executeBatch JDBC的堆大小错误

Question

I'm using addBatch / executeBatch to insert some records in Oracle database table, but I've encountered the following heapsize error

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
    at java.lang.reflect.Array.newArray(Native Method)
    at java.lang.reflect.Array.newInstance(Array.java:52)
    at oracle.jdbc.driver.BufferCache.get(BufferCache.java:212)
    at oracle.jdbc.driver.PhysicalConnection.getCharBuffer(PhysicalConnection.java:7422)
    at oracle.jdbc.driver.OraclePreparedStatement.setupBindBuffers(OraclePreparedStatement.java:2826)
    at oracle.jdbc.driver.OraclePreparedStatement.executeBatch(OraclePreparedStatement.java:9973)
    at oracle.jdbc.driver.OracleStatementWrapper.executeBatch(OracleStatementWrapper.java:213)

I've added the following parameter

-Xms1024m -Xmx1024m

while calling the program with no luck. Adding the 1024m was fine for 180k records but it keeps crashing at 290k. I tried to increase it to 4024m but it does not help.

Answer 1

For every setting of the memory parameter you will find a record number that will fail.

Divide the rows in blocks of a manageable size and issue after adding of each block

 sendBatch()

In Oracle you may also set

setExecuteBatch(blockSize)  

where blockSize is the number of rows that will be passed in each roundtrip.