I want to have an automatic timed transfer from Oracle database to MongoDB. In a typical RDBMBS scenario, i would have established connection between two databases by creating a dblink and transferred the data by using PL/SQL procedures. But i don't know what to do in MongoDB case; thus, how and what should i be implementing so that i can have an automatic transfer from Oracle database to MongoDB.
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I would look at using Oracle Goldengate. It has a MONGODB Handler. https://docs.oracle.com/goldengate/bd123110/gg-bd/GADBD/using-mongodb-handler.htm#GADBD-GUID-084CCCD6-8D13-43C0-A6C4-4D2AC8B8FA86
https://oracledb101.wordpress.com/2016/07/29/using-goldengate-to-replicate-to-mongodb/
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What type of data do you want to transfer from the Oracle database to MongoDB? If you just want to export/import a small number of tables on a set schedule, you could use something like UTL_FILE on the Oracle side to create a .csv export of the table(s) and use DBMS_SCHEDULER to schedule the export to happen automatically based on your desired time frame.
You could also use an application like SQL Developer to export tables as .csv files by browsing to the table the schema list, then Right Click -> Export and choosing the .csv format. You may also find it a little easier to use UTL_FILE and DBMS_SCHEDULER through SQL Developer instead of relying on SQL*Plus.
Once you have your .csv file(s), you can use mongoimport to import the data, though I'm not sure if MongoDB supports scheduled jobs like Oracle (I work primarily with the latter.) If you are using Linux, you could use cron to schedule a script that will import the .csv file on a scheduled interval.
