15.00 - Disk Space for Reconfiguration - Teradata Database

Teradata Database Support Utilities

prodname
Teradata Database
vrm_release
15.00
category
Configuration
featnum
B035-1180-015K

Disk Space for Reconfiguration

When changing cluster assignments or hash bucket sizes, ample disk space must be available on all AMPs. If sufficient space is not available, Teradata Database stops. To recover, reinitialize Teradata Database using the sysinit utility. Note that reinitializing the system destroys all data, which would need to be restored from an archive backup.

Teradata recommends the following availability:

  • Before starting reconfiguration that involves a change of clusters, currentperm space should be less than 53% of the total maxperm space (that is, at least 47% of system maxperm must be available).
  • Before starting a reconfiguration that involves a change of hash bucket size, currentperm space should be less than 25% of the total maxperm space (that is, at least 75% of system maxperm must be available).
  • For online reconfiguration, additional disk space is needed for the Reconfiguration Journal. The space used for this is determined by the RECONFIG command JOURNAL MAXPERMSPACE setting. For more information, see “RECONFIG” on page 258.