Manual Reference Pages - GENEZZO::TABLESPACE (3)
Genezzo::Tablespace - a class that defines a tablespace, the relationship
between a collection of files on disk and a set of tables in the
A Tablespace is a storage unit for a table or many tables, and a table
only exists in a single tablespace. Each tablespace is composed of
one or more datafiles, and each datafile is only associated with a
The tablespace object (tso) is used to co-ordinate several major
file/storage subsystems. For example, each datafile has local state
information (free space, used extents) controlled by space management
(SpaceMan::SMFile), but the overall information about a table and its
datafiles is stored in the dictionary tables. Finally, the buffer
cache is used to mediate access to the actual disk files, dealing with
issues like locking, concurrency, and caching. When a table is
updated, it uses the buffer cache to write to a datafile. If the
current datafile is full, the table will use the tso to find the next
available file, and the tso will update the dictionary to note that
the file is in use. The tso also propogates storage management
preferences stored in the dictionary to the file space management,
controlling extent size growth.
filearr, used, unused: should match dict _tsfiles fileidx - done 3.21?
notion of buffercache associated the tablespace object possible multiple active bcs, with different characteristics/semantics, e.g. a bc for temp space with different blocksize, lacking txn recovery? Need to guarantee that all clients of a tso use the same bc for consistency/locking/txn support
use compatibility matrix to drive automatic upgrade capability
Jeffrey I. Cohen, firstname.lastname@example.org
Copyright (c) 2003-2006 Jeffrey I Cohen. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Address bug reports and comments to: email@example.com
For more information, please visit the Genezzo homepage
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