Relational and non-relational databases
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import uuid import time import sqlite3 import MySQLdb import MySQLdb.cursors import psycopg2 NR_OF_ROWS = 1000000 # connect to the database and set transaction level to autocommit s_con = sqlite3.connect(database='/tmp/student.db', isolation_level=None) # None, 'DEFERRED', 'IMMEDIATE', 'EXCLUSIVE' m_con = MySQLdb.connect(host='localhost', user='student', passwd='student', db='student', cursorclass = MySQLdb.cursors.SSCursor) m_con.autocommit(True) # True, False p_con = psycopg2.connect('host=localhost user=student password=student dbname=student') p_con.set_isolation_level(0) # 0 (AUTOCOMMIT), 1 (READ COMMIT), 3 (SERIALIZE) # get cursor s_cur = s_con.cursor() m_cur = m_con.cursor() p_cur = p_con.cursor() # drop old tables if they exist, ignore otherwise try: s_cur.execute("DROP TABLE large_table") except: pass try: m_cur.execute("DROP TABLE large_table") except: pass try: p_cur.execute("DROP TABLE large_table") except: pass # create table s_cur.execute("CREATE TABLE large_table (id VARCHAR(255) PRIMARY KEY)") m_cur.execute("CREATE TABLE large_table (id VARCHAR(255) PRIMARY KEY) Engine=InnoDB") p_cur.execute("CREATE TABLE large_table (id VARCHAR(255) PRIMARY KEY)") # insert lots of rows and measure print 'sqlite:', time_start = time.time() for i in xrange(NR_OF_ROWS): pass # YOUR CODE HERE, USE str(uuid.uuid4()) print time.time()-time_start print 'mysql:', time_start = time.time() for i in xrange(NR_OF_ROWS): pass # YOUR CODE HERE, USE str(uuid.uuid4()) print time.time()-time_start print 'postgresql:', time_start = time.time() for i in xrange(NR_OF_ROWS): pass # YOUR CODE HERE, USE str(uuid.uuid4()) print time.time()-time_start # drop table s_cur.execute("DROP TABLE large_table") m_cur.execute("DROP TABLE large_table") p_cur.execute("DROP TABLE large_table") # close everything s_cur.close() m_cur.close() p_cur.close() s_con.close() m_con.close() p_con.close()
import sqlite3 import MySQLdb import MySQLdb.cursors import psycopg2 # connect to the database and set transaction level to autocommit s_con = sqlite3.connect(database='/tmp/student.db', isolation_level=None) # None, 'DEFERRED', 'IMMEDIATE', 'EXCLUSIVE' m_con = MySQLdb.connect(host='localhost', user='student', passwd='student', db='student', cursorclass = MySQLdb.cursors.SSCursor) m_con.autocommit(True) # True, False p_con = psycopg2.connect('host=localhost user=student password=student dbname=student') p_con.set_isolation_level(0) # 0 (AUTOCOMMIT), 1 (READ COMMIT), 3 (SERIALIZE) # get cursor s_cur = s_con.cursor() m_cur = m_con.cursor() p_cur = p_con.cursor() # drop old tables if they exist, ignore otherwise try: s_cur.execute("DROP TABLE test_table") except: pass try: m_cur.execute("DROP TABLE test_table") except: pass try: p_cur.execute("DROP TABLE test_table") except: pass # create table s_cur.execute("CREATE TABLE test_table (id INTEGER PRIMARY KEY, value VARCHAR(255))") m_cur.execute("CREATE TABLE test_table (id INTEGER PRIMARY KEY, value VARCHAR(255)) Engine=InnoDB") p_cur.execute("CREATE TABLE test_table (id INTEGER PRIMARY KEY, value VARCHAR(255))") # insert data s_cur.execute("INSERT INTO test_table(id, value) VALUES (0, 'my first value')") s_cur.execute("INSERT INTO test_table(id, value) VALUES (0, 'my second value')") s_cur.execute("INSERT INTO test_table(id, value) VALUES (0, 'my second value')") m_cur.execute("INSERT INTO test_table(id, value) VALUES (0, 'my first value')") m_cur.execute("INSERT INTO test_table(id, value) VALUES (0, 'my second value')") m_cur.execute("INSERT INTO test_table(id, value) VALUES (0, 'my second value')") p_cur.execute("INSERT INTO test_table(id, value) VALUES (0, 'my first value')") p_cur.execute("INSERT INTO test_table(id, value) VALUES (0, 'my second value')") p_cur.execute("INSERT INTO test_table(id, value) VALUES (0, 'my second value')") # selecting data (everything) print 'sqlite' s_cur.execute("SELECT id, value FROM test_table") print s_cur.fetchall() print 'mysql' m_cur.execute("SELECT id, value FROM test_table") print m_cur.fetchall() print 'postgresql' p_cur.execute("SELECT id, value FROM test_table") print p_cur.fetchall() # selecting data (iteratively) print 'sqlite' s_cur.execute("SELECT id, value FROM test_table") for row in s_cur: print row print 'mysql' m_cur.execute("SELECT id, value FROM test_table") for row in m_cur: print row print 'postgresql' p_cur.execute("SELECT id, value FROM test_table") for row in p_cur: print row # close everything s_cur.close() m_cur.close() p_cur.close() s_con.close() m_con.close() p_con.close()
import sqlite3 import MySQLdb import psycopg2 s_con = sqlite3.connect(database='/home/username/student.db') m_con = MySQLdb.connect(host='localhost', user='student', passwd='student', db='student') p_con = psycopg2.connect('host=localhost user=student password=student dbname=student') s_con.close() m_con.close() p_con.close()
CREATE TABLE test_table (id integer, name varchar(255));
Hosts:
ssh <username>@<host>.scc.kit.edu -p24
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