$ wget https://pypi.python.org/packages/65/65/89afee016aca7fbb5c1642e6ef3864d80af808dc5efa7367b328093eece9/DBUtils-1.1.tar.gztar -zxf DBUtils-1.1.tar.gzcd DBUtils-1.1
python setup.py install

#不用连接池的MySQL连接方法
import MySQLdb
conn= MySQLdb.connect(host='localhost',user='root',passwd='pwd',db='myDB',port=3306)
cur=conn.cursor()
SQL="select * from table1"
r=cur.execute(SQL)
r=cur.fetchall()
cur.close()
conn.close()

#用连接池后的连接方法
import MySQLdb
from DBUtils.PooledDB import PooledDB
pool = PooledDB(MySQLdb,5,host='localhost',user='root',passwd='pwd',db='myDB',port=3306) #5为连接池里的最少连接数

conn = pool.connection()  #以后每次需要数据库连接就是用connection（）函数获取连接就好了
cur=conn.cursor()
SQL="select * from table1"
r=cur.execute(SQL)
r=cur.fetchall()
cur.close()
conn.close()

    # get mysql PooledDBlogger.info("get MySQL connect.")host = get_config('monitor_server','host')port = get_config('monitor_server','port')user = get_config('monitor_server','user')passwd = get_config('monitor_server','passwd')dbname = get_config('monitor_server','dbname')try:# mincached 最少的空闲连接数，如果空闲连接数小于这个数，pool会创建一个新的连接mysql_pool = PooledDB(MySQLdb,mincached=20,blocking=True,host=host,user=user,passwd=passwd,port=int(port),db=dbname,connect_timeout=5,charset='utf8')glob.set_value('mysql_conn',mysql_pool)except Exception,e:print "start mysql(pooledDB) error:" + str(e)

    #get oracle servers listlogger.info("get Oracle connect.")servers=func.mysql_query("select id,host,port,dsn,username,password,tags from db_servers_oracle where is_delete=0 and monitor=1;")if servers:for row in servers:server_id=row[0]host=row[1]port=row[2]dsn=row[3]username=row[4]password=row[5]tags=row[6]ora_dsn = host + ":" + port + "/" + dsntry:oracle_pool = PooledDB(cx_Oracle,mincached=20,blocking=True,user=username,password=password,dsn=ora_dsn)conn_name = "server_"+str(server_id)+"_pool"glob.set_value(conn_name,oracle_pool)except Exception, e:logger_msg="check oracle server connect %s : %s" %(ora_dsn,str(e).strip('\n'))logger.warning(logger_msg)

连接池 + 单index线程循环 + 服务器循环外join + 执行oracle操作 -> 异常退出单连接 + 单index线程循环 + 服务器循环外join + 执行oracle操作 -> 异常退出单连接 + 单index线程循环 + 服务器循环外join + 不执行oracle操作 -> 正常连接池 + 单index线程循环 + 服务器循环外join + 不执行oracle操作 -> 正常连接池 + 单index线程循环 + 服务器循环外join + 执行单条oracle操作 -> 异常

#路径：/usr/lib/oracle/12.2/client64/network/admin/sqlnet.ora
DIAG_ADR_ENABLED=OFF
DIAG_SIGHANDLER_ENABLED=FALSE
DIAG_DDE_ENABLED=FALSE