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Oracle 11g not allowing to connect to. Error ORA-01122: database file 1 failed verification check

I am running Oracle 11g on Windows 7 Enterprise SP2 16 GB RAM, 1 TB HD. I can connect to Oracle using SQL Plus (see below), C:>sqlplus sys/xxxxxxxxx@XE as sysdba SQL*Plus: Release 11.2.0.1.0 ...
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1answer
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ORA-12541 error while connecting to oracle express edition 11g

My oracle express edition was working some months earlier. I dont know what i changed in the system, now I could not connect to it. I tried logging in from sqlplus as sysdba and altered the accounts ...
7
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2answers
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SQL Server Express vs. Oracle Express Edition vs DB2 Express-C [closed]

I have been trying to compare the features of the SQL Server Express, Oracle XE and DB2 Express-C, but find it difficult to compile all the differences into one place. Especially the current ...