Questions tagged [master-slave-replication]
The master-slave-replication tag has no usage guidance.
271
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Write latency for adding an index on read replica
This is a question that I've not been able to find any good documentation for on the internet.
I think it's a common industry standard that for tables with heavy writes, you add an index on the read ...
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Docker instances with MySQL replication and reboot
After a reboot of the system with two docker instances with MySQL replication, the slaves always breaks the replication with a Slave_IO ending not running.
Last time I had to redo all the process from ...
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53
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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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55
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Error 13117 while setting up master-slave replication with both DB servers being on the same Mac M1 machine
I am trying to create a master-slave replication with both the Mysql Servers being on the same machine.
The first mysql server, which I intend to keep as the master was installed using the Mysql ...
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1
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36
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How to identify binlog_format for a specific query?
I have binlog_format set to MIXED and it states that mariadb will decide whether to use ROW or STATEMENT based logging for each query. Where can I see that information for a specific query?
2
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1
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98
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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, ...
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7
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Change replication name when importing dump with master log position
I exported data from an existing database to bootstrap replication. When setting --master-data to 1 or 2 for mysqldump it writes the log position to the dump file. However the generated command does ...
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How/Why are in-flight transactions lost in synchronous replication in contrast to semi-synchronous
I'm reading through an article on why SQL databases are hard to scale and problems with ACID.
Here's the link to the short article: Link
Today's solution is usually post-write replication, where each ...
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26
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MariaDB replication works via MASTER_LOG_FILE, almost instantly fails using MASTER_USE_GTID
We have a weird issue with MariaDB version 10.4.28+maria~ubu2004 (the official binary release for Ubuntu 20.04 LTS).
We dumped the master data using mariabackup (we have a single database), and ...
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46
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Would MySQL Replication (master-slave) have prevented this problem?
I'm new to the idea of MySQL Replication (mainly because I've never really had data important enough to have redundancy until recently). Today I had a random crash of my MySQL 8 database with the ...
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What could be causing the delay in synchronous replication between the master and slave nodes?
I have 2 PostgreSQL 13 database, one acting as a master and the other as a slave, using streaming replication with synchronous_commit=remote_apply. This means that all data written to the primary ...
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Theoretical Question: What happens if replication is configured from primary postgres db on a deviated standby server?
I have a question: What happens if replication is configured from a primary Postgres server to a deviated standby server?
To explain more: Lets say I did a PITR restore from a 1-week-old backup on a ...
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444
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AWS RDS Can't complete Blue / Green changeover
I'm trying to do a Blue / Green changeover but it's failing with the error:
Switchover from DB cluster asamazon2-cluster to
asamazon2-cluster-green-xxxx was canceled due to external replication
on ...
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100
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Making backups with mariabackup from slave MariaDB. Best Way possible
I am trying to determine the best way to create backups from a MariaDB 1.4 slave, and I have the following questions:
Will creating backups affect the MariaDB slave replication and performance?
Is it ...
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90
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MySQL 8.0 replication lag high
Since we have upgraded from 5.7 to 8.0 (8.0.30-22), the servers don’t appear to be performing as well with the replication. The will frequently show 1 second repl lag, sometimes shooting up to 30 ...
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249
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MySQL replication - Follower stuck and behind
I understand there are lots of similar problems and threads but non of those solution helped me. Please read through the thread I will try to give as much information as possible:
I have setup a ...
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57
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MySQL replication not synced
I set up a replica between two MySQL servers. After my initial setup, the replication worked without any problem, but now they are out of sync.
On Master I can see:
Variable Valor
File mysql-bin....
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1
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96
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Set new mariadb replica server by copying database files from another replica
A few tables in replica server (db2) where 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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maximum number of physical replication on one server
I have a server with physical replication. It has been working very well till now.
I follow the procedure here : https://linuxhint.com/setup-physical-replication-postgresql/ to create the replication.
...
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257
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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/...
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1
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209
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Restart master in physical replication
I have 2 servers involving master-slave replication (physical replication).
I see the replication using select * from pg_replication_slots; there is a record saying :
user : rep_user`
application : ...
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160
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MySQL replication fails with permission error for unknown reason
Since 36h I'm struggling to setup a simple Master <-> Master replication with MySQL 8. None of the found solutions on the Internet works here and meanwhile I'm a bit desperate. Even the first ...
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149
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Read Replica block queries postgres
I've RDS PostgreSQL DB with read-replica. Also, have one script which frequently checks the blocking query but I faced one issue yesterday where the blocking query was a startup(backend_type)process ...
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3k
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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 ...
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88
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RDS Master MySQL AWS TO EC2 MySQL instance Replication
We have our master RDS MySQL in AWS , and slave set up done in EC2 instance, MySQL version 5.7, I have done the initial set up and replication working fine with single Database. In my case in master ...
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2
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92
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How to perform mysqldump and import simultaneously?
I have a master database and a slave one. Recently, the slave has not synced with the master. So, I tried running mysqldump command to the master:
mysqldump -h <master_host> -u <user> -p &...
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98
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Replication Lag while migrating a live database
I have a live database that is on a server(mysql 5.7) that I want to completely migrate to a droplet created on an infrastructure provider with (mysql 8.1). I would also like to have a master slave ...
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18
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how to well replicate PhpMyAdmin well
I want to upgrade my actual server with 25 databases.
My actual server with 25 databases are working full time with big data (each database has almost 5GB) and have a lot of new data each minutes and ...
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58
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MySQL : Huge table truncation in replication environment
We have 2 tables of size 186G and 63G that are no longer in use and needs to be truncated from the database.
I cannot directly run the truncate table statement on the master DB as it has 14 replicas ...
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163
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MySQL version Upgrade from 5.5 to 8 without no downtime/very less downtime
May I get instructions from anyone on how to upgrade MySQL from version 5.5 to 8 with no downtime/minimum downtime.
Make a plan like that:
Step01# 5.5 (Master)---> 5.7 (Slave): Slave will be ...
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1
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194
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Problem with seconds_behind_master in mysql replication with galera cluster
I have the next infrastructure of mysql servers:
Node1 - MySQL 5.1.X
Node2 - MariaDB 10.3.X
Node3 - MariaDB 10.3.X
Node4 - MariaDB 10.3.X
Node1 is a master replication node.
Node2 is a slave ...
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2
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331
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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&...
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2k
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Postgres max_wal_size and wal_keep_size parameter
I am setting up Postgres v14 database. I have a question related to the max_wal_size and wal_keep_size parameters.
According to the documentation:
max_wal_size ⇒ Maximum size to let the WAL grow ...
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aws documentation for DMS CDC is confusing
I am following this documentation https://docs.aws.amazon.com/dms/latest/userguide/CHAP_Source.PostgreSQL.html#CHAP_Source.PostgreSQL.Security to enable CDC using logical replication.
I have pglogical ...
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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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2
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371
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How do we switchover a slave to another master instead of promoting the slave to be the master?
We have a replication configuration wherein there are 2 Masters and 20 Replicas(Each master has 10 replicas). Now, we need to perform MySQL version upgrade on these instances. The approach for this ...
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192
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The best way to initialize table before logical replication
I am in the middle of setting up logical replication between 2 physical servers.
It involves 2 tables from the master with millions of rows. One table got 15 millions, and another one is 7 millions. ...
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2
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420
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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 ...
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2
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3k
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How to free up hard drive space after deleting millions upon millions of records in mariadb
We have an application where we are receiving information seconds apart, we record this information in a table that we call events, which currently weighs 240 GB, this is the largest we have so far.
...
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1
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351
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Fix mysql replication crashed due to underlying storage corruption
we have critical database server running on two virtual machines. one virtual machine crashed due to underlying storage problem and we had to move it to different storage medium and recover the xfs ...
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263
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Postgres13 logical replication degrading slowly
We're halfway through a postgres upgrade (from 11 to 13) and have run into a pretty unusual blocker, being that our 13 logical replica can't seem to keep up with changes from our 13 master. For ...
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execution time increases after turning off read replica in postgres
The task was assigned to me to check the performance of uploads and query execution separately for "read replica" turned on and turned off.
Surprisingly when "read replica" was ...
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How to avoid replication lag in case all writes on master and reads on replica?
I have stuck with the replication lag problem. I am trying to refactor my DB infrastructure.
The first step was read-write split. I used ProxySQL то implement it. Now I have masterDb where all INSERT ...
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1
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553
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Mysql replication Ignore specific table
I want to exclude some table for replication in slave db. How i can do it. what steps needs to be implement on master server or slave server?
I dont want anymore some tables in slave server. is there ...
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1
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121
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Replication from multiple masters to one slave
I have 2 Raspberry PI's and each run a MariaDB 10.3 server. Each has the same databases:
vennens
scheduler
On the slave I've configured the 50-server.conf file with follow contents:
master_pi1....
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Postgresql - increase WAL retention to avoid slave go out of sync with master
I've setup a master / slave Postgresql (13.4) group, 1 master and 1 slave, using WAL warm standby.
(refer: https://postgresql.org/docs/current/warm-standby.html#STANDBY-SERVER-SETUP)
The slave gone ...
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2k
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Postgresql - recover slave after out of sync with master using WAL
I've setup a master / slave Postgresql (13.4) group, 1 master and 1 slave, using WAL warm standby.
(refer: https://postgresql.org/docs/current/warm-standby.html#STANDBY-SERVER-SETUP)
But, due to some ...
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318
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MariaDB master-bin Log Rotation
I've just setup MariaDB replication with 2 slaves in Debian 11 (Bullseye). I'm a bit alarmed to see the file size reach such a size without log rotation:
-rw-rw---- 1 mysql adm 297394983 Dec 8 05:...
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What does running "show slave status" on a master server show?
We are using monitoring software that is throwing an error saying that Slave_IO_Running is returning No for replication on our master server. It is in fact true that when running show slave status on ...
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MariaDB replication error 1236: 'Could not find first log file name in binary log index file'
I received an error during MariaDB replication that I'm not sure how to fix. Replication is a new topic to me and I acquired these databases and their architecture through a job, so I've done some ...
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