In addition to locks on rows, SQL Anywhere also supports locks on tables. Table locks are different than schema locks: a table lock places a lock on all the rows in the table, as opposed to a lock on the table's schema. There are three types of table locks:
Table locks are only released at the end of a transaction when a COMMIT or ROLLBACK occurs.
The following table identifies the combinations of table locks that conflict.
Shared table locks
Intent to write table locks