15.10 - DATABLOCKSIZE - Teradata Database

Teradata Database SQL Data Definition Language Syntax and Examples

Teradata Database
December 2015
Programming Reference

Maximum data block size for blocks that contain multiple rows as the value numeric.

If DATABLOCKSIZE is not specified, then data blocks default to the sizes set in the PermDBSize and JournalDBSize fields of the DBS Control Record.

  • The default value for a PERM data block is specified using the PermDBSize parameter of the DBS Control record.
  • The default value for transient and permanent journal data blocks is specified using the JournalDBSize parameter of the DBS Control Record.
Value for data block size.
BYTES can be abbreviated as BYTE.
KILOBYTES can be abbreviated as KBYTE.
The smallest data block size for this table.
MINIMUM DATABLOCKSIZE sets the maximum data block size for blocks that contain multiple rows to the minimum value of 21,504 bytes (42 sectors) for systems with large cylinders or 9,216 bytes (18 sectors) for systems without large cylinders.
You can abbreviate MINIMUM as MIN.
For details about minimum data block sizes, see “DATABLOCKSIZE” in the “CREATE TABLE” section of SQL Data Definition Language - Detailed Topics, B035-1184.
The largest data block size for this table.
Systems that do not support block sizes 128KB and larger use a value of 127.5KB.
Systems that allow blocks larger than 127.5KB use a maximum of 1,048,064 bytes (2047 sectors) for large cylinders or 262,144 bytes (512 sectors) for small cylinders.
The value can be expressed either as a decimal number or integer number or using exponential notation. For example, you can write one thousand as either 1000 or 1E3.
You can abbreviate MAXIMUM as MAX.
The default data block size for this table.
If you specify DEFAULT or do not specify a value, Teradata Database uses the system-wide default data block size specified by the DBS Control setting PermDBSize. For details, see Utilities, B035-1102.