事务 X 试图通过 JDBC 访问事务 Y 创建的对象

Question

I have JDBC code which talks to Sybase IQ. One of the thread is loading/update data into one Sybase IQ table say t1. Other threads will try to fire SQL query on table t1 after the first finished loading/updating data.

Write thread:
Create table t1, load/update data into t1, commit to t1.

Read thread(s):
Read select query from t1

I am getting the following error as mentioned in here :

Transaction 156593 attempted to access an object created by transaction 156608.
-- (db_txnInfo.cxx 690)
Sybase error code=21, SQLState=”QDA11”

I am not sure where is the problem I am committing after every load. Every thread uses different connection read thread fires only select query then where is the problem how do I debug? I am new to Sybase IQ and JDBC.

Answer 1

You may need to issue a commit in the second thread. Or for the read-only thread set auto-commit on.

I'm curious, does the error happen on the first select from the second thread, or does it only happen after the first select?

In IQ, even a select statement can generate a transaction (which it should really handle a bit better as IQ is supposed to create "snapshot versions" to give a transaction a logitudinally consistent view on the data for the life of a transaction ... IQ has some F$%@#$%ng ugly warts by the way)