Questions tagged [master-slave-replication]

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Some dates replicated with a +4 offset

I've set up replication between an EC2 instance as master and a MySQL 5.5 RDS instance as slave. Everything is (mostly) fine except for one odd thing: the dates in a transaction table are either ...
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1answer
126 views

Replication of databases with specific prefix on master

There are options to dynamically set variables on replication slaves, like replicate_wild_do_table and replicate_wild_ignore_table. But, are there any options for replication master to dynamically set ...
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152 views

Master DB Ran Out Of Space

My master server ran out of space today (at 20:22). My transactions logs ended up broken into multiple files: -rw-rw---- 1 mysql mysql 228M Jul 31 20:22 mysql-bin.000914 -rw-rw---- 1 mysql mysql ...
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1answer
1k views

MySQL Replication binary relay logs transfer too slowly

Master server MySQL 5.6.28 Ubuntu 14.04 8 core CPU Slave server Slave: MySQL 5.7.22 Ubuntu 18.04 16 core CPU Both of them have 64GB of RAM and plenty of disk space. What I did up to this ...
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663 views

MariaDB master-slave replication failover and failback

I'm trying to configure a DR instance of MariaDB (10.1.13) using master-slave replication. I was able to establish the master-slave relationship with GTID by locking the tables on master, backing up ...
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344 views

PostgreSQL Slave keeps xlog files with replication slot

I setup one master and two PostgreSQL servers (v9.6). In the master (and slaves) I set max_replication_slots = 2 and archive_mode is commented out everywhere. The replication works fine: There are no ...
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1answer
385 views

Why has deadlock behaviour changed between MariaDB 10.1.22 and 10.2.14?

Since upgrading MariaDB 10.1.22 to 10.2.14 our MariaDB slaves are encountering deadlocks that are not handled in less than 600 seconds thus the classic semaphore decision to crash the server. The ...
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0answers
2k views

Queries running very slowly in Amazon RDS PostgreSQL read-replica

We have been maintaining a project which has both web and mobile application platform. The backend of the project is developed in Django 1.10 and deployed in AWS. At the beginning, when there were ...
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1answer
270 views

Row-row based logging in a blackhole replication filter setup?

I am using two MySQL server instances on the same server to filter replication to a third external server. My filter slave is using the blackhole engine as described here: https://dev.mysql.com/doc/...
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1answer
115 views

Row based replication on slave where as statement based on Master

We have a master slave setup of MYSQL 5.6. Master and slave runs SBR replication where as slave is not writing binlogs. We need to enable binlogs on the Slave server but we want the binlogs to be in ...
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1answer
126 views

Restore server instance using logical backup and wal files

Is it possible to restore a database instance using logical backup and wal files? A senior SQL Server DBA asked me to implement below scenario in PostgreSQL took the logical backup using pg_dumpall ...
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1answer
701 views

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 ...
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2answers
263 views

slave mysql configuration is not stored

EDIT It seems that the problem is with my SSH connection, so I created a different question on serverfault. From what I understand so far, it that this problem is caused from the fact that the port ...
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1answer
2k views

Mysql replication broken due to 'Duplicate entry' with error code 1062 on slave server

Mysql Slave replication was working fine, but suddenly it has crashed due to duplicate entries error The slave SQL thread stops due to duplicate entries in MySQL DB, which I have kept in ...
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1answer
135 views

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 ...
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1answer
1k views

mariadb Unknown system variable 'server_uuid'

Im trying to setup replication between mariadb(10.1.31-MariaDB - MASTER) and mysql(5.7.12-log - SLAVE). After executed the start slave, I got the below error. Fatal error: The slave I/O thread ...
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1answer
93 views

Howto reliably ship WAL log files between master and slave

I have a replication master and a slave on two different computers. Actually both databases are running in docker containers, and their WAL archive directories are exposed to the host machine using ...
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1answer
40 views

Single slave for multiple masters in AWS AuroraDB

We are planning to use AWS Aurora(MySQL version) as our relational database. There will be three masters in different regions. We need the data from these masters replicated in a single slave. I think ...
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1answer
50 views

PostgreSQL Master server act as a slave for 2nd DB on new server

I have a strange situation I'm are trying to resolve. I've googled around but I haven't found a clear answer so I thought I'd pose it to the good people at DBA on StackEx to get a second opinion. We ...
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1answer
237 views

Is it possible to create a MySQL slave from a MariaDB master?

I need to create a MySQL slave instance which replicates the data from a MariaDB master. (I guess it won't work.) Any advice on how to create this replica architecture using MariaDB and MySQL? I am ...
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0answers
78 views

When the master db fails, the slave db will enable the write mode. How do I synchronize the master db with the information written to the slave db?

have two database. They are db1 and db2. db1 master, slave at db2. d1 have write/read mode. d2 have read mode. I have a problem like this: When the master db fails, The slave db will enable the ...
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55 views

MySQL Slave fails to flush privileges as Master gets flushed

0 down vote favorite I run into the issue with my slave mysql databases. When I flush the master server it fails to flush slave databases. What should be considering when adding a new user to MySQL.
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1answer
142 views

MySQL Replication Relay for Peer-to-peer replication for Multi-master replications [closed]

Any one knows about MySQL Replication Relay for Peer-to-Peer Replication for Multi-master replications? Please share if you know anything with example and syntax for multiple clients with as masters ...
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0answers
83 views

MySQL Lagging Slave Across Data Centers

We seem to have a strange issue from time to time during heavy write workload , a slave in a different data center starts to lag behind the master but when we STOP and START the slave the it starts to ...
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1answer
438 views

commit or rollback on a statement based replication, effect on auto increment id

How commit or rollback is safe on statement based replication in terms of auto_increment column? If I execute below queries, shoudn't there be discrepancy between master and slave in auto_increment ...
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1answer
413 views

Stored procedure in master slave replication

I have a master-slave replication for a schema products which is being replicated with binlog_do_db = products. one of the the tables in the master schema is being archived by calling a stored ...
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1answer
2k views

Can I use MariaDB as a replication slave for MySQL?

I've been a MySQL user/administrator for many years and I've been considering a switch to MariaDB. We have a statement-replicated setup with a MySQL slave and I've been thinking that one way to ease-...
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1answer
93 views

Do i need streaming replication slots as many of replicas in postgres?

Correct me if I am wrong but I’m thinking that if I have 4 different read only replica servers I need 4 streaming replication slots, one for each of them? Or all of them can you use one?
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195 views

MongoDB not performing well when set Read from secondary

I have a mongoDB database, with 1 primary and 1 secondary in replicaset(and 1 arbiter). Both the servers are hosted on aws on c4.2xlarge instances(with 1.5 TB of SSD on each). Mongo version of primary ...
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1answer
379 views

Mongo replicaSet dispersed over all continents

I have problem in operating mongo replicaSet which works on all continents. The primary data is located in Europe and want to replicate it distant locations in US, Brasil, Tokyo, Sydney and Dublin. ...
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1answer
562 views

Mysql database replication with geo-distributed servers

I am just a developer, who doesn't have deep knowledge in DBA. So need experts suggestions in this. I have two offline databases in two cities, I want to make a synchronization between two databases ...
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0answers
24 views

How to access a database hosted in a normal pc from the cloud?

[ Customer PC - MYSQL DB ] <--cloud--- [ Server - Web App ] [ Customer PC - MYSQL DB (master) ] <--cloud--- [ Server - MYSQL DB (slave) | Web App ] I have a mysql database that resides in a ...
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1answer
146 views

MariaDB | Sync Master with Slave in another Datacenter

We have a web application hosted on a dedicated server at Datacenter A. I am in the process of setting up a disaster recovery protocol and am considering the following. My current plan is to purchase ...
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3answers
732 views

Seconds_Behind_Master high even though Read_Master_Log_Pos and Exec_Master_Log_Pos are very close

From what I understand from https://dev.mysql.com/doc/refman/5.7/en/show-slave-status.html, seconds_behind_master is the difference in the timestamp of where the IO thread is currently writing in the ...
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1answer
267 views

bigchaindb set up and run cluster node error

I have been following the instructions given on: https://docs.bigchaindb.com/projects/server/en/latest/production-nodes/setup-run-node.html in an attempt to create a cluster. However I get this error ...
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1answer
500 views

Too much data queued in replication slots

Periodically we run a batch process that sequentially backups (delete, vacuum and later remote storage in AWS' S3) for a set of about 20.000 tables with the following shell script: #!/bin/bash ...
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2answers
88 views

Address of master PostgreSQL for replication?

What is the address (that goes to pg_hba.conf) for the master computer which is connected only to the internet which a slave VPS server will connect to for PostgreSQL replication?
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2answers
192 views

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 ...
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0answers
922 views

MySQL - Slave is not updating event SQL and IO threads are running

I tried to setup replication from my AWS EC2 instance to RDS Aurora, I tried this many times, But now my slave is not updating event the SQL and IO thread are running fine. And I found this ...
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1answer
49 views

Mysql master-slave replication makes no sence

I have the following values in my.cnf settings in a simple Master -> Slave setup: # MASTER my.cnf: server-id = 1 log_bin = /var/log/mysql/mysql-bin.log binlog_format=ROW binlog_do_db = db2 ...
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0answers
61 views

postgres 8.4: makeslave it's own master

For a DR test, I've tried to split the slave from the master. To do this, I edited the master postgresql.conf, turned off archive_mode and restarted. No problem. Now I'm trying to make the slave a ...
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1answer
269 views

MySQL Replication - Resync master after slave taking over

A few days ago, we've had to stop every machine for some maintenance. Two of these were a MySQL master-slave. After the restart, the master didn't get the service back online and, due to the critical ...
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1answer
1k views

how can be changed hot_standby parameter on postgres 9.6 aws/rds?

I have a postgres solution on aws/rds with a master and a read replica. master slave hot_standby on on transaction_read_only on on ...
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1answer
442 views

Can drbd be used for mongodb replication or active/passive setting?

From this guide we know DRBD can used for PostgreSQL Active/Passive setting: https://www.howtoforge.com/how-to-set-up-an-active-passive-postgresql-cluster-with-pacemaker-corosync-and-drbd-centos-5.5-...
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2answers
20k views

PostgreSQL service start failed on CentOS 7

Installed PostgreSQL using: sudo yum install postgresql-server postgresql-contrib PostgreSQL version: 9.2.18 When start service: sudo service postgresql start Got error: Redirecting to /bin/...
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122 views

Replicate Specific Tables with fully qualified statements removed

Currently we have a replication system that is a master to slave, which that slave is also a master. We are replicating our web server to our stats server so we can report on users traffic as well. We'...
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2answers
2k views

Post Mortem Analysis: PostgreSQL replication failed

We have a PostgreSQL 9.4.9 production server which was replicating to a slave instance, but today I discovered that the instance is out of sync! The obvious actions would be to recreate the slave, ...
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1answer
1k views

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 ...
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1answer
501 views

Can I create a table and database on a slave without breaking replication?

I have One Mysql master server and Slave server running on ec2. The replication is working fine. Now I need to make some changes. I need to add new slave server to the current replication loop. ...
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1answer
1k views

How does one scale out with master-slave replication?

To my understanding, a master-slave replication might be set up where clients can read from multiple databases. However, they can only write to the master. I believe this helps guarantee ACIDity. I ...