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1 Introduction The Concurrent.futures module provides a highly encapsulated asynchronous calling interface Threadpoolexecutor: thread pool, providing asynchronous call Processpoolexecutor: Process pool, providing asynchronous calls both implement The same interface, which is defined by the abstract Executor Class.2 Basic Method Submit (FN, *args, **kwargs) asynchronous commit task Map (func, *iter Ables, Timeout=none, chunksize=1) replaces the For Loo

forward-m time--timestart 08:00:00--ti Mestop 17:59:59! --weekdays 6,7-o eno16777736-j REJECT 5.state Extended Connection status detection, based on the connection tracking mechanism; Conntrack related options: [!]--state State IPT Ables Definition of connection state: INVALID, established, NEW, related or untracked; Inva LID: UnrecognizedConnection state, invalid communication state; Syn,fin established: The state of the conne

that are actually no longer needed. Whether the garbage collection mechanism can solve the dilemma of circular reference, with this query to find some information, found a more satisfactory explanation. In Appendix A of the book "Java Platform performance:strategies and Tactics," one of the instructions is that the book comes from Employees of the Sun company Java team and should be considered more authoritative. There is such a paragraph (http://java.sun.com/docs/books/performance/1st_edi

two servers are linked to the network, and need to access memcache through the extranet IP, then you can consider using a firewall or agent program to filter illegal access. Normally we can use Iptables or FreeBSD under Linux to specify rules to prevent illegal access, such as we can set up our web servers to access our Memcache servers while blocking other access. # iptables-f # iptables-p INPUT DROP # iptables-a input-p tcp-s 192.168.0.2–dport 11211-j ACCEPT # IPT

Http://www.ipdeny.com/ipblocks/data/countries/cn.zone With all the IP addresses of the country, it's easy to block these IPs, write a script to read Cn.zone files line by row and add to Iptables: code is as follows copy code #!/bin/bash # block traffic from a specific country # written by vpsee.co M COUNTRY = "cn" IPTABLES =/sbin/iptables Egrep =/bin/egrep If ["$ (id-u)"!= "0"]; then Ech O "You must be root" 1>2 Exit 1 Fi Resetrules () { $IPTABLE

View the system's Nls_lang settings before exporting: Echo $NLS _langAmerican_america. zhs16cgb231280 Select Userenv (' language ') from dual;American_america. Zhs16gbk The difference between the two values is an error: Exp-00091:exporting questionable statistics The cause of the problem:The user environment variable language set in Linux is different from the environment variable language set in the Oracle database.Solution:Set the user environment variable language set and database under

CROS_SDK--Cros Flash--board=${board} usb:/$USB _device Install ChromiumOS on Chromebook Enter Chromebook into Dev-mode This are highly device specific, and depends on how the manufacturer of your device-has chosen to implement the Dev-mo De switch. A partial list of devices and how to enter them into Dev-mode can is found here. Flash ChromiumOS to Chromebook Fire up your chrombook device and hit Ctrl+alt+back, followed by ' Chronos ' and hit enter. Followed by the "below command to install

allocated for all DAT Abase segments user_sequencesdescription of the user ' s own sequences user_snapshotssnapshots the user can look at User_sna Pshot_logsall snapshot logs owned by the user user_sourcesource of stored objects-accessible to the user user_synonymsthe User ' s private synonyms user_sys_privssystem privileges granted to current user user_tablesdescription of the user ' s own t Ables USER_TABLESPACESDEScription of accessible tablespace

Ables Arptables-f Clear Filter All rules Arptables-l-N List Filter all rules2. Configure ArptablesLinux server's gateway Mac is 00:24:51:e9:c7:10, the same network segment another server 192.168.1.10 (host name is nh-blade-67) MAC address is 00:17:a4:a8:68:11.To configure the ARP firewall with the command line:On the eth0 if the source IP is 192.168.1.10, and the source Mac is not 00:17:a4:a8:68:11, then prohibit this data frame.CODE:/usr/local/sbin

More than 2004-02 MapleA. Export tool exp 1. It is the next executable file storage directory for the operating system/oracle_home/bin The EXP export tool compresses data backups in a database into a binary system file. Can migrate between different OSIt has three different modes:A. User mode: Export all user objects and data in the object;B. Table mode: Export all the user tables or specified tables;C. Entire database: Export all objects in the database. 2. Export tool exp Interactive command l

(Range (5), Range (1,20,2)) [(0, 1), (1, 3), (2, 5), (3, 7), (4, 9)] >>> x= (1,2,3); y= (4,5); Z= (6,) >>> zip (x,y,z) [(1, 4, 6)]Logical implementation of Zip: def zip (*iterables): # Zip (' ABCD ', ' xy ')--> Ax by Sentinel = Object () iterators = [iter (it) for it in ITER Ables] While iterators: Result = [] for it in iterators: elem = Next (it, Sentinel) if Elem is Sentinel :

F take part on a many-to-many binary relationship r,the relationship is M apped to a representative table T in the related relational database design. The table contains columns for all arrtibutes in the primary keys to both tables transformed from entities E and F,and thi s set of columns forms the primary key for the table T. EG: (Employees-(1,n)-works_on-(0,n)-projects---n-n (Many-to-many)) Employees (Eid,straddr,city,state,zipcode)--woks_on (eid,prid,percent)--projects (prid,proj_name,due_d