Temporary smart large objects
Use temporary smart large objects to store text or image data (CLOB or BLOB) that do not require restoring from a backup or log replay in fast recovery.
Temporary smart large objects last for the user session and are much faster to update than smart large objects.
You create a temporary smart large object in the same way as a
permanent smart large object, except you set the LO_CREATE_TEMP flag
in the ifx_lo_specset_flags or mi_lo_specset_flags function.
Use mi_lo_copy or ifx_lo_copy to
create a permanent smart large object from a temporary smart large
object. For details on creating temporary smart large objects, see
the HCL OneDB™
DataBlade® API Programmer's
Guide.
Important: Store pointers to temporary large objects in temporary
tables only. If you store them in standard tables and reboot the database
server, it results in an error that says that the large object does
not exist.
The following table compares standard and temporary smart large
objects.
| Characteristics | Smart large object | Temporary smart large object |
|---|---|---|
| Creation flags | LO_CREATE_LOG or LO_CREATE_NOLOG | LO_CREATE_TEMP |
| Rollback | Yes | No |
| Logging | Yes, if turned on | No |
| Duration | Permanent (until user deletes it) | Deleted at end of user session or transaction |
| Table type stored in | Permanent or temporary table | Temporary tables |