Questions tagged [master-slave-replication]
The master-slave-replication tag has no usage guidance.
163
questions
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1answer
16 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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6 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
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0answers
10 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
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1answer
68 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
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1answer
24 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
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1answer
18 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
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1answer
33 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
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3answers
32 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 ...
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13 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
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0answers
23 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, ...
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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 ...
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1answer
24 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
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1answer
31 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 ...
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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 ...
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24 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 ...
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0answers
11 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 ...
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0answers
31 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
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2answers
34 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
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1answer
21 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 ...
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0answers
62 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
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2answers
129 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....
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43 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:
...
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0answers
17 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
43 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
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1answer
171 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
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1answer
97 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
552 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
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1answer
27 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?
1
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1answer
40 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
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1answer
40 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
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1answer
44 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 : ...
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0answers
79 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
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2answers
75 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
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1answer
26 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
192 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
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0answers
24 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
34 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
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2answers
251 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?
0
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1answer
208 views
pt-table-sync: syncing slave from master that has different credentials?
I have a MySQL slave under my full control and a master server where I have only read-only login. Also, logins are different. At some point replication have stopped due to some kind of problem.
I ...
0
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0answers
9 views
PostgreSQL streaming replication - secondary access
I have read that the streaming replication can be set up so the secondary receives the read only queries, but it is not clear to me how that is "turned on"? With Informix I used a connection manager ...
0
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2answers
377 views
Upgrade Antelope to Barracuda on Slave
I received a Last_Errno: 1118,
Last_Error: Error 'Row size too large (> 8126). Changing some columns to TEXT or BLOB or using ROW_FORMAT=DYNAMIC or ROW_FORMAT=COMPRESSED may help. In current row ...
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0answers
27 views
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 ...
0
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0answers
169 views
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 ...
0
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0answers
19 views
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 ...
0
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1answer
29 views
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 ...
1
vote
1answer
194 views
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 ...
0
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0answers
96 views
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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0answers
51 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 ...
0
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0answers
91 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: ...
0
votes
1answer
54 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 ...
