Each connection to the database has its own isolation level. In addition, the database can store a default isolation level for each user or user-extended role. The PUBLIC setting of the isolation_level database option enables you to set a default isolation level.
You can also set the isolation level using table hints, but this is an advanced feature that is for setting the isolation level for an individual statement.
You can change the isolation level of your connection and the default level associated with your user ID using the SET OPTION statement. You can also change the isolation level for other users or groups.
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