Our development team uses Squirrel SQL to work mostly with Oracle databases. Recently, however, we've been running into problems. After spending a lot of time trying to understand and reproduce the problems, we've narrowed the symptoms.
SchemaInfo's loadColumns method gets triggered from a few places. Of interest, however, is the code completion plugin. The plugin seems to trigger the loadColumns on key strokes. That is all and well. But, loadColumns uses a class instance variable reference to DatabaseMetaData to grab column information about the table being worked on.
Now, with Oracle's JDBC drivers, having DatabaseMetaData accessed from multiple threads is inherently problematic. It causes some problems that, under the right load, take the entire database down. As disappointing as all that is, the question is whether SchemaInfo is right in making the assumption that JDBC drivers will provide a thread-safe DatabaseMetaData object.
Express Scripts, Inc.
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