[20190314]理解TRANSPORT_CONNECT_TIMEOUT RETRY_COUNT参数在tnsnames.ora.tx

[20190314]理解LOAD_BALANCE TRANSPORT_CONNECT_TIMEOUT RETRY_COUNT参数在tnsnames.ora.txt --//链接:https://dba010.com/2019/03/11/understanding-load_balance-parameter-in-tnsnames-ora/ --//以前也做过类似测试:http://blog.itpub.net/267265/viewspace-2199977/ TRANSPORT_CONNECT_TIMEOUT: "The TRANSPORT_CONNECT_TIMEOUT parameter specifies the time, in seconds, for a client to establish a TCP connection to the database server. The default value is 60 seconds." For more information, click here RETRY_COUNT: "To specify the number of times an ADDRESS list is traversed before the connection attempt is terminated." For more information, click here          --//实际上测试次数是RETRY_COUNT+1. --//重复测试: 1.在/tmp目录下建立tnsnames.ora,内容如下: $ export TNS_ADMIN=/tmp $ cat tnsnames.ora CLIENT_CON =  (DESCRIPTION =   (LOAD_BALANCE=ON)    (TRANSPORT_CONNECT_TIMEOUT=3)(RETRY_COUNT=2)    (ADDRESS = (PROTOCOL = TCP)(HOST =10.10.10.10)(PORT = 1522))    (ADDRESS = (PROTOCOL = TCP)(HOST =11.11.11.11)(PORT = 1522))    (ADDRESS = (PROTOCOL = TCP)(HOST =12.12.12.12)(PORT = 1522))    (ADDRESS = (PROTOCOL = TCP)(HOST =13.13.13.13)(PORT = 1522))    (ADDRESS = (PROTOCOL = TCP)(HOST =14.14.14.14)(PORT = 1522))    (ADDRESS = (PROTOCOL = TCP)(HOST =15.15.15.15)(PORT = 1522))   (CONNECT_DATA =      (SERVER = DEDICATED)      (SERVICE_NAME = orclgg)    )) 2.测试: $ export TNS_ADMIN=/tmp $ strace -tT -f tnsping client_con 2>&1 | grep  'connect' $ strace -tT -f tnsping client_con 2>&1 | grep  'connect' 08:58:03 connect(4, {sa_family=AF_FILE, path="/var/run/nscd/socket"...}, 110) = -1 ENOENT (No such file or directory) <0.000033> 08:58:03 connect(4, {sa_family=AF_FILE, path="/var/run/nscd/socket"...}, 110) = -1 ENOENT (No such file or directory) <0.000033> 08:58:03 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("15.15.15.15")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000052> 08:58:06 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("12.12.12.12")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000042> 08:58:09 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("14.14.14.14")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000044> 08:58:12 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("11.11.11.11")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000041> 08:58:15 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("13.13.13.13")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000041> 08:58:18 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("10.10.10.10")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000042> 08:58:21 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("12.12.12.12")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000042> 08:58:24 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("10.10.10.10")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000041> 08:58:27 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("11.11.11.11")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000041> 08:58:30 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("14.14.14.14")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000043> 08:58:33 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("13.13.13.13")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000042> 08:58:36 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("15.15.15.15")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000041> 08:58:39 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("10.10.10.10")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000044> 08:58:42 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("12.12.12.12")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000043> 08:58:45 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("15.15.15.15")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000042> 08:58:48 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("11.11.11.11")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000040> 08:58:51 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("13.13.13.13")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000045> 08:58:54 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("14.14.14.14")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000041> --//分成3组,也就是尝试3次.每次选择的IP不是定义的顺序(LOAD_BALANCE=ON). --//如果连接不上,时间间隔是3秒尝试下一个. 3.修改tnsnames.ora文件(LOAD_BALANCE=OFF): --//重复测试: $ strace -tT -f tnsping client_con 2>&1 | grep -E 'connect' 09:01:46 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("10.10.10.10")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000050> 09:01:49 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("11.11.11.11")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000042> 09:01:52 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("12.12.12.12")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000042> 09:01:55 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("13.13.13.13")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000043> 09:01:58 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("14.14.14.14")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000044> 09:02:01 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("15.15.15.15")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000042> 09:02:04 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("10.10.10.10")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000042> 09:02:07 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("11.11.11.11")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000046> 09:02:10 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("12.12.12.12")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000036> 09:02:13 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("13.13.13.13")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000034> 09:02:16 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("14.14.14.14")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000036> 09:02:19 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("15.15.15.15")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000038> 09:02:22 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("10.10.10.10")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000037> 09:02:25 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("11.11.11.11")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000038> 09:02:28 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("12.12.12.12")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000037> 09:02:31 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("13.13.13.13")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000038> 09:02:34 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("14.14.14.14")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000037> 09:02:37 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("15.15.15.15")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000037> --//可以发现尝试顺便选择的IP是定义的顺序. 4.取消TRANSPORT_CONNECT_TIMEOUT设置: $ cat tnsnames.ora CLIENT_CON =  (DESCRIPTION =   (LOAD_BALANCE=OFF)    (RETRY_COUNT=1)    (ADDRESS = (PROTOCOL = TCP)(HOST =10.10.10.10)(PORT = 1522))    (ADDRESS = (PROTOCOL = TCP)(HOST =11.11.11.11)(PORT = 1522))    (ADDRESS = (PROTOCOL = TCP)(HOST =12.12.12.12)(PORT = 1522))    (ADDRESS = (PROTOCOL = TCP)(HOST =13.13.13.13)(PORT = 1522))    (ADDRESS = (PROTOCOL = TCP)(HOST =14.14.14.14)(PORT = 1522))    (ADDRESS = (PROTOCOL = TCP)(HOST =15.15.15.15)(PORT = 1522))   (CONNECT_DATA =      (SERVER = DEDICATED)      (SERVICE_NAME = orclgg)    )) $ strace -tT -f tnsping client_con 2>&1 | grep -E 'connect' 09:05:53 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("10.10.10.10")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000052> 09:06:53 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("11.11.11.11")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000045> 09:07:53 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("12.12.12.12")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000047> 09:08:53 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("13.13.13.13")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000057> 09:09:53 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("14.14.14.14")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000057> 09:10:53 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("15.15.15.15")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000067> 09:11:53 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("10.10.10.10")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000056> 09:12:53 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("11.11.11.11")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000051> 09:13:53 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("12.12.12.12")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000042> 09:14:54 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("13.13.13.13")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000043> 09:15:54 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("14.14.14.14")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000045> 09:16:54 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("15.15.15.15")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000043> --//可以发现间隔是60秒,也就是缺省TRANSPORT_CONNECT_TIMEOUT=60. 4.取消RETRY_COUNT设置: $ cat tnsnames.ora CLIENT_CON =  (DESCRIPTION =   (LOAD_BALANCE=OFF)    (TRANSPORT_CONNECT_TIMEOUT=1)    (ADDRESS = (PROTOCOL = TCP)(HOST =10.10.10.10)(PORT = 1522))    (ADDRESS = (PROTOCOL = TCP)(HOST =11.11.11.11)(PORT = 1522))    (ADDRESS = (PROTOCOL = TCP)(HOST =12.12.12.12)(PORT = 1522))    (ADDRESS = (PROTOCOL = TCP)(HOST =13.13.13.13)(PORT = 1522))    (ADDRESS = (PROTOCOL = TCP)(HOST =14.14.14.14)(PORT = 1522))    (ADDRESS = (PROTOCOL = TCP)(HOST =15.15.15.15)(PORT = 1522))   (CONNECT_DATA =      (SERVER = DEDICATED)      (SERVICE_NAME = orclgg)    )) $ strace -tT -f tnsping client_con 2>&1 | grep  'connect' 09:20:05 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("10.10.10.10")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000047> 09:20:06 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("11.11.11.11")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000041> 09:20:07 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("12.12.12.12")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000050> 09:20:08 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("13.13.13.13")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000042> 09:20:09 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("14.14.14.14")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000043> 09:20:10 connect(4, {sa_family=AF_INET, sin_port=htons(1522), sin_addr=inet_addr("15.15.15.15")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000042> --//缺省RETRY_COUNT=0.