Communicator e3000 MPE/iX Release 6.5 Express 2 (Software Release C.65.02) (30216-90322)

Chapter 4 61
Increases in Limits
Large Size Datasets in TurboIMAGE/iX
Migration Utility
Existing databases can be moved to support large datasets through the migration utility provided
with the solution. The migration utility is DBBIGSET.PUB.SYS, which has PM capability and
has to be executed from the group where the database exists. Migration is a one-time activity,
and it requires exclusive access to the database. Since the internal structures are being changed,
a full backup of the database must be taken before starting the migration. Alternatively, if
sufficient resources are available one could make a copy of the database, do the migration on the
copy, verify the integrity and copy the migrated database back to the original. No data integrity
checking of the database is performed during this process. During migration, the RL'CONDI-
TION word in root file label #0 will be set to 'LS'. If for any reason the migration can't be com-
pleted, appropriate error messages will be displayed, and the user must revert back to the old
database environment from the previous backup.
The syntax for running migration utility is
RUN DBBIGSET.PUB.SYS;PARM=mig-option;INFO='dbname'
Where mig-option =1: migrate from entryname format to entrynumber format
-1: migrate from entrynumber format to entryname format
dbname = unqualified database name (without group or account)
NOTE It should be kept in mind that, migration involves changes to internal
structures of the database, and a backup must be taken before starting the
migration.
13
1: At least one master dataset in the database has a B-Tree
0: No datasets in the database have B-trees
12
1: Database has at least one expandable master dataset
0: Database contains no expandable master datasets
11
Unused
10
1: Database is in entrynumber format (i.e support for large size dataset available)
0: Database in entryname format (Dataset size can only be upto 80 GB)
09
1: Database uses new limits (# of sets = 240,
# of items = 1200, # paths per masters = 64)
0: Database uses old limits (# of sets = 199, #of items = 1024, # paths per master =
16)
08-01
Unused
Bit # Value/ Description