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Questions tagged [master-slave-replication]

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Can i control access end point When some table data changed In Mysql Semisynchronous Replication

I'm trying to set up One master Multi slave in MySQL 5.7 My architecture is like this. Master - First slave(sync) Second slave, Third slave, Fourth slave, Fifth slave(async) My question is, If ...
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1answer
122 views

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 ...
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0answers
134 views

How to get the Slave commit timestamp using MySql replication?

I've been looking for ways to collect information about the replication delays on MySql 8. I found an alternative solution, but I imagine there's a more straightforward way to do that. By reading its ...
2
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1answer
322 views

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 ...
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0answers
58 views

Why slaveDelay is not respected by mongoDB replica?

I've seen related article below: Mongodb replica config slaveDelay but data still sync immediately My secondary node is set to be delayed by 3600 seconds: ... "members" : [ { "_id" : 0, ...
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1answer
49 views

Seconds_Behind_Master alternates between 0 and a number x

I have a slave server with mariadb 10.3.10 on debian 9. For several days the server has been working correctly, Seconds_Behind_Master was always kept at 0 indicating that it was properly synchronized. ...
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1answer
56 views

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 ...
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1answer
68 views

What's the difference between Replicate_Wild_Ignore_Table & Replicate_Ignore_Table?

In my site's master/slave setup: Replicate_Wild_Ignore_Table = %.cache%, & Replicate_Ignore_Table is empty. What's the difference between the two?
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1answer
54 views

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 ...
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1answer
171 views

Does the row locking on slave database also apply to master database?

In a transaction, for example, START TRANSACTION; SELECT count(*) as count FROM `order` WHERE user_id = 25286 LOCK IN SHARE MODE; INSERT INTO `order` (`id`, `user_id`, `product_id`) VALUES (NULL, '...
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0answers
164 views

Cascading binary replication to logical postgres

Im using Postgres 10, and I was wondering if its possible to cascade a logical replication from a binary slave replica? I am looking to have databases with the same data but indexed in a different way ...
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1answer
228 views

Create a mysql replication from multiple master and single slave server? [closed]

How to create mysql replication with multiple master server and with single slave server? how to edit the "CHANGE MASTER TO MASTER_HOST='12.34.56.789',MASTER_USER='slave_user', MASTER_PASSWORD='...
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1answer
38 views

Mariadb 10.1.13 - log positions similar but “seconds behind master” is behind

The setup I have is a master/slave replication, both running Mariadb 10.1.13. On the slave I noticed that the Seconds_Behind_Master parameter is showing a delay due to some form of lagging, but the ...
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1answer
174 views

Mysql Slave Claims to be Running but New Records Not Appearing and No Delay

I've created a new mysql master and a slave. My master is also a slave of another running instance. The replication between those two works fine so I don't believe my issue is there. I created a dump ...
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1answer
27 views

MySQL how to migrate to new server without data lost?

I'm using AWS RDS, with 1 master & 1 slave. Just now I alter 1 of the table and hangup halfway, so I force stop the process. Now the database got some problem. Let say I wanted to instantiate a ...
2
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1answer
93 views

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. ...
2
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1answer
338 views

Master-slave replication doesn't work on PostgreSQL 9.6

I tried to create a master/slave configuration with two servers and Postgres 9.6 I modified master and slave postgresql.conf in /etc/postgresql/9.6/main Same for master and slave: data_directory = '...
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1answer
27 views

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
98 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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1answer
108 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 ...
2
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1answer
760 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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1answer
547 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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1answer
261 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
274 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
1k 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
231 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
101 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 ...
0
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1answer
114 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 ...
1
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1answer
636 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
192 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 ...
1
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1answer
98 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 ...
0
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1answer
902 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
65 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 ...
0
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1answer
38 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 ...
1
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1answer
49 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 ...
1
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1answer
154 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
75 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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0answers
48 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
109 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
75 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 ...
0
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1answer
332 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 ...
0
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1answer
332 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 ...
2
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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-...
0
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1answer
89 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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0answers
168 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 ...
0
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1answer
254 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. ...
1
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1answer
489 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
122 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 ...