There are two formats of parcel headers. Definitions for the parcel headers are located on a release tape as shown below:
| For this language . . . | Definitions are located in the. . . |
|---|---|
| IBM Assembler | TDPXPH in library SAMPLIB (z/OS) |
The first format is:
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| Field Name | Offset | Length | Description |
|---|---|---|---|
| PH0FLAVR | 00 | 1 bit | A binary zero, indicating this header format. The mnemonic for the bit is PH0FALT |
| PH0FLAVR | 0.1 | 15 bits | An unsigned integer identifying the type of parcel body. |
| PH0LEN | 02 | 2 bytes | An unsigned integer specifying the length of the parcel, in bytes, including the parcel header and any body. |
The second format is:
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| Field Name | Offset | Length | Description |
|---|---|---|---|
| PH1FLAVR | 00 | 1 bit | A binary zero, indicating this header format. The mnemonic for the bit is PH1FALT |
| PH1FLAVR | 0.1 | 15 bits | An unsigned integer identifying the type of parcel body. |
| PH1FILL1 | 02 | 2 bytes | Not used: Set to binary zeroes. |
| PH1LEN | 04 | 4 bytes | An unsigned integer specifying the length of the parcel, in bytes, including the parcel header and any body. |
A response will only contain a parcel with the enlarged header if the APH-response-permitted option was specified and the Teradata Database supports the alternate header for that parcel. Furthermore, parcels whose length is less than or equal to 65535 can use either header format.