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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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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57 views

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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651 views

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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2answers
289 views

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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41 views

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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78 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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1answer
167 views

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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57 views

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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1answer
369 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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161 views

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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170 views

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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134 views

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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85 views

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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40 views

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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56 views

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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1answer
54 views

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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2answers
168 views

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 ...
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1answer
39 views

How to read queries of master that sends to slaves?

I want to see queries that Master sends to slaves in Mysql ? Is there a way to see that ?
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96 views

PostgreSQL 9.3 slaves don't recognize hstore as a type

I am using the postgres built in replication with two slave nodes and a single master. On the master node (as well as the slaves) the hstore extension is installed. But whenever a query using hstore ...
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2answers
622 views

postgreSQL 9.3 streaming replication delay

I'm running a fairly simple WAL streaming replication setup between two postgreSQL 9.3 servers that are on a private 1Gb LAN, but recently I've noticed that there is an increasing amount of ...
2
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1answer
212 views

MySQL Seconds behind Master fluctuation

I have two servers set up in Master-Master with one additional Slave connected to the first master. Lately I've started getting alerts from monyog that Master 1 has a seconds_behind_master value of ...
0
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1answer
195 views

Consolidated realtime mysql backup with master/slave setup or binlog

I have 20+ mysql servers and their have low write requirements. So, I want to see if any way I can replicate the data/binlog from these servers to a single slave so realtime backup purpose. If I ...
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1answer
242 views

Sync postgreSQL with SQL Server database- on data change event

I have one PostgreSQL database and its data are being changed regularly. I want to sync all its data with my SQL Server database. One thing I can do is use query to check all required tables and ...
2
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1answer
214 views

MySQL Replication : Duplicate entries - SQL_SLAVE_SKIP_COUNTER or delete row?

I have a system which replicates one database to four slave servers. Every now and then, when traffic is high, one or more of the slave servers hits a duplicate insert error and the slave stops ...
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2answers
148 views

MySQL 5.6 showing wrong “second_behind_master”

mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 10.10.7.98 ...
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1answer
460 views

Design for active/passive Master-Master mysql Setup

I have a dozen virtual machines running application + mysql instances (version 5.1 up to 5.5). Due to the bad I/O of the virtualization I want to buy a physical server for mysql and move all mysqldata ...
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38 views

Consistent backup of large DB --single-transaction

I need to mysqldump a large DB (330 GB) in order to set up a slave for replication. Does --single-transaction allow me to dump the entire DB without shutting mysql down and keeping it down for the ...
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1answer
52 views

SQL server replication - Does not ask for the snapshot folder

SQL SERVER 2008 When I created a publisher for the first time, it asked for the snapshot folder path. I deleted that replication and tried to recreate the publisher. This time it doesn't even ask for ...
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51 views

Postgres Replication From Different Masters?

I'm getting a Postgres 9.3.3 install sorted out. My application is Drupal (so read/write), but low-traffic, so all application traffic is sent to the primary master. I have two sites (main and ...
0
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1answer
120 views

Change posgresql 9.3 slave roll password

I need to change the password on my slave posgresql server, because the person who set it up left the password the same as the password for the super user account on our other server. When I run ...
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1answer
94 views

Mongodb replica sets: why does my master server occupy more disk space than my slave?

I have two servers on my replica set. Let's call it the master and the slave, for the purpose of this discussion. The master was the original one, and the slave was replicated from that master. At ...
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2answers
72 views

Snapshot replication - How to detect when a snapshot has arrived on the Subscriber from the Subscriber DB

I have snapshot replication set up to on a server which publishes to a second server as part of a scheduled SQL Server Agent job. When the snapshot finishes, I would like to detect when each table has ...
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1answer
87 views

Fan-In replication 4 Master -> 1 slave

I am trying to merge 4 source db's (one for each region) into a global db. We use ID ranges as primary key on the tables in each region and so the merge should happen nicely. I have a fairly high ...
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2answers
51 views

Mysql Master Offline

In a unidirectional Master-Slave setup, should the slave be manually stopped in cases where the Master is offline due to Maintenance, Crash etc. ? Or should one just leave it so that it keeps trying ...
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129 views

How to use Select query just right after Insert on master in a query.?

I have a question on mysql replication. As usual, I deployed my db structure like the Update on master db, the select on slave. My questions. If I use SELECT query just right after INSERT in a query, ...
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2answers
133 views

MySQL Slave not updated

This might be a duplicate of questions on the same problem asked before. But all the suggestions to the previous questions do not seem to work in my case. I have set up Replication using SSH Tunnel. ...
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1answer
140 views

distrb.exe & Logread.exe using huge SQL.txt file in C:\Users\sqlsrvacct\AppData\Local\Temp folder

I have the following situation: SQL server 2008 R2 SP2 I have both the Distribution and Subscription database in this server. LogReader agent and Distribution agent are running in continuous mode the ...
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1answer
82 views

Impact of replication compression & encryption on performance, traffic?

What is the impact of MySQL compressed-slave-protocol on replication traffic? According to High performance MySQL it can lower the traffic to a third of the same replication without the compression. ...
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1answer
74 views

Determining replication traffic

is there any way to determine from server statistics* running MySQL, how much traffic(bits per second) WOULD replication consume between 2 servers, without setting-up the actual replication between ...
2
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1answer
558 views

Replication from EC2 Master to RDS Slave - Connecting to master

I am migrating my company's database from an EC2 instance to an RDS instance. I have already migrated a snapshot of data and am now trying to set up replication to get the data that has been added ...
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41 views

SQL Server DTC: is it possible to automatically replicate data that is created on Oracle DB?

I have a SQL server with a table that is spec'd exactly like a table in an Oracle database. What I would like to do is automatically copy the data from the Oracle table to the SQL server table... Is ...
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1answer
507 views

MySQL master master replication, safe to delete rows on both masters?

We have a MySQL (v5.1.61) cluster with two masters (and two slaves). We have a table logs with a primary key column logID. This log table grows rather huge, and we'd like to delete data from it. So ...
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125 views

Data Corruption on base backups created with wal-e?

I have streaming replication setup on Postgresql 9.1 with two machines on AWS EC2. The master has a cron job that does a daily base backup using the wal-e tool and uploading it to Amazon's S3 storage. ...
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38 views

Performance : MySQL replication or only one big server?

I'm searching about the best choice. We have to host a website with 10.000 - 20.000 visitors per day actually, growing. At the beginning, which would be the best : Having 2 MySQL servers (12 GB ...
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2answers
595 views

Postgres Streaming Replication lagging, using lots of CPU and little I/O

We have 2 dedicated DB Servers. One is master and other is its streaming slave. Postgres version 9.0.17. We have similar hardware on both servers and using 15krpm SAS drive in Raid 10 for Database ...
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1answer
187 views

MySQL - Best long read query solution within a replication based system

I'm working on a project where work in a queue requires a database read against heterogeneous table schemas (InnoDB/MyISAM). The queries constructed during the "read" process can result in 10-15 ...
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0answers
283 views

SQL Server Replication Monitor Throwing “Specified cast is not valid. (ReplicationMonitor)” Error

The publisher is running SQL Server 2008 R2 on a Server 2008 R2 box. The subscriber is running SQL Server 2012 on a Server 2012 box. I have tried launching the replication monitor from both servers ...
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1k views

Query to check if all replication articles are created at Subscriber SQL Server 2012

I am creating an automated build and test tool for our databases. In general there are two stages: - install databases in version A, install transactional replication - drop replication, update ...
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Is it possible for unique key to break master-master replication in mysql?

I have a master-master mysql setup with 2 servers running the exact same application making writes to such a table: CREATE TABLE `metric` ( `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT, ...
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50 views

Replication failure after old domain controller shut down

We changed domains on our SQL Server 2008 R2 about 6 months ago with no issues while the old domain controller was still up. The old controller was taken down today and our replications started ...