ArcGIS9.3 solve Geodatabase Cannot create network dataset problem

1. Check the network analyst in the tool->extensions of Arccatalog

2. If it is already ticked, "error: cannot get to schema lock because there is already a lock exists" bug! Because the file to create the network dataset is being used by another program, close all other ArcGIS-related tools (ArcMap, and so on) to resolve.

(Reason: ArcGIS9.3 is a single-threaded, in ArcMap open the database inside the feature set, will generate a. lock file, this time can not be accessed through other threads, Baidu a bit, lock ensures that when a thread is in the critical section of the code Another thread does not enter the critical section. If another thread attempts to enter the locked code, it waits (that is, is blocked) until the object is freed. )