Managing an oracle instance

Let check these link for Managing an oracle Instances 
http://ampersandacademy.com/tutorials/managing-oracle-instance-oracle11g/

           

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Error in starting the service (OracleMTSRecovery)

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ORA-39000, ORA-39143 ORA- 31619 invalid dump file in datapump

Today i am tired to export  one schema (hr) from the one database  into another database  ( import schema ) so i created one directory which is called "ram" grant read and write access to  the system user ,then i started export the schema (hr) from production  while i did the export of hr schema the job was successful after that i did import schema like below expdp : C:\>expdp system/oracle directory=ram schemas=hr dumpfile=hr.dmp logfile=hr.log ...... ...... Dump file set for SYSTEM.SYS_EXPORT_SCHEMA_02 is:   C:\datapump\HR.DMP Job "SYSTEM"."SYS_EXPORT_SCHEMA_02" successfully completed at 13:23:40 impdp: C:\>impdp system/oracle directory=ram remap_schema=hr:scott dumpfile=HR.DMP logfile=hr.log it through an error like below . ORA-39001: invalid argument value ORA-39000: bad dump file specification ORA-31619: invalid dump file "C:\datapump\hr.dmp" ORA-27091: unable to queue I/O ORA-27070: async read/write failed OSD-04006: ReadFile() failu...
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ORA-00439: feature not enabled: Flashback Database

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