Questions tagged [master-slave-replication]
The master-slave-replication tag has no usage guidance.
231
questions
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0answers
14 views
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 ...
0
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0answers
9 views
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. ...
0
votes
1answer
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 ...
0
votes
0answers
10 views
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.
...
0
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0answers
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: ...
0
votes
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, ...
0
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0answers
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
...
0
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0answers
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, ...
0
votes
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 ...
0
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0answers
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?
0
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0answers
35 views
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" ...
0
votes
0answers
9 views
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 ...
-1
votes
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 ...
0
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0answers
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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) ...
0
votes
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 ...
0
votes
0answers
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 ...
2
votes
0answers
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 ...
1
vote
0answers
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 = ...
1
vote
0answers
85 views
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: ...
0
votes
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 ...
0
votes
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 ...
1
vote
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 ...
0
votes
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. ...
1
vote
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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 ...
1
vote
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 ...
0
votes
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&...
-1
votes
1answer
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 ...
0
votes
0answers
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 ...
0
votes
0answers
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 ...
0
votes
0answers
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 ...
0
votes
0answers
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.
...
0
votes
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 ...
0
votes
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 ...
3
votes
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 ...
1
vote
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 ...
1
vote
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 ...
1
vote
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 ...
0
votes
0answers
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 ...
0
votes
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
votes
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. ...
1
vote
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
votes
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 ...
0
votes
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 ...
1
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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 ...
