I executed my application which uses a Fb database. Trace log was enabled. 
There was a strange internal transaction
 

 2015-04-14T10:46:44.6010 (3684:00D0A9F4) START_TRANSACTION
 

 C:\. . .\MYDATABASE.FDB (ATT_0, <unknown_user>, NONE, <internal>)
 

 
 (TRA_595, READ_COMMITTED | REC_VERSION | WAIT | READ_ONLY)
 

 It stayed active over 6 minutes until I stopped my application.
 

 2015-04-14T10:52:55.0410 (3684:00D0A9F4) COMMIT_TRANSACTION
 

 C:\. . .\MYDATABASE.FDB (ATT_0, <unknown_user>, NONE, <internal>)
 

 (TRA_595, READ_COMMITTED | REC_VERSION | WAIT | READ_ONLY)
 

 
       0 ms
 

 There is no other information about TRA_595 in the whole log file. What is 
that transaction?
 

 Thanks for the information!
 

 Hannu
 

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