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참고: https://www.oracle.com/database/technologies/faq-jdbc.html
Oracle JDBC Frequently Asked Questions
For byte data, there are three Oracle SQL types: VARCHAR2, LONG and CLOB. VARCHAR2 data is of limited length, is stored directly in a column, and is transmitted to the server in inline packets. LONG data has a much larger limit (2 Gigibytes), is stored via
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