MVStore: in some cases, CLOB/BLOB data blocks were removed incorrectly when opening a database.
MVStore: updates that affected many rows were were slow in some cases if there was a secondary index.
Using "runscript" with autocommit disabled could result in a lock timeout on the internal table "SYS".
Issue 603: there was a memory leak when using H2 in a web application. Apache Tomcat logged an error message: "The web application ... created a ThreadLocal with key of type [org.h2.util.DateTimeUtils$1]".