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Now, I'd found the solution!
With

db.TransactIsolationLevel:= tiReadCommitted ;

in DB's initialization FireBird client works fine without any reconnections (thank Mark for suggestions)!

Thank, Mark! I have two similar DBs,- in ORACLE and Firebird,- identical tables, fields. The tables "CurData" are filled (once per second) by "first" program,- another soft on another connections to both DBs. The result of filling (changed values) I can observe by IBExpert for Fi...

Thank, "guidoaerts" ! I'll do that.
But what is the reason for this difference between FireBird and ORACLE?

Why I can't read the updated values from FireBird database? With the same in ORACLE is none problems. Next test read data from "CurData" (which are constantly updated) only first time. All is OK with uncommited "db.Reconnect" but this consump twice more time in cycle :( Thanks. [...

I found another problem,- it did not recognized codepage win1251 when use Firebird-2 and ZEOSDBO 6.6 for access to embedded database. I could not to connect to embedded firebird from both ZEOSDBO 6.6/6/5 :cry: But thanks for your job,- ZEOS is a great project and I'll be looking for new stable versi...

I've the same problem. How to connect to embedded FireBird