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1. use database as archive log mode and set archive dest location
alter system set LOG_ARCHIVE_DEST_1 = 'LOCATION=/u04/arch/orcl' scope=spfile;
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ALTER SYSTEM SET DB_FLASHBACK_RETENTION_TARGET=43200; --30 days
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This article shows how Oracle's Heterogeneous Services can be configured to allow a database to connect to a Microsoft Access database using standard databases links. The method described can be used to connect to MS-Access from about any platform - Unix/ Linux or Windows.
MS-Access 2003 and Orac ......