Binary Types

Table 1 lists the binary data types supported by GaussDB.

**Table 1** Binary data types
Name	Description	Storage Space
BLOB	Binary large object (BLOB). Currently, BLOB only supports the following external access APIs: DBE_LOB.GET_LENGTH DBE_LOB.READ DBE_LOB.WRITE DBE_LOB.WRITE_APPEND DBE_LOB.COPY DBE_LOB.ERASE For details about the APIs, see DBE_LOB.	The maximum size is 32 TB (35,184,372,088,832 bytes).
RAW	Variable-length hexadecimal string.	4 bytes plus the actual hexadecimal string. Its maximum length is 1073733621 bytes (1 GB – 8203 bytes).
BYTEA	Variable-length binary string.	4 bytes plus the actual binary string. Its maximum length is 1073733621 bytes (1 GB – 8203 bytes).

In addition to the size limitation on each column, the total size of each tuple cannot exceed 1,073,733,621 bytes (that is, 1 GB minus 8,203 bytes).

Example:

   
        -- Create a table.
openGauss=#  CREATE TABLE blob_type_t1 
(
    BT_COL1 INTEGER,
    BT_COL2 BLOB,
    BT_COL3 RAW,
    BT_COL4 BYTEA
) ;

-- Insert data.
openGauss=#  INSERT INTO blob_type_t1 VALUES(10,empty_blob(),
HEXTORAW('DEADBEEF'),E'\\xDEADBEEF');

-- Query data in the table.
openGauss=#  SELECT * FROM blob_type_t1;
 bt_col1 | bt_col2 | bt_col3  |  bt_col4   
---------+---------+----------+------------
      10 |         | DEADBEEF | \xdeadbeef
(1 row)

-- Delete the table.
openGauss=#  DROP TABLE blob_type_t1;