table only for a report project so it's not necessary to replicate it. Is there a specific way to make this in the CREATE ...
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MySQL - Checksum won't match between master and slave hosts despite dumping and reloading the table [duplicate]

I am playing around with table checksums and I am puzzled as to why I cannot get two checksums to match. I have two hosts, one being a slave for replication. I have a particular problem table that ...
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327 views

“ORA-00936: missing expression” setting up Oracle Publisher in SQL Server

I'm trying to set up an Oracle publisher in SQL Server so I can perform replication. I've gotten connected to Oracle, the drivers work great (I have other linked servers), I can select an article I ...
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49 views

How to swap roles of Master-Master?

I've just taken over the responsibility of managing our MySQL databases. We're running Percona Server (GPL), Release rel24.1, Revision 217. Our setup involves two servers both running as master and ...
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1answer
103 views

Pre-production database replication solution

I would like to start by specifying I am no DBA and have basic understanding of advanced DB concepts. I am trying to find the optimal solution to replicate our production database to our ...
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2answers
109 views

MySQL Slave has unmanagbly higher IO load than master

A MySQL slave having a higher disk load than the master or not being able to keep up is not unusual, nor are questions about it on Stack Exchange, but I did want to run my issue by here, because in my ...
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452 views

MySQL 5.6: explicit_defaults_for_timestamp

I have the following replication topology: DB1 (MySQL 5.5) -> DB2 (MySQL 5.6, explicit_defaults_for_timestamp = 1) -> DB3 (MySQL 5.6, explicit_defaults_for_timestamp = 1) - "date" field: ...
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182 views

MySQL master slave replication not working

I had MySQL master slave running and working fine but suddenly it stopped. I don't know which commands have been executed but now replication is not working. I am very new to MySQL can anyone help me? ...
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92 views

for archive_command use an script rather than a command

I want to create a configuration to get a PostgreSQL HA. In my Master I want to configure a postgresql.conf file with this: archive_command = 'local_backup_script.sh "%p" "%f"' instead of: ...
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61 views

CRC checkup in MongoDB

I am new to MongoDB and currently working on a project. I read tutorials but I'm unable to find any information about Cyclic Redundancy Check (CRC) in MongoDB. Is there any way to check that the data ...
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348 views

How to split task (read and write) between two mysql server via HAproxy load balancing?

I have done some test and setup two (A and B) different database server from the following link - https://www.digitalocean.com/community/tutorials/how-to-use-haproxy-to-set-up-mysql-load-balancing--3 ...
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1answer
89 views

How the xlogs files travels form Master to Slave

I have some doubts about how the workflow proccess in PostgreSQL replication using archiving logs. If I have this configuration in Master postgresql.conf: archive_command = 'test ! -f ...
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30 views

When do I have to use archive_command and when not

I have some doubts about PostgreSQL replication command. I am doing some research and I found severals configurations. first one is: archive_mode = on archive_command = 'cd .' second one is : cp ...
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1answer
22 views

Automatic slave reconfiguration after updating master

I have development mysql master and slave servers and a prod server. I need to set up regular (once a week) syncronization of dev and prod databases. It would be easy for me to use prod# mysqldump > ...
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29 views

MySQL Replication problem with VIEWS and “Sub-Databases”

I've got three servers that should do a master-master replication. On server 1 i got "01_maindb" which holds the master tables. I replicate this table to the two other servers without problems. ...
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Did a SQL Server instance ever participate in replication?

How can I tell whether a SQL Server instance ever had replication in use or not? I'm debugging an issue with a 3rd party software. This software (Red Gate SQL Backup) reports the distribution database ...
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526 views

MySQL replication - some values are not being replicated

MySQL Replication issues I might sound clue less here as i am :) , I am having problem with mysql replication, i.e. replication seems to be missing in some random occasion. My structure looks like: ...
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why is latency growing

I have a 4.4TB database that I've been transactionally replicating to 2 different subscribers just fine. Yesterday I added a 3rd subscriber that is all flash drives to test how much better it will be ...
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65 views

How to delay replication start

I'm creating a new publication for replication using the @allow_initialize_from_backup option to avoid the snapshot immediate creation and therefore locking all objects replicated on articles. The ...