View source for 1. Backup error unsuccessful metadata update and database is already in the physical backup mode

<big>'''Symptoms :'''</big>
: 1. The following error message prompted during the backup process.
 unsuccessful metadata update
 ALTER DATABASE failed
 Database is already in the physical backup mode.

: 2. Found the filename '''ACC-XXXXX.FDB.delta''' in DB folder. '''DO NOT''' remove this file. 
::[[File:07-FAQ-01.jpg |500px]]
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<big>'''Solution:'''</big> 
:1. Run '''CMD'''.
:2. Type the following command and hit '''<ENTER>'''.
::Firebird folder under root '''c:\Program Files'''
  cd c:\Program Files\Firebird\Firebird_3_0 

::Firebird folder under root '''c:\'''
  cd c:\Firebird\Firebird_3_0 

::[[File:07-FAQ-02.jpg|500px]]
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:3. Under the root c:\...Firebird\Firebird_3_0, type the following command and hit '''<ENTER>'''.
  set isc_user=sysdba

:4. Under the root c:\...Firebird\Firebird_3_0, type the following command and hit '''<ENTER>'''.
  set isc_password=masterkey

:5. Under the root c:\...Firebird\Firebird_3_0, type the following command and hit '''<ENTER>'''.
  nbackup -unlock '''C:\eStream\SQLAccounting\DB\ACC-XXXXX.FDB'''

:6. You will found the '''ACC-XXXXX.FDB.delta''' file will be removed automatically. 
:7. Login the database and run backup at File | Backup Database as normal.