Unable to see tag history in database

there is a problem with Tag historian. When I create a tag, for example memory Tag A , and then configure the tag history parameter, and store the Tag history in DB , the rest of parameters keep default. (DB has been connected in Gateway configuration). I changed the Tag A’s Value to see how it stored in DB.

So I wen to Tools> Database QueryBrowser>history table. But I did not found the Tag A column.

Any insight would be appreciated! Thanks!

The tag historian doesn’t make a column for every tag being recorded. It records everything in one table in the intValue, or floatValue, or stringValue column, with a tagID to identify what it belongs to. Which is why should never query those tables yourself – always use the tag history binding or the system.tag.* script functions.