how to keep 2 vary large tables in sync
Posted on 2010-08-17
I am running SQL 2008 standard edition on Windows Server 2008 standard edition. I have a very large table that I need to keep in sync across data centers(ID and AZ). The table is using a column data type [TEXT] to store CLOB\BLOB data. In the past I have tried to use SQL server replication, but replication chokes on the [TEXT] column. I have been using the primary key value to insert into the stand by data center tables (ID). Basically taking the max value in the stand by server(ID) and then inserting everything greater than that value from AZ to ID. However now the customer is failing the application back and forth between data centers AZ and ID, and then reseeding the identity columns, so even though the data in the Idaho DC is newer than Arizona the PK value in Idaho is less than the last PK value written to Arizona. So the insert into where PK value > max(PKID) does not work. I tried using the date column, but then when they fail back, records end up missing data from the fail over. So in this case I will do a left join, to find the PKIDs missing, but I need to find a way to automate this……Any ideas experts?