DATABLOCKSIZE - Teradata Vantage

Teradata® VantageCloud Lake
Deployment
VantageCloud
Edition
Lake
Product
Teradata Vantage
Published
January 2023
ft:locale
en-US
ft:lastEdition
2024-12-11
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phg1621910019905

Maximum data block size for blocks that contain multiple rows as the value data_block_size. The calculation is the same as for the CREATE TABLE statement. For additional information, see DATABLOCKSIZE. For information about setting database-wide or user-wide default data block sizes, see CREATE DATABASE or CREATE USER.

For Object File System tables, DATABLOCKSIZE has a default setting that you cannot change.

Data blocks for both permanent data and spool files default to sizes set in internal control object. All parameters related to data block size cannot be updated by VantageCloud Lake customers.
data_block_size
Decimal number or integer using exponential notation. For example, you can write one thousand as either 1000 or 1E3.
BYTES
KBYTES
KILOBYTES
BYTES can be abbreviated as BYTE. The default is BYTES. 

KILOBYTES can be abbreviated as KBYTE or KBYTES. For the rounding rules, see CREATE TABLE and CREATE TABLE AS.
IMMEDIATE
Repackage data blocks into the newly specified size immediately instead of waiting until an affected block is modified or allocated. The new data_block_size value determines the maximum size of multiple-row data blocks subsequently modified or allocated.
  • If you specify IMMEDIATE, the attribute value is changed and the rows in all existing data blocks are repacked into data blocks of the specified size.
  • If you do not specify IMMEDIATE, the existing data blocks are not modified.
You cannot specify IMMEDIATE if you specify the BLOCKCOMPRESSION option.
MINIMUM
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.
MAXIMUM
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.
DEFAULT
The default data block size for this table.