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  Oracle Replication Tips by Burleson

Oracle materialized view mlog$ table

The mlogs$_<table_name> is the materialized view log created with the CREATE MATERIALIZED VIEW LOG command.  Note that materialized view log tables using primary keys also have rupd$_ tables, as is the case in this example.  The rupd$_ table supports updateable materialized views (covered in Chapter 4), which are only possible on log tables with primary keys.

The materialized view logs are just like any other table and can be queried. 

SQL> desc mlog$_bonus;
 Name                         Null?    Type
 ---------------------------- -------- -------------
 M_ROW$$                               VARCHAR2(255)
 SNAPTIME$$                            DATE
 DMLTYPE$$                             VARCHAR2(1)
 OLD_NEW$$                             VARCHAR2(1)
 CHANGE_VECTOR$$                       RAW(255)

Execute a select count(*) to determine whether there are changes waiting to propagate.

SQL> select count(*) from mlog$_bonus; 


This is an excerpt from Oracle Replication By Rampant TechPress (only $19.95).  You can click here to order a copy and get instant access to the code depot:

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