0
votes
0answers
56 views

Database design for large incoming data

I've been tasked to design a database to handle a large volume of incoming traffic from sensor readings, possibly 1,000s an hour when it's at full strength. Each reading will be relatively short - ...
0
votes
1answer
35 views

mongodb - “replication oplog window” possibly reduced due to profiling - when profiling disabled no change?

PROBLEM I have a 3 member replica set (no sharding) running mongodb version 2.4.8. Using MMS (Mongo Monitoring) I can see that on 7th July 2014 at 12:00 my "replication oplog window" dropped from ...
0
votes
1answer
67 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. ...
0
votes
0answers
33 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 ...
1
vote
0answers
221 views

Postgres database zero down time production deployment

I need some idea about how I can deploy a financial application in production environment using PostgreSQL DB with zero down time. I have two servers in Master-Slave design. Currently I am giving ...
2
votes
1answer
83 views

How can I compare the server impact of transaction replication

We are developing a system that must extract data from an existing SQL Server 2008 R2 cluster. One of our design goals is to limit the performance impact on that cluster as much as is practical. ...
1
vote
1answer
40 views

Moving large database to another drive, how to measure performance before, and setup some type of replication for fast fail back?

Sorry if this is kind of more than question at a time, but here goes. Running SQL Server 2008 on windows server 2008 as well. We have a large database just over 200gb right now (it holds images of ...
0
votes
1answer
75 views

SQL Server 2000 Replication, Performance, and Query Priorities

I'm a developer and wanting to confirm the following: Does anyone here have experience with SQL Server Replication (transactional) on 2000? We are trying to convince the DBAs to allow this in a ...
5
votes
2answers
2k views

MySQL replication: most important config parameters for performance on slave server?

I'm setting up a mysql master-slave configuration, where slave is located on a much weaker sever. Since, if I understand correctly, slave only works on updates/inserts, what are the most critical ...
2
votes
2answers
473 views

Bandwidth comparison between log shipping and transactional replication

Which technique uses more network bandwidth: Log shipping Transactional Replication Can some one share any benchmarks for the same ? What would be the Memory and I/O impact on the Primary server ...
0
votes
2answers
1k views

Some queries slower in MySQL 5.5 than 5.0?

We have an exceptionally inefficient process (1.3 million selects, 232k updates) that I'm now recoding to be 1 select and 50 updates. In the meantime, though, today's process ran. We recently updated ...
2
votes
2answers
1k views

Will an ALTER TABLE ADD COLUMN on a slave break replication?

I need to add a last_modified column to a MyISAM table tbl_items. The crux of this problem is that tbl_items houses several gigabytes of data. Also of note, I am using a master-slave deployment with ...
3
votes
2answers
273 views

Reinitializing Subscription Performance

I have 4 Servers, Servers A, B, C, D. Server A publishes a Replication instance, and Servers B, C, D have Pull Subscriptions to it. Server B's subscription needs to be Reinitialized, but I am ...
1
vote
1answer
243 views

MySQL replication risks for the master

I have a production MySQL server, fairly heavily loaded with an INSERT-only load on one of its databases. I'd like to attach a non-production (sitting on my desk, more or less) replication slave to ...
2
votes
1answer
950 views

SQL Server Replication causing locks on table

we have three MSSQL 2005 servers (database is set to compatibility level 80 for legacy reasons) which we have just set up Transactional Replication w/ Updateable Subscriptions on. Two which are ...
3
votes
1answer
852 views

Replication slows down on massive deletes

First of all, I'm not a DBA, but I'd like to get advice how to deal with the following issue. We have few database servers based on SQL Server 2008 R2 SP1. They have been organized as shown below, so ...