Why Spring's jdbcTemplate.batchUpdate() so slow?

Question

I\'m trying to find the faster way to do batch insert.

I tried to insert several batches with jdbcTemplate.update(String sql), wher

Answer 1

I found a major improvement setting the argTypes array in the call.

In my case, with Spring 4.1.4 and Oracle 12c, for insertion of 5000 rows with 35 fields:

jdbcTemplate.batchUpdate(insert, parameters); // Take 7 seconds

jdbcTemplate.batchUpdate(insert, parameters, argTypes); // Take 0.08 seconds!!!

The argTypes param is an int array where you set each field in this way:

int[] argTypes = new int[35];
argTypes[0] = Types.VARCHAR;
argTypes[1] = Types.VARCHAR;
argTypes[2] = Types.VARCHAR;
argTypes[3] = Types.DECIMAL;
argTypes[4] = Types.TIMESTAMP;
.....

I debugged org\springframework\jdbc\core\JdbcTemplate.java and found that most of the time was consumed trying to know the nature of each field, and this was made for each record.

Hope this helps !