Questions tagged [master-slave-replication]

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Issues with failback for logical replication using postgres

I am using PostgreSQL 13 to set up logical replication. When the original active node (A) becomes the secondary, the prior secondary(B) which is now active node needs to sync to the (A) node. To ...
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How to switch the Slave Server (Standby Mode) to Normal Mode to PITR in postgres? [closed]

Description I have Two Server (Master and Slave). I have set up the Slave server in such a way that the slave server is delayed 3 days from Master Server. Now I want to start PITR from Slave Server. ...
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18 views

Mysql Replication trigger not executing on slave

Mixed replication is enabled. MySQL master has a table Products that has triggers on update and delete. On slave database we have different trigger on same table on update and delete. Master database ...
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Why is it that my redis slaves are not promoting to master when requirepass, masterauth is enabled on my original master server?

I am running redis on 3 VMs. When authentication (requirepass, masterauth) is disabled, a slave will be promoted to be the master, but when I put authentication on it, no slaves are being promoted. ...
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22 views

MySQL: slave log sequence number is in the future (but master is fine)

I have a master server replicating to a slave. I'm being plagued by this error message on the slave: 2021-07-01 08:39:25 7f04881ee700 InnoDB: Error: page 194 log sequence number 142640849934 InnoDB: ...
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1answer
19 views

Why slave_parallel_workers affects TPM

I ran a few HammerDB benchmarks and mess with the configurations. And I notice different values of slave_parallel_workers have a considerable impact on TPM. As far as I understand, ...
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10 views

Is there an option in redis for a slave to not be promoted to master?

What I want to accomplish is to not let my VM in Zone 3 be promoted to master? Is there such thing on Redis? Similar to mongo members.priority? Here is my setup Zone 1 redis-1 192.168.0.1 Zone 2 ...
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20 views

Privileges of mysql/mariadb replication accounts

I've created a replication account on a master(server1) and client(server2). This is the output of SHOW GRANTS FOR 'repl'@'192.168.1.%'; on a master; GRANT REPLICATION SLAVE, BINLOG MONITOR, ...
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1answer
13 views

Replication setup

Currently, I have a production setup which consists of one Primary server and one Replica server, lets call them Primary1 and Replica1. All databases from Primary1 are replicating to Replica1. Now, I ...
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7 views

How to do mysql 8.0.24 master-slave replication switch?

I am using two machines for mysql 8.0.24 master-slave replication, if the master database hangs, what action can the slave database take to become the master?
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Editing file /etc/mysql/my.cnf for Master-slave repllication

here is my "my.cnf" file: # The MySQL database server configuration file. # # You can copy this to one of: # - "/etc/mysql/my.cnf" to set global options, # - "~/.my.cnf" ...
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After mysql 8.0.24 does master-slave replication, if the master database hangs, how does the slave database switch to the master database?

After mysql 8.0.24 does master-slave replication, if the master database hangs, how does the slave database switch to the master database? If it can switch, what are the exact steps? If switching is ...
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2answers
39 views

How to make transactions atomic in Mysql 5.6

How do we make the following transactions atomic? conn - is a connection to the old primary, which is being reset as replica now. Python code conn.execute('unlock tables') conn.cursor().execute('stop ...
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15 views

How does the slave database server back up the logs of the master database server?

Now that the master-slave replication architecture for MySQL 8.0.24 has been built, how does the slave database server back up the logs of the master database server? I'm looking for transaction logs ...
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1answer
14 views

GCP Cloudsql Mysql Replica unresponsive after mass delete on Master

Directed here from S/O We have a Master/Replica configuration for Mysql innodb(5.7.32) databases in Cloud SQL... We have a single Table (let's call it Master table) partitioned on Two keys having both ...
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1answer
24 views

Archive logs Pg_archive cleaner

I have Postgres installed on windows 10. I have master-slave replication ( 1 pc is master and 2 other pc are slaves). I have archive logs saved on a file on master pc and slaves are connected to that ...
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1answer
14 views

How to setup Mysql master-slave replication with the slave meant for testing where divergence is OK

Problem: I have a staging DB server on which functionality is tested before pushing it to the production environment. Now, we want to start doing VA/PT (Vulnerability Analysis and Penetration Testing) ...
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1answer
14 views

migrate mysql DB between two servers using replication

I need to perform some steps, I have to migrate our company live DB to a new server, if I use normal way such as lock table, mysqldump, scp, mysql restore, it take around 5-6 hours, so I want to make ...
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21 views

PostgreSQL Slave unable to catch up with the Master

We have a four node Patroni cluster setup wherein one of the nodes is unable to catchup with the leader because of huge lag. I have tried the below steps but none of them are working. Restart the ...
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137 views

Got fatal error 1236 from master when reading data from binary log

I am trying to do a MySQL failover, in some situations I endup with broken replication. Any idea what could be the cause of it ? Background Needed to perform a host updates on master host. Hence ...
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39 views

Faster way to restore MySQL innoDB dump

I have a below MySQL configuration. # The MySQL server [mysqld] .... key_buffer = 384M max_allowed_packet = 5M table_open_cache = 512 sort_buffer_size = 2M read_buffer_size = 2M read_rnd_buffer_size = ...
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Error 1062 : Duplicate entry on the slave after a failover

I need a little bit of help for this problem : I got this error : Could not execute Write_rows event on table ....; Duplicate entry '16XXXXX-\xE790\XXXXXXX-16XXXXXX' for key 'PRIMARY', Error_code: ...
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1answer
85 views

High Memory Usage on Replica - Mysql 8

Hope you're doing well. We've recently moved to Mysql 8 (from Mysql 5.7). We're using AWS RDS Service with MySql. The AWS Team is also looking for a solution btw. Since a few days, we're facing ...
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1answer
32 views

High memory usage in Masters with MariaDB and Vitess

I'm running a Kubernetes Cluster with MariaDB 10.3.20 and Vitess 6. Everything is running fine, but the memory usage in the Master nodes is always around 90%. I don't have OOM right now, but I was ...
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1answer
37 views

How to properly restart a MySQL Master server?

We are running on Azure VM wherein you can not expand the attached disk while the VM is running. So we need to stop the VM first before doing anything on the disk size/performance. We just have 1 ...
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1answer
29 views

How to change MySql Master-Master Replication to Master-Slave Replication

I currently have MySql Master-Master replication set-up with Read_only on Master2. There were lot of sync issues so I've stopped replication from Master2 to Master1 by stopping the Slave in Master1. ...
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1answer
104 views

What does this error mean “A slave with the same server_uuid/server_id as this slave has connected to the master;”?

Upon searching for this, the main cause of this error is usually when using snapshots or cloning the machine. But I did not do this. I perform mysqldump --master-data=2 on the master then restore the ...
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1answer
120 views

fatal error 1236 from master when reading data from binary log: 'Could not find first log file name in binary log index file'

I'm getting the following error; Got fatal error 1236 from master when reading data from binary log: 'Could not find first log file name in binary log index file' I've tried setting this up on 3 ...
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1answer
33 views

Does a single replica gives any performance improvement?

Consider a case where you have a single PostgreSQL database. Then you add a replica (hot standby) and you send all the reads to that replica. This is what does Rails for example. Does this gives any ...
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1answer
232 views

Mysql Innodb Cluster Replication

Hello Everyone, This is the first time I'm doing cluster replication. But I stuck on Adding Instance. I don't know why this error is coming behind. "The error says The START GROUP_REPLICATION ...
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2answers
28 views

Is it possible to have 1 slave server with multiple master?

Here is my set of master server: DbServer1 - 10.1.0.1 DbServer2 - 10.1.0.2 DbServer3 - 10.1.0.3 DbServer4 - 10.1.0.4 and my replica server would be on 10.1.0.5 Is this doable if I create 4 instances ...
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1answer
39 views

Troubleshooting “Can't connect …” from MySQL slave to master

Although I can connect from slave to master via a command-line mysql client, my slave can't connect to the master as part of its replication task. SHOW SLAVE STATUS cites a "Permission denied&...
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41 views

MySQL Master and Replica different size of files

Recently I noticed that my replica and master storage is quite different. To be exact replica takes 250GB more. Both are dedicated servers, both are exact specs, both have exact disk drives and ...
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159 views

Mongo Atlas connection error type=UNKNOWN, state=CONNECTING

Yesterday I've seen some strange behavior that my application can't connect to Atlas. This has never happened before for about 1 year, and there was no application deploying going on. The error that ...
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9 views

Pgpool create a cluster node with no application traffic

I have a pgpool cluster with 2 standby and 1 primary node. I am trying to create another node which will get replicated but will not handle any request or application traffic. It will solely be use ...
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20 views

Make slave has same “general_log” table like master server

Apologize for my English. I'm very new to database administration. I've been trying to set up MariaDB replication server by following this document. The only data that I need to replicate is in a ...
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31 views

Binlog is not being updated in Master

I am using mysql 5.6.19-log MySQL Community Server (GPL). I have done the necessary changes in my.cnf to start Master<->Slave Replication. But binary files are created and but they are empty. ...
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1answer
209 views

Mysql 8.0.22 master slave replication: why slave is trying to create user?

I am following this repo (https://github.com/alexanderfefelov/docker-mysql-replication) to setup one master one slave replication. I am not able to get it working. The master seems to be OK, but the ...
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1answer
219 views

mariadb: replication master and slave have equal MySQL server ids

I'm a novice mariadb user trying to set up a master with multiple slaves using mariadb-10.4.17 on fedora33. I believe at one point I inadvertently ran the "change master" command on the ...
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2answers
646 views

Change host IP of master in mysql replication

I have one master and one slave. Suppose IP of master is changed but the physical server is same. Now I want to update the new IP (of the master) at the slave server. At the slave server ...
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1answer
46 views

Postgres 10 Log Shipped Replica with cascading replication

I'm planning for a tricky (at least for me) migration whereby I have master postgres 10 db from a cloud provider that will not allow for replication user connection. I do have a base backup and WAL ...
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1answer
32 views

MySQL DB as Master for some tables and Slave for others

I have 2 DBs - DB1 (back-office) and DB2 (web application). The data needs to be synced between the 2. I'm happy with the idea of full master-master replication and may have to implement it, but ...
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0answers
67 views

How to hot merge MariaDb databases from multiple servers into a single one

Current Configuration I currently have 3 servers: server australia with the database canberra servers belgium and germany are a galera cluster with the database bruxelles. Target Configuration My ...
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26 views

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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1answer
106 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 ...
2
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1answer
144 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
43 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 ...
2
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2answers
123 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
64 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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0answers
76 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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