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Creating/editing materialized view log


Use the Materialized view log tab of Materialized View Log Editor to create/edit a materialized view log and specify its properties.

 

Log table name

Displays the name of the materialized view log table.

 

Schema

Use the drop-down list to specify the schema containing the materialized view log master table.

 

Master table

Use the drop-down list to specify the name of the master table for which the materialized view log is to be created.

 

Materialized View Log Editor - Editing Materialized View Log definition

 

Cache

These attributes can be used for data that will be accessed frequently:

RadioButton Cache

Specifies that the blocks retrieved for this log are placed at the most recently used end of the least recently used (LRU) list in the buffer cache when a full table scan is performed. This attribute is useful for small lookup tables.

RadioButton Nocache

Specifies that the blocks are placed at the least recently used end of the LRU list.

 

Logging

This group allows you to establish the logging characteristics for the materialized view log:

RadioButton Logging

RadioButton Nologging

 

New values

This group allows you to determine whether Oracle saves both old and new values for update DML operations in the materialized view log.

RadioButton Default

Specifies the default behavior for new values.

RadioButton Including

Specifies that both new and old values are saved in the log.

RadioButton Excluding

Disables the recording of new values in the log. You can use this option to avoid the overhead of recording new values.

 

With ...

Use the With group to indicate whether the materialized view log should record the primary key, rowid, object ID, or a combination of these row identifiers when rows in the master are changed.

 

CheckBox With object ID

Indicates that the system-generated or user-defined object identifier of every modified row should be recorded in the materialized view log.

 

CheckBox With primary key

Indicates that the primary key of all rows changed should be recorded in the materialized view log.

 

CheckBox With ROWID

Indicates that the rowid of all rows changed should be recorded in the materialized view log.

 

CheckBox With sequence

Indicates that a sequence value providing additional ordering information should be recorded in the materialized view log. Sequence numbers are necessary to support fast refresh after some update scenarios.

 

CheckBox With filter columns

Select this option to include the filter columns whose values you want to be recorded in the materialized view log.

 

Fields for materialized view log

This group allows you to specify the fields whose values should be recorded in the materialized view log for all rows that are changed.

 

To select a field, you need to move it from the Available list to the Selected list. Use the Move all to Selected Move to Selected Move to Available Move all to Available buttons or drag-and-drop operations to move the fields from one list to another.

 

To compile the object, use the corresponding iconCompile Compile item of the Navigation bar or toolbar.