| Firebird 2.5 Language Reference → Firebird 2.5 Language Reference → System Tables → RDB$FORMATS |
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RDB$FORMATS stores information about changes in tables. Each time any metadata change to a table is committed, it gets a new format number. When the format number of any table reaches 255, the entire database becomes inoperable. To return to normal, the database must be backed up with the gbak utility and restored from that backup copy.
| Column Name | Data Type | Description |
|---|---|---|
| RDB$RELATION_ID | SMALLINT | Table or view identifier |
| RDB$FORMAT | SMALLINT | Table format identifier—maximum 255. The critical time comes when this number approaches 255 for any table or view |
| RDB$DESCRIPTOR | BLOB FORMAT | Stores column names and data attributes as BLOB, as they were at the time the format record was created |
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| Firebird 2.5 Language Reference → Firebird 2.5 Language Reference → System Tables → RDB$FORMATS |