9. A database access system as claimed in claim 8, wherein: said first means specifies a particular object descriptor as a removing object descriptor in said data manipulation language on deleting a particular object designated by said removing object descriptor from said object descriptor table; said database implementation section further comprising: fourth means retrieving said object descriptor table in accordance with said removing object descriptor to delete a particular entry corresponding to said particular object from said object descriptor table when a reference count is equal to a predetermined count, said reference count being representative of a count at which said particular entry is referred.
9. A database access system as claimed in claim 8, wherein: said first means specifies a particular object descriptor as a removing object descriptor in said data manipulation language on deleting a particular object designated by said removing object descriptor from said object descriptor table; said database implementation section further comprising: fourth means retrieving said object descriptor table in accordance with said removing object descriptor to delete a particular entry corresponding to said particular object from said object descriptor table when a reference count is equal to a predetermined count, said reference count being representative of a count at which said particular entry is referred. 11. A database access system as claimed in claim 9, said database access system comprising first and second computers, wherein: said first means is provided in said first computer; each of said second through said fourth means being provided in said second computer; and said first computer being connected to said second computer through a network.