I have the choice of manipulating database data using a byte or a java.sql.Blob. Which has best performance?
java.sql.Blob, since it does not extract any data from the database until you explicitly ask it to. The Java platform 2 type
Blob wraps a database locator (which is essentially a pointer to byte). That pointer is a rather large number (between 32 and 256 bits in size) - but the effort to extract it from the database is insignificant next to extracting the full blob content. For insertion
into the database, you should use a byte since data has not been uploaded to the database yet. Thus, use the Blob class only for extraction.
Conclusion: use the java.sql.Blob class for extraction whenever you can.