Questions tagged [master-slave-replication]
The master-slave-replication tag has no usage guidance.
285
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Should I write to MySQL slave (replica) for reporting?
I intent to put reporting/analytics database on slave and run job scheduler every night to aggregate and insert data from operational database to reporting database.
Should I do this or I have to ...
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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 ...
CommunityBot
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1
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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 ...
CommunityBot
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2
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36
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MySql binlog file getting truncated/shrinked during replication
There is a master-slave setup of a mysql db. The replication was going on fine until pos y when an error was thrown Client requested master to start replication from position > file size.
I tried ...
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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 ...
CommunityBot
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2
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1
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589
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sync_binlog different for master and slave
Is it fine if sync_binlog is different for master and slave?
For my system I can see master has sync_binlog=1 and slave has sync_binlog=0.
CommunityBot
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1
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360
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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 ...
CommunityBot
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3
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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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1
answer
441
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Can I stop replication of create/drop index statement on one slave of Mysql 5.6?
I have this cluster where master and slave uses same indexes but one of the slaves has some extra indexes (large machine which runs some analytics queries).
So I have to maintain two sets of indexes. ...
CommunityBot
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0
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14
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Need to build MySQL replication with TSL cert between onPremises server as Master and Azure flex server as Slave
I have a requirement
Need to build MySQL replication with TSL cert between onPremises server as Master and Azure flex server as Slave .
On Master & slave host ssl is enabled . also i have followed ...
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1
answer
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Load balancing between 2 servers using MySQL Router
I want to setup a simple master-slave MySQL replication. I also want to balance the load between the 2 servers. Can I use MySQL Router 2.1 for that purpose? As I read the official documentation, it ...
CommunityBot
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0
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60
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Failed to start patroni
I am trying to configure patroni and etcd. Etcd is working fine, but patroni is failing to start. I have 3 servers, I have installed patroni and etcd on each server. When I try to start patroni on ...
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Rename the slave Postgresql database name
I have Master-Slave streaming replication working well with postgresql 13. I created the slave from the master successfully and data is synching nicely to the slave. Can I just change the name of the ...
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Setup proxysql read-write split with both galera cluster and master slave replication
I have the following setup:
Three node galera cluster (galera-1, galera-2, galera-3)
galera-2 is master to slave-1 (master-slave replication)
slave-1 is master to both slave-2 and slave-3
slave-1, ...
CommunityBot
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2
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757
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MySQL master slave replica interrupts after service restart or reboot
I've been using the master slave replica to keep a mySQL database and its disaster recovery perfectly aligned.
I noticed that unfortunately every time the mySQL service restarts, or one of the server ...
CommunityBot
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1
answer
309
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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 ...
CommunityBot
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1
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Slave stoping with Last_SQL_Errno: 1032
I have added an extra Slave server to an existing MySQL Replication. The Master server and the old Slave server are working fine without any issue, but the newly added server is stoping with the ...
CommunityBot
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1
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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 ...
CommunityBot
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2
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389
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High Load MariaDB Cluster (Galera Multi Master Replication) - Same hardware needed for Slaves?
My Galera Cluster is on very high load.
To run it fine, I´m using strong hardware and for sure a lot of custom MariaDB settings and custom OS tweaks.
Now, I want to add Slaves to get "realtime&...
CommunityBot
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1
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PostgreSQL - Replica Recovery Process Stuck frequently (epoll_wait taking too much time)
We have Master Slave Setup with Asynchronous Streaming Replication (Replication Slots). Frequently our Replica's entire Postgres processes seems to be doing nothing (or stuck?). Since ...
CommunityBot
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0
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28
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Switch slave to new master
I have one master and 2 slaves in a mysql replication mode. All slaves are synchronised to the actual master.
Because of space disk problem, I have to shutdown master_old to switch the first slave to ...
2
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1
answer
350
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Cross-Continent SQL High-Latency Data Synchronization
How would one go about synchronizing a MySQL database cross-continent, while keeping the distributed application using the DB running fast (<0.2s page loads) ?
My database contains about 2.5GB of ...
CommunityBot
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1
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396
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MySQL slave stuck on Applying batch of row changes (read)
Might be duplicate of:
MySQL slave stuck on Applying batch of row changes (write)
or
MySQL8.0 Replication Got Stuck "Applying batch of row changes (delete)"
I am trying to use MySQL 8.0.26 ...
CommunityBot
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1
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659
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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 ...
CommunityBot
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1
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Mysql replication fails when the master's binary log increments
I am currently running 2 instances of 8.0.31 MySQL Community Server on two virtual machines. These are set up with one way replication. The replication runs fine once set up, but at some point it ...
CommunityBot
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2
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Importing a large mysql dump while replication is running
So we have a simple master/slave mysql replication running between two CentOS Servers.
The master has multiple databases. eg..
Database1
Database2
Database3
The issue is we have a mysql dumpfile ...
CommunityBot
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1
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380
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replicate-wild-do-table=channel_name:db_name.% doesn't work in MySQL 8.0 for channel based replication
I am trying to configure a replication topology where there will be one slave which will connect to two masters. Percona Server 8.0.25.
Master1- main master
bkp_server - slave to master1 and ...
CommunityBot
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1
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66
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MySQL NDB Cluster Community - High memory utilization by mysqld only on source/replica nodes
I have two MySQL NDB community clusters 8.0.30, each with 3 VMs
Cluster#1_VM1: mysqld + ndb_mgmd
Cluster#1_VM2: mysqld + ndb
Cluster#1_VM3: mysqld + ndb
Cluster#2_VM1: mysqld + ndb_mgmd
Cluster#2_VM2: ...
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537
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find error log for streaming replication
Recently the streaming replication fails after I restart the primary. I can not find the record using select * from pg_stat_replication
Now, I want to see it from the system log file at /var/log/...
CommunityBot
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2
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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 ...
CommunityBot
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1
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345
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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 ...
CommunityBot
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SOLVED - Mariadb replication Master Slave fail with error code 1595
I've a strange problem.
A Mariadb replication start failing since this morning.
Until today everything works fine from month.
This is my scenario:
I've a server in a DC which is the master, and a ...
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2
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could not receive data from WAL stream: ERROR: requested WAL segment XXX has already been removed
Heads up - I have never dealt with postgres replication before; our DBA is on leave in Europe ATM.
It appears that something broke our replication a week ago; the master has 121 current wal files, ...
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1
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425
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Finding temporary table name in MariaDB
As I reported some days ago to MariaDB bug tracker the following bug: https://jira.mariadb.org/browse/MDEV-17420, slave replicas with version 10.2.x are leaking temporary tables on MyISAM files.
Our ...
CommunityBot
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1
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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 ...
CommunityBot
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SQL Server Merge Replication using Web Synchronization - RESUMING SYNC
We are using MSSQL Merge Replication using Web Sync over extremely slow connection with many SQL Express subscribers.
For some reason, occasionally, connection is dropped and the subscriber is trying ...
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1
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437
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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. ...
CommunityBot
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425
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Can MongoDB manage balancing between the Mongos Dynamically using TCP Balancer
If I have a business where I maintain 10 applications and I need to divide the request load of these 10 applications between 3 Mongos Dynamically.
Like the TCP Loadbalancer need to connect to MongoDB ...
CommunityBot
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1
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Mongodb replica set primary and secondary node conf fail when one slave is down
In my env, I had created MongoDB replica set conf for high availability so one server fails should be handled by other also in my conf I have 3 DB server and 1 arbiter too but,
my slave's server ...
CommunityBot
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Master slave replication with different mysql version is on both slave and master
Currently, we have MySQL master-slave replication. Both master and slave servers have Mysql 5.5 Currently I need to add one more Master server having version 5.7.
Is it possible to add Multiple ...
CommunityBot
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2
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785
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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 ...
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Is there a difference between Range Type Partitioning & Temporal Data Tables (System-Versioned-Tables) in Maria DB 10.11.5?
I have a migration project (from Oracle) to Maria DB 10.11.5 (my choice).
The needs of the database server are not ordinary. The database is to write to disk the results of software bots which are ...
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49
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MySQL Master Slave Asynchronous GTID Replication Failover over ProxySQL with little downtime
This is a production setup and I have to perform a failover from Master A to new potential master B.
MySQL Version is 5.7 and CentOS 7 is the OS.
I have a simple master slave setup with A as Master ...
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1
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302
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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 ...
CommunityBot
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1
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How to monitor mysql master - slave replication in windows os and failover in event of failure of master
I have a master and 3 slave all on windows OS.
I need a tool I can use to monitor replication and failover to a slave incase the master is goes down. What tool do you recommend.
I prefer open source ...
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204
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Set new MariaDB replica server by copying database files from another replica
A few tables in replica server (db2) were marked as crashed. We copied all database files (whole /var/lib/mysql) to another server (db3) in order to repair those tables. In the end we had to use pt-...
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Why data files are different on master slave nodes?
I recently set up a Postgres15 master-slave (Primary-secondary) cluster on 2 nodes. At the time of starting, I ensured that data files are exactly the same on both the nodes. The size of the DB is 1....
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Replication Error: Last_IO_Errno: 1236 - Replicating two different channels from same master
Need little help with a production issue.
Case: I had to migrate two schema from MasterA to MasterC. It would have been a simple exercise but because it was decided to migrate schema1 first and later ...
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133
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Regarding catalog_xmin in Replication slot
Definition of catalog_xmin from postgres Documentation:-
The oldest transaction affecting the system catalogs that this slot needs the database to retain. VACUUM cannot remove catalog tuples deleted ...
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1
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Postgres hot_standby_feedback supersedes or uses vacuum_defer_cleanup_age?
According to this web article, the hot_standby_feedback parameter makes use of the vacuum_defer_cleanup_age parameter to calculate when it will send updates? According to the postgres documentation, ...
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