migration via replication for large DB?

2010-07-25 Thread Geoff Galitz
Hello. I need to migrate a master and slave to new hardware. The DB is approx 50G on disk and my time window for downtime is approximately 4 hours. My question is, is it advisable to do a mysqldump from the old master and then load on the new master and slave, or is it faster to just set

Need Help Writing Simple Query

2010-07-25 Thread Mark Phillips
I have been away from sql for awhile, and can't seem to figure out how to write a simple query for two tables. Table 1 has many columns, two of which are hID and vID. Table 2 has two columns, ID and name. The hID and vID in table 1 correspond to the IDs in table 2. I want to make a query so I get

Re: Need Help Writing Simple Query

2010-07-25 Thread Nguyen Manh Cuong
Hi Mark, Please test this query: select test1.*, (select name from test2 where test2.id=test1.`v_id` limit 1) as name_1, (select name from test2 where test2.id=test1.`h_id` limit 1) as name_2 from test1; - test1 table: col1v_idh_id America 1 2 - test2 table: id name 2

Re: Need Help Writing Simple Query

2010-07-25 Thread John List
On 07/25/2010 09:29 PM, Mark Phillips wrote: I have been away from sql for awhile, and can't seem to figure out how to write a simple query for two tables. Table 1 has many columns, two of which are hID and vID. Table 2 has two columns, ID and name. The hID and vID in table 1 correspond to the

Re: migration via replication for large DB?

2010-07-25 Thread Rob Wultsch
On Sun, Jul 25, 2010 at 12:55 PM, Geoff Galitz ge...@galitz.org wrote: Hello. I need to migrate a master and slave to new hardware.  The DB is approx 50G on disk and my time window for downtime is approximately 4 hours. My question is, is it advisable to do a mysqldump from the old master