DBA_LOGSTDBY_NOT_UNIQUE

DBA_LOGSTDBY_NOT_UNIQUE identifies tables that have no primary and no non-null unique indexes. Most of the tables displayed in this view are supported because their columns contain enough information to be maintained in a logical standby database. Some tables, however, cannot be supported because their columns do not contain the necessary information. Unsupported tables usually contain a column defined using an unsupported datatype.

Column	Datatype	NULL	Description
OWNER	VARCHAR2(30)	NOT NULL	Schema name
TABLE_NAME	VARCHAR2(30)	NOT NULL	Name of the table
BAD_COLUMN	VARCHAR2(1)		Y - the table column is defined using an unbounded data type, such as LONG or BLOB. If two rows in the table match except in their LOB column, then the table cannot be maintained properly. Log apply services will attempt to maintain these tables, but you must ensure the application does not allow uniqueness only in the unbounded columns. N - enough column information is present to maintain the table in the logical standby database but the log transport services and log apply services would run more efficiently if you added a primary key. You should consider adding a disabled RELY constraint to these tables.