Hello, I am using SQLAnyWhere 184.108.40.20652 and am connecting an Oracle 10g database to an UltraLite db on a handscanner that runs Windows CE. I have had no issues with my synchronization until recently. I was setting up a new scanner, and after running my initial synchronization I noticed that the number of records being downloaded where not changing. I am using timestamp based downloads that is utilizing shadow tables. I noticed that in the
I have tried looking through the forums but have not found anything that resembled my current issue. If anybody has any suggestions as to what I can try, I would appreciate it very much. Thank you in advance.
asked 28 Jan '13, 17:43
The issue is a long-running transaction against the consolidated database. In order for sync to download the rows that have changed, it can only look at completed transactions. If there is a long-running transaction, the last-download time (LDT) cannot advance until it completes. Why? Because that transaction may have last_modified (or equivalent) logic that has dates set to the starting time of the transaction. To maintain robust sync, there is no choice but to defer the advancement of the LDT.
I suspect the reason why it worked when you shut down ML server is that a long-running sync was in progress, or hung. Or at the same time the long-running transaction finished.
When the LDT fails to advance, please use your Oracle (or RDBMS-specific) admin tools to look for long-running (eg. batch) transactions. Even if the transactions do not affect sync tables, by default they will defer the advancement of the LDT.
answered 29 Jan '13, 09:46