Use blobspace TEXT and BYTE data types and logical-log files

You must keep in mind the following two points when you use TEXT and BYTE data types in a database that uses transaction logging:

To ensure timely reuse of blobpages, back up logical-log files. When users delete TEXT or BYTE values in blobspaces, the blobpages do not become freed for reuse until you free the log file that contains the delete records. To free the log file, you must back it up.
When you must back up an unavailable blobspace, ontape skips it and makes it impossible to recover the TEXT or BYTE values when it becomes necessary. (However, blobpages from deleted TEXT or BYTE values do become free when the blobspace becomes available even though the TEXT or BYTE values were not backed up.)

In addition, regardless of whether the database uses transaction logging, when you create a blobspace or add a chunk to a blobspace, the blobspace or new chunk is not available for use until the logical-log file that records the event is not the current logical-log file. For information about switching logical-log files, see your Informix® Administrator's Guide.