31 lines
1.0 KiB
Python
31 lines
1.0 KiB
Python
#------------------------------------------------------------------------------
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# Copyright (c) 2016, 2021, Oracle and/or its affiliates. All rights reserved.
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#------------------------------------------------------------------------------
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#------------------------------------------------------------------------------
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# query_arraysize.py
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#
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# Demonstrate how to alter the array size and prefetch rows value on a cursor
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# in order to reduce the number of network round trips and overhead required to
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# fetch all of the rows from a large table.
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#------------------------------------------------------------------------------
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import time
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import cx_Oracle as oracledb
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import sample_env
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connection = oracledb.connect(sample_env.get_main_connect_string())
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start = time.time()
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cursor = connection.cursor()
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cursor.prefetchrows = 1000
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cursor.arraysize = 1000
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cursor.execute('select * from bigtab')
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res = cursor.fetchall()
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# print(res) # uncomment to display the query results
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elapsed = (time.time() - start)
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print("Retrieved", len(res), "rows in", elapsed, "seconds")
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