Replication is the process of sharing any level of information so as to ensure consistency between redundant hardware/software resources to improve reliability, fault-tolerance, and accessibility

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Best scenario for replication type

We are using SQL Server 2012 and we have the Main office server. All modification on the product pricing table is done through the Main office. We have 10 remote sales branches. Those remotes ...
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Does PostgreSQL support multi-threaded replication?

Is PostgreSQL replication single-threaded ? Are there any tools to achieve multi-threaded replication ? I'm asking this since Mariadb support this and currently I'm learning both these dbs.
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offload DB for reporting

Need your expertise on this.. I have a requirement like this, I have an application database which currently users are running SSRS reporting against this DB. Now I want to offload the reports by ...
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Huge size on mongodb's gridfs. Should I compact ?

I'm running mongodb and grid.fs to store small files (less than 20mbs). These are part of a replica set. I currently have more than 350000 files stored. I've noticed that the chunks collection takes ...
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Replication successful but slave skips certain quries

I am testing a MySQL master-slave replication. Here is the master my.cnf: log-bin=/var/log/mysql/mysql-bin.log server-id=1 innodb_flush_log_at_trx_commit=1 sync_binlog=1 Here is slave my.cnf: ...
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I have been tasked with Mysql Master-Master replication?

I have done some study and i came to know that Mysql master-master replication violates the ACID properties and there has been problem with primary key collision.Please Let me Know,Apart from these ...
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62 views

Master-Master Replication Duplicate Key

I have set two servers master-master replication mysql , i manage to set successfully but the problem is the duplicate key i got MASTER 1 Configuration /etc/my.cnf [mysqld] server-id=1 bind-address ...
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MongoDB only three of four shards being used

Using MongoDB 2.6, I've setup four replication sets: a, b, c & d: >rs.conf() a:PRIMARY> rs.conf() { "_id" : "name_of_replset", "version" : 1, "members" : [ { ...
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Postgresql Chained Slaves and Slave Promotion

So I have a setup like Master -> Slave1 -> Slave2. Slave1 replicates from Master and Slave2 replicates from Slave1. If I promote Slave1 to master is it possible for Slave2 to continue replicating from ...
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“Replicate” Table structures with sp_addscriptexec

In our customers environment is a massive central server (running SQL Server Enterprise 2008R2) and some distributed PCs (running SQL Server Standard 2008R2). The central server has a replication for ...
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46 views

MySQL replication of single DB to same server

I have a DB Server running CentOS 6.4 and MySQL 5.5 from RPMs (not source). I have dozens of databases but one of them is being hit quite hard with large selects which locks out other updates which ...
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64 views

Best backup strategy for MySQL (MariaDB) replication set

My main concern is getting a proper backup, even more so than a temporary outage. The data is golden. I've been doing reading through the documentation and a lot of the backup strategies seem to be. ...
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MySQL replication of single DB to same server [duplicate]

I have a DB Server running CentOS 6.4 and MySQL 5.5 from RPMs (not source). I have dozens of databases but one of them is being hit quite hard with large updates which degrade the performance of ...
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122 views

Percona XtraDB Cluster/MariaDB Galera Cluster - replication suddenly stops working, cluster thinks it is in “Synced” state

We are trying to populate an empty Galera cluster using myloader. We use the latest version of myloader from repo trunk, the command is as follows: /root/mydumper/myloader -d ...
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Mysql replication is enabled but stuck at “waiting for binlog to be updated”

I have set up replication between an existing database (server-id=23), and a new one (server-id=51). I have followed the steps in this stackoverflow question, but replication is not happening. On ...
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temp table (#sql-7a87_230c32.ibd along with its .frm) still exists on slave

I executed some alter statements on my master server, which have been successfully executed on master (now there is no temp table on master) and all alter also have been replicated on slave server ...
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When interrupting a query on a Master, does it replicate to the Slave?

In MySQL, when does the master send a query to the slaves? Here's a specific scenario that I'm trying to understand. Admin entered an update on master that took a long time to execute. Admin hits ...
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62 views

Database Mirroring and Replication in SQL Server 2008 R2

I have configured the mirroring and replication between 4 servers (A,B,C,D).i.e, Mirroring between A to B and C to D, Replication between A and C. The configuration was a success and I am able test ...
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69 views

High Availability in PostgreSQL with automated failover

I am currently working on designing an architecture for High Availability in PostgreSQL for a database of approximately 5TB in size. Also, I would like to re-direct my reads to a slave node(preferably ...
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How to make snapshot for new tables only

If there is a replication running for a large set of data, and I want to add one or more new tables, I normally add the articles to the replication and start the snapshot agent. Since there's a lot ...
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Oracle structural synchronization [duplicate]

I'm having two oracle databases. A is used for production, B is some kind of staging instance where people are preparing content that is brought to the production system over night. It is a fully ...
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SQL Server Cross Domain Transcational Replication

Has anyone got any documentation for doing/implementing Cross Domain SQL Server 2012/2008R2/2008 transactional replication document or steps (with screenshot or without screenshot) Thanks for your ...
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MySQL Database replication for high availability

configuration: 1 balancer 2 Azure machines(4 gb ram, 2 cores), with MySQL master-master replication enabled. X users connecting to the balancer to sync data. test: i've tested the MySQL ...
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trigger_file doesn't work

I set streaming replication. Replication works just fine but it doesn't care about trigger_file. I have nothing fancy there except all what many of tutorials advices: recovery.conf: standby_mode = ...
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How can I know whether postgres is currently running synchronous or asynchronous replication?

I see from ps that: postgres: wal sender process replicator X.X.X.X(38681) streaming 0/17AF5438 But is there any way for me to know whether it is synchronous or asynchronous? I made the relevant ...
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Creating Replicas Across Servers

I'm having some issues creating a replica set of my MongoDB. I have server A. Currently, it is setup as a local standalone replica. rs0:PRIMARY> rs.status() { "set" : "rs0", ...
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How To Prevent Replication Failure

If I become a MySQL DBA, will I had to deal all day with those kind of issues or do you have tips to prevent from breaking the whole replication? I received this message because I removed manually ...
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CREATE TABLE not issued on other masters

Database is created on all multi masters. Why CREATE TABLE doesn't being replicated to other masters. some explanations?
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106 views

MySQL Master-Master Replication not syncing

SETUP: I have a WAMP MySQL Master-Master replication setup on 2 machines with sync_binlog=1 for safety. Machine config: Windows Azure Standard 2: 2 core, 4GB RAM, Windows Server 2008, MySQL 5.6.12, ...
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Table Not Created On All MySQL Masters

Here is the multi master setup. Table is not created on middle master. log-slave-updates is not enabled in my.cnf file. Master 1 mysql> create database replication; mysql> use replication; ...
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Can Postgres synchronous replication stall a cluster if secondary/standby crashes?

In a setup with Postgres synchronous replication, let's say one of the secondary/standby machines crashes, will that lock/halt the master? That is, since the Postgres master always waits for ...
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replication error involving ignore-db

I have simple master/slave replication set up between two servers. The master has several DB's I wish not to replicate at this time, in fact there is only DB I am trying to replicate. I have several ...
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How to set up MySQL 5.6 Master- Slave Replication step by step

I am new to Mysql replication. I want to have 2 MySQL servers, a Master and a Slave, running on two Ubuntu 14.04 Computers. Their IP addresses will be 10.0.0.1 (Master) and 1.0.0.02 (Slave). I need to ...
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How do data checksums interact with streaming replication?

Data checksums are a new feature introduced in 9.3, and: there is a new GUC parameter "ignore_checksum_failure" which will force PostgreSQL to continue processing a transaction even if corruption ...
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Modify an Oracle Dataguard destination database

I'd like to set up some Oracle triggers to take action after rows are inserted, but I can't do this on our production database because it's controlled by a vendor. One alternative I was looking at is ...
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MySQL: What happens to the row when skip-errors=1062 is set

I found out that I can set skip-errors=1062 in the my.cnf but I need to know what happens to the row when the error happens. Does it get silently dropped? Or is that config option the equivalent to ...
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Replication Blocks Code Deployment

We have a database (SQL Server 2008r2) that is being transactionally replicated, namely tables, sprocs, views, indexed views and UDFs only, to another server (SQL Server 2014) as part of a cautious ...
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Sybase Replication rs_subcmp can ignore length?

I want to use rs_subcmp utility to sync one table. I've created a config file but I got the following error: Length mismatch for column #9 between the primary (50) and the replicate (100). ...
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50 views

PostgreSQL replication with fsync disabled?

I need to run PostgreSQL in-memory (for performance reasons), so I intend to disable fsync, which means that no writes will be sent to the WAL. However, as part of my scheme to meet another ...
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Postgres live backup

Goal: Maintaining a constant live backup of a postgres cluster. In case of cluster failure, backup/Secondary will contain most up to date view of Primary cluster. This is not a hot standby ...
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PostgreSQL manual way of sharding like behaviour

I've a main server with low space available and good internet connection that has a postgres database in production for a zabbix system. Also, I've another secundary server plenty of space but with ...
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131 views

MongoDB - Adding a new server to an existing replica set with auth enabled

Short version: Is there a way to add a new SECONDARY server to an existing production MongoDB replica set without downtime, and without temporarily disabling the "auth" and "keyfile" config settings ...
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MySQL incremental backups per database (not global)

While searching for free/open-source MySQL incremental backups solutions I have found a number of ways to do incremental backups and all of them seem to either rely on "logical" way of backups/restore ...
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MySQL Replication thread hangs on flush tables with read lock

I have a MySQL master/slave set up with row-based replication. At times of higher load we've been seeing replication halt and all slave thread activity commands just hang. STOP SLAVE, SHOW SLAVE ...
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Mirror database on same server instance for better read performance?

I am developing a somewhat big web application, which uses data which is aggregated using a crawler. The crawler is constantly writing to the database and updates many tables at the same time. For the ...
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Transactional Replication

SQL server 2008 R2. I have set up transactional replication on 40 tables in a database (other tables don't replicate). There was an issue in the morning and it is fixed now. I resynchronised the ...
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MySQL Create Table Statements not being replicated

I have a one master 5 slave MySQL replication setup. When I create a table on my master, it gets replicated on 3 of the 5 slaves. The other slaves however do not replicate the "CREATE TABLE" ...
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ORACLE 10.2.0.5 DB: How can I start replication of an existing schema into a new database with zero downtime

Please, note that I'm limited to Materialized view replication and datapump, so my question is whether the above can be done within my specified scope: Ensure no transactions in the database for ...
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Fastest way to set up MySQL replication from backup

Here's my scenario: I have a single database on network A that needs to be transferred to network B. on network B, I need a master-slave setup with 2/3 slaves. I need to run some significant updates ...
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How to create a secondary read-only reporting database with < 15 minute latency

We have a 2012 standard edition instance that is doing log-shipping of 2 related databases every 15 minutes to a secondary 2012 standard edition instance for DR purposes. Although it provides ...