Tagged Questions

2
votes
2answers
174 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
118 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
722 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
543 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
150 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
121 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
527 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 ...
2
votes
1answer
482 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 ...