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Questions tagged [master-slave-replication]

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SQL Server replication model snapshot, transactional and merge - which method can be used

I am trying to implement sql server database replication between 2 branch servers to a Head Office Server. My application is a distributed one, the main application is hosted on head office which is ...
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mariabackup --prepare after copying to slave

Hi dear community of smart people, I'm setting up MariaDB master/slave replication and for the first time I have decided to try mariabackup utility for transferring the full database backup from ...
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MySQL: Ignore a Row in a table of a particular Database

I had replication in place between 3 databases, I am trying to ignore a Row in a table of a particular Database. I tried many ways but i couldn't, and also i couldn't find anything in online that ...
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Is there an option to prioritize a table while replication conflict occurs?

I have a master slave configuration for my production stage environment. Sometimes I need to write to some tables of my stage server i.e slave server. In that case conflicts occurs as content from ...
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Issue with Time Zone while migrating MySQL on-premises DB to AWS RDS

I am having MySQL 5.6 database with PST time format in on-premises server. Now we are willing to migrate the database to RDS. For this, we have taken backup from physical server and restored in RDS ...
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How to reduce replication lag between master slave Aurora MySQL db instances?

AWS aurora MySQL master slave DB instances have high replication lag around 19 millisecond. Please let me know how to reduce the replication lag time?
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36 views

Error 'Unknown Collation: '2048' on query

I'm doing MYSQL Replication for the first time. Master mysql version: mysql Ver 14.14 Distrib 5.1.52, for pc-linux-gnu (i686) using readline 5.1 Slave Version: mysql Ver 14.14 Distrib 5.1.73, for ...
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21 views

mysql drop user has broken the replication

I was dropping a user on master. But that didn't execute on Slave. Instead its broken the replication. GTID enabled Parallel replication enabled. On Master: Binlog-do-db: prod_db binlog-ignore-db: ...
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1answer
31 views

MariaDB replication from master to slave

After doing some research around this topic, I should be attempting this task soon. However, I have two questions going around my head - could do with an experienced professional answering them. I am ...
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mysql cluster with 1 master 1 node and 2 slave

My Query is I want to set up MySQL cluster with 1 Master 1 Node and 2 Slave with Auto failover. If my master is down node should assign slave as a master. Can anyone suggest me an idea to do that? As ...
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1answer
48 views

How to solve replication in MongoDB only with two machines?

I have two machines connected in a ring network, each one running Wildfly in HA mode using JGroups ant MongoDB in HA Mode using Replica Set. The machine 1 is the primary and machine 2 is secondary. ...
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Postgresql streaming replication slow on macOS

I am using PostgreSQL 10.1 on MAC on which I am trying to set up streaming replication. I configured both master and slave to be on the same machine. I find the streaming replication lag to be slower ...
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global foreign_key_checks = 0 on RBR slave

Example schema: CREATE SCHEMA account; CREATE TABLE `user` ( `id` INT(11) NOT NULL AUTO_INCREMENT, `name` VARCHAR(50) NULL DEFAULT NULL, `address` VARCHAR(50) NULL DEFAULT NULL, ...
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1answer
137 views

MySQL Replication Slave Status OK but Data inconsistent

We are using MySQL 5.7, and have a Master and 3 Slave servers replication setup. All the 4 servers are dedicated for MySQL use only, and belong to the same data-center, connected over Private Network. ...
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1answer
33 views

Can i control access end point When some table data changed In Mysql Semisynchronous Replication

I'm trying to set up One master Multi slave in MySQL 5.7 My architecture is like this. Master - First slave(sync) Second slave, Third slave, Fourth slave, Fifth slave(async) My question is, If ...
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1answer
31 views

PostgreSQL - Replica Recovery Process Stuck frequently (epoll_wait taking too much time)

We have Master Slave Setup with Asynchronous Streaming Replication (Replication Slots). Frequently our Replica's entire Postgres processes seems to be doing nothing (or stuck?). Since ...
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How to get the Slave commit timestamp using MySql replication?

I've been looking for ways to collect information about the replication delays on MySql 8. I found an alternative solution, but I imagine there's a more straightforward way to do that. By reading its ...
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1answer
115 views

Mongodb replica set primary and secondary node conf fail when one slave is down

In my env, I had created MongoDB replica set conf for high availability so one server fails should be handled by other also in my conf I have 3 DB server and 1 arbiter too but, my slave's server ...
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27 views

Why slaveDelay is not respected by mongoDB replica?

I've seen related article below: Mongodb replica config slaveDelay but data still sync immediately My secondary node is set to be delayed by 3600 seconds: ... "members" : [ { "_id" : 0, ...
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1answer
31 views

Seconds_Behind_Master alternates between 0 and a number x

I have a slave server with mariadb 10.3.10 on debian 9. For several days the server has been working correctly, Seconds_Behind_Master was always kept at 0 indicating that it was properly synchronized. ...
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1answer
26 views

Master slave replication with different mysql version is on both slave and master

Currently, we have MySQL master-slave replication. Both master and slave servers have Mysql 5.5 Currently I need to add one more Master server having version 5.7. Is it possible to add Multiple ...
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1answer
16 views

What's the difference between Replicate_Wild_Ignore_Table & Replicate_Ignore_Table?

In my site's master/slave setup: Replicate_Wild_Ignore_Table = %.cache%, & Replicate_Ignore_Table is empty. What's the difference between the two?
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1answer
26 views

Finding temporary table name in MariaDB

As I reported some days ago to MariaDB bug tracker the following bug: https://jira.mariadb.org/browse/MDEV-17420, slave replicas with version 10.2.x are leaking temporary tables on MyISAM files. Our ...
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138 views

percona slave ERROR 1872 (HY000)

I have setup PXC on CentOS 7.5 and replication between PXC nodes is working just fine. However, when I try to set up a slave on one of the PXC nodes, I get this error when I run "START SLAVE". root@...
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28 views

Does the row locking on slave database also apply to master database?

In a transaction, for example, START TRANSACTION; SELECT count(*) as count FROM `order` WHERE user_id = 25286 LOCK IN SHARE MODE; INSERT INTO `order` (`id`, `user_id`, `product_id`) VALUES (NULL, '...
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54 views

Cascading binary replication to logical postgres

Im using Postgres 10, and I was wondering if its possible to cascade a logical replication from a binary slave replica? I am looking to have databases with the same data but indexed in a different way ...
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1answer
42 views

Create a mysql replication from multiple master and single slave server? [closed]

How to create mysql replication with multiple master server and with single slave server? how to edit the "CHANGE MASTER TO MASTER_HOST='12.34.56.789',MASTER_USER='slave_user', MASTER_PASSWORD='...
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1answer
23 views

Mariadb 10.1.13 - log positions similar but “seconds behind master” is behind

The setup I have is a master/slave replication, both running Mariadb 10.1.13. On the slave I noticed that the Seconds_Behind_Master parameter is showing a delay due to some form of lagging, but the ...
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1answer
47 views

Mysql Slave Claims to be Running but New Records Not Appearing and No Delay

I've created a new mysql master and a slave. My master is also a slave of another running instance. The replication between those two works fine so I don't believe my issue is there. I created a dump ...
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1answer
20 views

MySQL how to migrate to new server without data lost?

I'm using AWS RDS, with 1 master & 1 slave. Just now I alter 1 of the table and hangup halfway, so I force stop the process. Now the database got some problem. Let say I wanted to instantiate a ...
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1answer
44 views

Can I stop replication of create/drop index statement on one slave of Mysql 5.6?

I have this cluster where master and slave uses same indexes but one of the slaves has some extra indexes (large machine which runs some analytics queries). So I have to maintain two sets of indexes. ...
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1answer
121 views

Master-slave replication doesn't work on PostgreSQL 9.6

I tried to create a master/slave configuration with two servers and Postgres 9.6 I modified master and slave postgresql.conf in /etc/postgresql/9.6/main Same for master and slave: data_directory = '...
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1answer
23 views

Some dates replicated with a +4 offset

I've set up replication between an EC2 instance as master and a MySQL 5.5 RDS instance as slave. Everything is (mostly) fine except for one odd thing: the dates in a transaction table are either ...
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1answer
53 views

Replication of databases with specific prefix on master

There are options to dynamically set variables on replication slaves, like replicate_wild_do_table and replicate_wild_ignore_table. But, are there any options for replication master to dynamically set ...
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1answer
67 views

Master DB Ran Out Of Space

My master server ran out of space today (at 20:22). My transactions logs ended up broken into multiple files: -rw-rw---- 1 mysql mysql 228M Jul 31 20:22 mysql-bin.000914 -rw-rw---- 1 mysql mysql ...
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1answer
273 views

MySQL Replication binary relay logs transfer too slowly

Master server MySQL 5.6.28 Ubuntu 14.04 8 core CPU Slave server Slave: MySQL 5.7.22 Ubuntu 18.04 16 core CPU Both of them have 64GB of RAM and plenty of disk space. What I did up to this ...
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1answer
230 views

MariaDB master-slave replication failover and failback

I'm trying to configure a DR instance of MariaDB (10.1.13) using master-slave replication. I was able to establish the master-slave relationship with GTID by locking the tables on master, backing up ...
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74 views

Add new slave in MariaDB Replication

I have a Master server (A) and a Slave server (B). B is getting replicated from A [all the dbs (db1,db2,db3) except few tables]. Now, I need to add one more Slave but It has to replicate only db1 and ...
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1answer
132 views

PostgreSQL Slave keeps xlog files with replication slot

I setup one master and two PostgreSQL servers (v9.6). In the master (and slaves) I set max_replication_slots = 2 and archive_mode is commented out everywhere. The replication works fine: There are no ...
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28 views

percona mysql key_buffer_size value on replication slave

I noticed way odd behavior of replication slave due to altering key_buffer_size parameter. I have 5.6.39 version of percona mysql and RAM 257671MB, according to the articles in the Internet i ...
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1answer
158 views

Why is MDB 10.2.14 not handling deadlocks properly when it did prior to upgrade from 10.1.22

Since upgrading MariaDB 10.1.22 to 10.2.14 our MariaDB slaves are encountering deadlocks that are not handled in less than 600 seconds thus the classic semaphore decision to crash the server. The ...
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198 views

Master-slave replication in MariaDB

I worked around with Master-slave replication in Mariadb 5.5.52 on RHEL 7.3 environment. Master: [mysqld] log-bin server_id=1 binlog-do-db=nagios binlog-do-db=nagiosql binlog-do-db=nagiosxi bind-...
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635 views

Queries running very slowly in Amazon RDS PostgreSQL read-replica

We have been maintaining a project which has both web and mobile application platform. The backend of the project is developed in Django 1.10 and deployed in AWS. At the beginning, when there were ...
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1answer
104 views

Row-row based logging in a blackhole replication filter setup?

I am using two MySQL server instances on the same server to filter replication to a third external server. My filter slave is using the blackhole engine as described here: https://dev.mysql.com/doc/...
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1answer
70 views

Row based replication on slave where as statement based on Master

We have a master slave setup of MYSQL 5.6. Master and slave runs SBR replication where as slave is not writing binlogs. We need to enable binlogs on the Slave server but we want the binlogs to be in ...
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1answer
65 views

Restore server instance using logical backup and wal files

Is it possible to restore a database instance using logical backup and wal files? A senior SQL Server DBA asked me to implement below scenario in PostgreSQL took the logical backup using pg_dumpall ...
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1answer
325 views

Load balancing between 2 servers using MySQL Router

I want to setup a simple master-slave MySQL replication. I also want to balance the load between the 2 servers. Can I use MySQL Router 2.1 for that purpose? As I read the official documentation, it ...
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2answers
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slave mysql configuration is not stored

EDIT It seems that the problem is with my SSH connection, so I created a different question on serverfault. From what I understand so far, it that this problem is caused from the fact that the port ...
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1answer
1k views

Mysql replication broken due to 'Duplicate entry' with error code 1062 on slave server

Mysql Slave replication was working fine, but suddenly it has crashed due to duplicate entries error The slave SQL thread stops due to duplicate entries in MySQL DB, which I have kept in ...
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171 views

Postgresql - Unable to connect slave after replication starts, but able to connect from remotely

I have a PostgreSQL master/slave setup. Today I created a new slave from the existing slave (cascading replication). Master: 10.0.0.1 Slave1: 10.0.0.2 Slave2: 10.0.0.3 (this is the new one I have ...