Entries in the System Catalog Tables

The table itself is fully described in entries stored in the system catalog tables for the database. Each table is assigned a table identification number or tabid. The tabid value of the first user-defined table object in a database is always 100. (The object whose tabid = 100 might also be a view, synonym, or a sequence.) For a complete discussion of the system catalog, see the HCL Informix® Guide to SQL: Reference.

A table can be located in a dbspace that is different than the dbspace that contains the database. The tblspace itself is the sum of allocated extents, not a single, contiguous allocation of space. The database server tracks tblspaces independently of the database.

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