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Questions tagged [master-slave-replication]

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Dump sql cloud mysql instance for external replica

I followed this guide to create an external replica of a cloud sql server: https://cloud.google.com/sql/docs/mysql/replication/configure-external-replica.I am getting this error when I try to start ...
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22 views

High Available PostgreSQL with Patroni and Replication

I want to build a highly available PostgreSQL cluster using patroni with etcd. I want to have 3 server (1 master and 2 slaves) in my cluster, so if something goes wrong one of the slaves automatically ...
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1answer
24 views

MariaDB - Replication - Unable to login remotely

So I've been trying to configure MariaDB replication for our server. Unfortunately I cannot get it replicating correctly. So I've followed the MariaDB guide to the letter to get replication set up. ...
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1answer
20 views

Why is it not a good idea to use MariaDB's extra_port for replication?

MariaDB has an extra_port for administrative access that helps in cases the thread pool or main port is locked up. MariaDB's documentation says it's use case is primarily administrative access and it ...
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2answers
24 views

What is the maximum latency / distance mysql replication can tolerate without having errors or wrong data?

I have two machines in a master - slave replication. I want to know if they are in two seperate places e.g. London, England and Tokyo, Japan are there going to be any latency issues. What exactly is ...
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1answer
13 views

Fault tolerance for Database sharding and Database partitioning

I'm aware that database sharding is splitting up of datasets horizontally into various database instances, whereas database partitioning uses one single instance. In Database Sharding, what if one of ...
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16 views

Mysql replication is running poorly on one of the slaves with no apparent changes

We have been using a master with 2 slaves for as long as I can remember with no major issues. Both slaves are lower in specification than the master so I do expect there to be lags at times and have ...
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14 views

How to turn on GTID on MariaDB if already using binary/position replication?

MariaDB 10.3 current master config [mysqld] log-bin server_id=1 binlog-format=mixed expire_logs_days=10 current slave config [mysqld] log-bin server_id=2 binlog-format=mixed expire_logs_days=10 I ...
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40 views

Getting error while starting slave on MySQL slave./ Backups in MySQL 8.0.20

I want to set up below command for daily MySQL database backup.suppose We have more than 50 MySQL database in server. I am using below command to take backup of all databases on server. Note: I am ...
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2answers
42 views

Broken Slave MySQL : How To Fix MySQL Replication (BINLOG) error in the Slave?

Before we start I can give some info about the versions, Ubuntu - 14.04, MySQL - 5.5 I have successfully configured the Master-Slave replication with two EC2 Ubuntu instances. My master is in Ubuntu ...
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1answer
15 views

slow wal replay in backup postgres12 server

We have the following PG12 setup with Master, replica and readonly replica with archive. master and replica both has 2cpu, 4gb ram readonly replica with archive has 2 cpu, 2gb ram below you can ...
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1answer
16 views

PostgreSQL pg_rewind use cases

Let's say that I configured streaming replication between Server A (master) and Server B (slave). If server A goes down and Server B is promoted, would I be able to use pg_rewind, where Server B is ...
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37 views

PostgreSQL Streaming Replication with Switchover

I'm trying to provide streaming replication between a master (T1) and slave (T2) and swapping their roles when necessary (i.e letting T1 be a slave to T2). So far I am able to get this working if I'm ...
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32 views

MySQL 5.7 Master-Slave Replication Functional but Not Replicating New Records

I've got a Master-Slave topology set up with the following two servers: Master Information: OS: GNU/Linux Centos 7.6.1810 (Core) Kernel: 3.10.0-042stab140.4 MySQL version: 5.7.25 Server_id: 1 Slave ...
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55 views

Mysql 8 Replication and promoting slave to master

I am not using GTID based replication and I have only one master and one slave. This question is in general regarding Mysql 8 and I want to be prepared when I have to deal with production systems. I ...
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1answer
28 views

Postgresql Streaming Replication on Windows failover

Hello i have setup streaming replication using PostgreSQL 11 on Windows working OK. How can i manually use the replica ( it is hot_standby=on ) in case Master fails ? What are the steps i have to ...
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84 views

Mariadb replication slave broken

I run Mariadb 10.3 on a Debian 10.3 server. The database was standalone until now and worked fine. Now I want to set it up as a replication slave. I use this as a guide: https://www.linuxbabe.com/...
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1answer
29 views

Do I need to redesign my Database and get rid of foreign keys for successful replication?

I plan to set up MariaDB replication either in master-master or master-slave mode. The main issue I have now are worries after reading this documentation. We use foreign keys a LOT and we also use a ...
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1answer
24 views

SLAVE off when loading data into the MASTER from another database

I have an active MASTER/SLAVE replication (Mariadb 10.2) with a single database (see scenario 1) I decided to add in IMPORT database to populate the MASTER database as described in scenario 2. ...
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2answers
38 views

MySQL replication master-slave

I'm learning master-slave replication with MySQL and I could get it to work and also use the Percona backup tool to restore a slave. I learnt from this project https://github.com/vbabak/docker-mysql-...
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44 views

PostgreSQL Streaming Replication: no pg_hba.conf entry for use from host

I have been trying PostgreSQL streaming replication for couple of days using link https://www.percona.com/blog/2018/09/07/setting-up-streaming-replication-postgresql/ I have edited my master pg_hba....
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65 views

MySQL8.0 Replication Got Stuck “Applying batch of row changes (delete)”

When I configured Master-Slave replication it was working fine but after five weeks it is showing the following error. *************************** 1. row *************************** ...
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27 views

Mysql Replication-Master and two slaves

I have one master and 2 slaves,one is replicating but another slave which is read-only not replicating. From Master : show master status; +------------------+----------+--------------+---------------...
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90 views

PostgreSQL streaming replication, incompatible locales between different systems?

I have a PostgreSQL 11 server on a windows 10 machine. That machine is used in a harsh environment, and a win32 client program is used with it. That program requires cp1250 charsets. The windows is a ...
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0answers
66 views

How to check RDS MySQL database synchronization status

We were creating a read replica for an RDS MySQL (5.7.28) instance, and before the read replica became available one of our developer accidentally connected to the read replica and was able to write ...
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1answer
12 views

Replication members count limitation in MongoDB

Is it possible to configure only one secondary and one primary in MongoDB Replication?
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1answer
42 views

Can a MySQL 5.6 master replicate to a 5.7 slave, which in turn replicates to a MySQL 8 slave?

According to the docs, "MySQL supports replication from one release series to the next higher release series. For example, you can replicate from a master running MySQL 5.6 to a slave running MySQL 5....
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1answer
14 views

question about MySQL5.7 server(Master) and a MariaDB 10.3(Slave)

I have question: I want to install a MySQL5.7 server(Master) and a MariaDB 10.3(Slave).Replay SQL(select and update) on the slave server after SQL running on the master server.get slow sql log on ...
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13 views

Calculating Total Time Taken to Replicate

I wanted to know whether there are any open source tools or in built functions for generating replication metrics. Basically i wanted to calculate the time difference between changes in the Master vs ...
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1answer
20 views

How to add/update data from slave server to master server in MariaDB?

I am experimenting on whether I can tweak the functionality of master-slave replication. I can write data in my master server which gets updated in the slave server but it cannot happen the other way. ...
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1answer
99 views

Setting connection collation in master for slave replication

I am trying to replicate a MySQL 8 server (master) to MySQL 5.7 (slave) instance. I know it is not officially supported, but the thing is we need to use a service that has only supports MySQL 5.7. I ...
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1answer
32 views

MySQL replication not finished on next site call

I have 3 MySQL8.0 instances. Two of them are slaves. Each site call I‘m reading the slave till the first write Request is made. Afterwards Only the Master is used during the request. Now, if I write ...
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1answer
217 views

MySQL 8.016 master with MariaDB 10.2 slave on AWS RDS, Character set '#255' is not a compiled character set

I have a MySQL 8.016 master and a MariaDB 10.2 slave, both running on AWS RDS. This was working perfectly until today, when I figured I wanted to do chain replication instead, like this MySQL 8.016 ->...
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28 views

Alter Table operations blocks replication in MySQL

We are using Amazon Web Service's MySQL 5.7.26 with 4 read-only replicas. After some Alter Table operations we have found that the replication stops working. The symtoms are great replica lag that is ...
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2answers
112 views

MySql replication failed with error 1236 data position > file size with relay-bin file not increasing

My slave machine reset and now on SLAVE SHOW STATUS\G I have the error: Last_IO_Error: Got fatal error 1236 from master when reading data from binary log: 'Client requested master to start ...
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1answer
108 views

Renaming multiple databases on a MySQL slave

I have 4 mysql databases that I'm replicating from a master to a slave. In the past, I have renamed one of them because the slave is also a dev server where it has a dev version of that schema with ...
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1answer
381 views

Replication Hung - Seconds_Behind_Master Increasing

One of my slave is no longer replicating. The seconds_behind_master continue to increase, Exec_Master_Log_Pos does not increase, and Relay_Log_Space does increase. Slave_IO_Running and ...
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0answers
25 views

create backup on mysql master-slave

I have MySQL version 5.7 with a master-slave configuration. but I'm confused to make a backup cron. Is there a way to do a backup while remaining safe to master-slave? I heard that using mysqldump is ...
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0answers
11 views

Does replica config parameter affect primary/master RDS Postgres?

I want to add hot_standby_feedback = on to a RDS readonly replica. The problem is that the replica currently has a parameter group already attached, which is inherited from the master. My question is:...
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1answer
140 views

PostgreSQL 9.6 pg_rewind - takes a long time to replicate

I use Streaming Replication,and Replication works normally. Two servers are HA and PostgreSQL DB is replicated. The data in the DB is about 40G. When a failover occurs, the slave is successfully ...
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0answers
49 views

issues with temporary table with proxysql using mysql replication

I have the following stage, we are implementing a database with 3 nodes with proxysql, this database is using percona xtradbcluster, inside the code is created a temporary table and is successful its ...
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1answer
82 views

How to resynchronize replica in Postgresql

I have a server with Centos6 and Postgresql 9.2, I have set up a replica in postgresql to another server of the same characteristics, today in the morning I have an error in the archiver process on ...
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1answer
58 views

mysqldump generating inconsistent dumps

I cannot get mysqldump to generate a dump that will properly restore. The dump is being generated to setup a new slave, but whenever the slave starts up, it gets foreign key constraint failures. I'm ...
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1answer
54 views

Could you monitor all changes made within a postgresql database by somehow subscribing to the replication log?

I've been reading about postgresql replication and was wondering if it was somehow possible to listen to the replication binary log and push that to some tool like sumologic or splunk so that any ...
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0answers
116 views

Applying batch of row changes (delete) MySQL Replication Stuck

I am using Master Slave replication for master and slave . Master Configuration 64 GB RAM 2 TB SSD Slave Configuration : 16 GB RAM 2 TB SSD My database size is 750 GB. When i configured ...
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1answer
124 views

Can we replicate or restrict specific databases in MongoDB

In MySQL, we are having replicate-do-db/replicate-ignore-db during replication, where we can replicate or restrict specific databases from Master to Slave. In the similar way, is there any specific ...
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1answer
376 views

MySQL [Bad handshake] error after update

I have MASTER-SLAVE configuration on 2 servers. The MySQL replication is set over SSL (I use self-signed certificates). Everything had been working well. But today some packages (mysql also) were ...
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1answer
427 views

Is it possible to configure pgbouncer to distribute queries among master and slave?

We have master (write-read) and slave (readonly) Postgres 10 databases. Slave is online replication from master. Now our application (c# webapi) connects to master only directly. We want to execute ...
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1answer
21 views

created and deleted a database on mysql slave host by mistake

I have 2 hosts: server1 (master) and server2(slave). By mistake I've created and dropped a database "test" on server2(slave). If the cluster will switch the master to server2, will there be any issues?...
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1answer
41 views

MySQL Fast Database Data Validation Master/Slave

I'm moving a MySQL database from the US to Australia and have a requirement where downtime is kept to an absolute minimum. The database is 400GB is size, replication is working without any issues. ...