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Oracle 11g Streams Implementer's Guide by Eric Yen, Ann L. R. McKinnell

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Tag! — you're it

For eons, mankind has used a wonderful, yet simplistic method to mark, differentiate, and/or identify objects. What is this method? They put a tag on it. We put tags on retail merchandise to mark a price, size, inventory id, and so on. We put little tags on maps to show where something of significance has happened. We put tags on presents. We even put tags on toes (morbid, but true). Whatever the reason may be, we tag it. These tags make it easier for us to identify something "special" about the object. Oracle Streams is no different. Streams uses tags on LCRs to help the various Streams processes identify changes that need "special" handling. This tag is of a raw data type and can store a value up to 2000 bytes. If you are familiar ...

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