Level 1+ backup to S3 can be unreliable for some buckets

Detail name	Value
Changelog Number	9064
Type	Bug
Status	Resolved
Affected Versions	Exasol 6.1.0, Exasol 6.2.0
Fix Versions	Exasol 6.1.x, Exasol 7.0.0, Exasol 6.2.3
Resolution Date	2019-12-12

Problem

For level 1 and higher backups, the backup process in some cases fails to find a base backup file when backing up to AWS S3. This can happen if the bucket contains many objects or if the S3 API returns an error for unspecified reasons.

Workarounds

Either of these is likely to make level 1 backups more reliable:

• Using a bucket with fewer objects, ideally only for the database backups.
• Slightly moving the backup schedule.

Alternatively, level 0 backups still work even in the presence of this issue because they don't need to find a base backup in the bucket.