Maximum sizes of HD databases

The maximum possible size of HDAM, PHDAM, HIDAM, and PHIDAM databases is based on the number of data sets the database can hold and the size of the data sets. The maximum possible size of a data set differs depending on whether VSAM or OSAM is used and whether the database is partitioned.

The following table lists the maximum data set size, maximum number of data sets, and maximum database size for HDAM, PHDAM, HIDAM, and PHIDAM databases.

Table 1. Maximum sizes for HDAM, HIDAM, PHDAM, and PHIDAM databases
Data set type Maximum data set size Maximum number of data sets Maximum database size
OSAM HDAM or HIDAM Database 8 GB 10 data sets 80 GB
VSAM HDAM or HIDAM Database 4 GB 10 data sets 40 GB
OSAM PHDAM or PHIDAM Database 4 or 8 GB1 10 010 data sets (10 data sets per partition; 1001 partitions per database) 40 040 or 80 080 GB
VSAM PHDAM or PHIDAM Database 4 GB 10 010 data sets (10 data sets per partition; 1001 partitions per database) 40 040 GB
Note:
  1. The maximum size depends on how the HALDB is registered with DBRC. By default, the maximum size of the OSAM data sets is 4 GB.