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#------------------------------------------------------------------------------
# Copyright (c) 2016, 2020, Oracle and/or its affiliates. All rights reserved.
#------------------------------------------------------------------------------
#------------------------------------------------------------------------------
# QueryArraysize.py
# Demonstrate how to alter the array size and prefetch rows value on a cursor
# in order to reduce the number of network round trips and overhead required to
# fetch all of the rows from a large table.
#------------------------------------------------------------------------------
import time
import cx_Oracle
import sample_env
connection = cx_Oracle.connect(sample_env.get_main_connect_string())
start = time.time()
cursor = connection.cursor()
cursor.prefetchrows = 1000
cursor.arraysize = 1000
cursor.execute('select * from bigtab')
res = cursor.fetchall()
# print(res)  # uncomment to display the query results
elapsed = (time.time() - start)
print("Retrieved", len(res), "rows in", elapsed, "seconds")

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