Questions tagged [master-slave-replication]
The master-slave-replication tag has no usage guidance.
172
questions
1
vote
1answer
29 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 ...
0
votes
1answer
51 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 ->...
0
votes
0answers
19 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 ...
0
votes
2answers
24 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 ...
0
votes
1answer
26 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 ...
1
vote
1answer
90 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 ...
0
votes
0answers
22 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 ...
0
votes
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:...
0
votes
1answer
79 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 ...
0
votes
0answers
13 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 ...
0
votes
1answer
36 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 ...
0
votes
1answer
37 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 ...
0
votes
1answer
18 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 ...
0
votes
0answers
20 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 ...
0
votes
1answer
29 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 ...
0
votes
1answer
176 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 ...
1
vote
1answer
78 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 ...
0
votes
1answer
19 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?...
0
votes
1answer
35 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. ...
1
vote
3answers
83 views
Mysql master-slave config in my.cnf
I'm following this guide to setting up a master-slave config (https://support.rackspace.com/how-to/set-up-mysql-master-slave-replication/) and i'm confused about the end of the document where they are ...
1
vote
0answers
57 views
RESET MASTER; does not reset GTID_EXECUTED
I'm trying to get replication up and running between two kubernetes pods, and am getting the dreaded @@GLOBAL.GTID_PURGED can only be set when @@GLOBAL.GTID_EXECUTED is empty. error.
root@central-vm:~...
2
votes
0answers
25 views
How I can find out which postgresql I am connected into when behind a load balancer?
I have the following database replication setup:
As you can see I do a master-slave replication and I use aload balancer in order to connect into read-only replicas.
So I want to test this setup, ...
0
votes
0answers
9 views
Is it possible to replicate a cluster (not just a node)?
Making a master-master cluster is easy, as is replicating one of the master nodes to a read only slave. As is replicating that RO slave to other slaves.
But, of course if the master node which ...
1
vote
1answer
27 views
Percona 5.7.24 : How to fix disk slave storage full
I find that my slave disk is full, but I don't understand what makes it full.
Can anyone help me explain what this file is?
And how it is formed, so that it makes lots of files that make storage full.
...
1
vote
1answer
42 views
MySQL 5.7 Can slave be ahead of master during replication
From my understanding, once commit() is received from client, transactions are written to binlog first before any commit is done to InnoDB.
In this case, is it possible for slaves to be ahead of ...
0
votes
0answers
24 views
Is it a good idea to have a read connection point to both write database and read replica?
In my laravel app I have a write connection to a write database, and a read connection to a dns server that is connected to a single read replica (as instructed here) In the past the dns server was ...
0
votes
0answers
25 views
Migrate a legacy application that uses MySQL replication
I have been working on the migration of a legacy ecommerce web application to a new server with far hardened security.
I have found an aspect with the MySQL server that I am not acquainted with and I ...
0
votes
0answers
14 views
Replicatation broker between master and slave with 'Can't find master key from keyring
I Have created new instance on AWS installed mysql on the server and made that server as Slave and added it to master.
Master is in different network.
1) Installed the keyring.
Started the ...
0
votes
0answers
36 views
Insert Missing Data in Slave Database
We have a master slave replication [MySQL 5.6]. However In slave database 2 rows is missing in one table. I've tried to solve this using Percona Toolkit as suggested here.
But pt-table-checksum ...
1
vote
2answers
37 views
Split read/write requests over different read/write datasources
Recently I have run some performance tests on the application I work on, and it turns out that it didn't do really well ( the problem is mainly between the back and the DB). So as investigating the ...
0
votes
1answer
23 views
MySQL replication without baseline data import
I've been reading about MySQL replication and all the resources I've looked at say that a data import (be it a mysqldump, or a raw data dump import) is needed before replication can start. I'm trying ...
0
votes
0answers
87 views
Set slave_exec_mode value for RDS
I am trying to figure out a way to set slave_exec_mode to idempotent on Amazon RDS.
I've checked the parameters associated with created DB instance on Amazon Console, but this parameter is not exit ...
0
votes
2answers
168 views
MariaDB slave replication stopped after slave upgrade to 10.1.41
After the recent MariaDB 10.1.41 update which happened on 01/Aug/2019, few of our slaves have stopped syncing relay logs from master which is on 10.1.40. Slaves which got automatically updated to 10.1....
0
votes
0answers
64 views
How to Un-Break MySQL Master/Slave replication
I had mysql master-slave replication working with mysql Ver 14.14 Distrib 5.7.27 -- totally awesome until it broke. Now, I'm not sure why but I cannot get it to work again. /etc/mysql/my.cnf has:
...
0
votes
0answers
24 views
In Mysql 8 user creation statements replicating on slave even after using replicate-ignore-db=mysql
Description:
`
Normally in mysql replication Data Control Language (DCL) statements won’t replicate into slave if we are configuring replication with replicate-ignore-db=mysql or replicate-wild-...
1
vote
1answer
54 views
Does pg_export_snapshot work across replicas?
This is probably of little importance, but it's possible in PostgreSQL to retrieve the transaction snapshot with pg_export_snapshot and restore it with set transaction to start a second transaction ...
0
votes
1answer
302 views
PostgreSQL logical replication slave - shouldn't it be read-only and available only for subscription updates?
I have database and table collection_city on one server. It has 21 rows. I have database and table collection_city on a second server. It also has 21 rows.
They both have this row:
tinker=# table ...
0
votes
1answer
184 views
PostgreSQL - PUBLICATION tries to copy the data which already exists in another database?
I have database and table collection_city on one server. It has 21 rows.
I have database and table collection_city on second server. It also has 21 rows.
They both have this row:
tinker=# table ...
0
votes
1answer
881 views
Postgres Logical Replication - “replication slot ”mysub“ was not created in this database”
I have two database servers 192.168.150.210 and 192.168.150.220
I created publication and subscription successfully for logical replication.
postgresql.conf file is modified on both servers.
...
0
votes
1answer
29 views
What will happen if master goes down in peer to peer replication?
In case of Peer to peer replication, if Master goes down, will the other two nodes continue synchronizing or not?
2
votes
1answer
64 views
Master mysq8 slave Mariadb 10.3 Error 22
Master (mysql Ver 8.0.16)
Slaventer code heree (mysql Ver 15.1 Distrib 10.3.15-MariaDB)
I have this error
Error 'Character set '#255' is not a compiled character set and is not specified in the '/...
0
votes
1answer
57 views
MySQL replication process parallel with user process?
I have process which executes query like below on Mysql(InnoDB) slave
INSERT ignore INTO user_profile_temp (some_fields)
select some_fields from user_profile
user_profile is bigtable of 8GB ...
0
votes
1answer
67 views
MySQL CLustering Options
I have two MySQL Database Servers i.e.
One is Active Server --> Master and second is Passive Server --> Slave.
And as we know we have 3-4 MySQL HR,DR Solutions / Clustering options.For example
01 : ...
0
votes
0answers
95 views
Physical and logical replication slots on Postgres (same time)
I wonder if it's possible to have a setup when changes from a single Postgres master streamed to two (or more) replicas same time, but some replicas to use streaming (logical) replication and some to ...
0
votes
2answers
116 views
syntax error for change replication
On a mysql 5.7 master, the following command generates syntax error.
CHANGE REPLICATION FILTER REPLICATE_DO_DB = ('mydb')
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual ...
0
votes
1answer
29 views
Where is pt-table-checksum finding this hostname?
The Setup: An EC2 instance running MySQL 5.6 locally replicating to RDS MySQL. The VPC IP address range is 172.0.0.0/8.
Somehow the slave got out of sync and I'm getting this error when I do SHOW ...
0
votes
2answers
269 views
Effect of --flush-logs on a slave mysqldump?
I have this database setup:
Master -> Slave A
I would like to accomplish the following:
Master -> Slave A -> Slave B
I have reviewed the documentation.
Master and Slave A are both in an ...
0
votes
0answers
26 views
Is there any global variable for PostgreSQL replication has configured or not
Is there any unique identifier or any global variable which can tell us if replication is configured in current PostgreSQL server. Other than this query
select pg_is_in_recovery();
The above ...
0
votes
1answer
50 views
Is there any unique identifier for PostgreSQL? How can the master identify its slave unqiuely?
Is there any way to have more than one PostgreSQL slave servers in the same system.
If yes, how come a master detect each server as different slaves from the below query
select * from ...
2
votes
2answers
284 views
Change user password on slave
Our users can only access the slave database.
How can I let them change their passwords on their own or when their passwords expire?
