java.security.SecureRandom is a standard API provided by sun. Among various methods offered by this class void nextBytes(byte[]) is one. This method is used for generating random bytes. Oracle 11g JDBC drivers use this API to generate random number during login.

You might see errors similar to the following:

java.sql.SQLRecoverableException: IO Error: Connection reset
        at oracle.jdbc.driver.T4CPreparedStatement.executeForRows(T4CPreparedStatement.java:1028)
        at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1307)
        at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3449)
        at oracle.jdbc.driver.OraclePreparedStatement.execute(OraclePreparedStatement.java:3550)
        at oracle.jdbc.driver.OraclePreparedStatementWrapper.execute(OraclePreparedStatementWrapper.java:1374)
        at sun.reflect.GeneratedMethodAccessor55.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at oracle.ucp.jdbc.proxy.StatementProxyFactory.invoke(StatementProxyFactory.java:230)
        at oracle.ucp.jdbc.proxy.PreparedStatementProxyFactory.invoke(PreparedStatementProxyFactory.java:124)
        at $Proxy86.execute(Unknown Source)

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Many times you might want to know the exact elapse time of your SQL scripts. You can use the following technique to obtain the information.

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If you are experience Oracle SQL Developer locking up all the time randomly, you can try the following solutions. This applies to version 1.5.1 or 2.1 and above.

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It is simple to run sql script outside of sqlplus in *nix environment. You can simple add “@scriptname.sql” at the end of the sqlplus command. However, if you need to run a sql script outside of sqlplus in Windows, you need a little trick to do it “without” the need to manually enter “exit”

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If you have ampersand (&) in your SQL statement, Oracle SQL Developer will prompt you to enter value because it is being treated as substitution value. Follow the tip below to escape it and treat ampersand as a string value.

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