Cisco has become a leader in the communication industry, and its product performance is still very good. Here we mainly explain the common problems and solutions of Cisco switches. Here we will share with you some of them, I hope it will be useful to you.
Cisco switch FAQ 1: What switches Does Cisco currently support layer-3 switching?
Answer: Catalyst 2948G-L3, Catalyst 4908G-L3, Catalyst 4003, Catalyst 4006, Catalyst 5000, Catalyst 6000, and Catalys
. reentrantLock;/*** Java thread: Lock ** @ author leizhimin 2009-11-5 10:57:29 */public class Test {public static void main (String [] args) {// create an account for concurrent access MyCount myCount = new MyCount ("95599200901215522", 10000); // create a Lock Object lock Lock = new Reentrant Lock (); // create a thread pool ExecutorService pool = Executors. newCachedThreadPool (); // creates some concurrent access users, one credit card, the storage, and the retrieval. It's very interesting.
This article describes the use of Springboot timed tasks, springboot by default has been implemented for us, only need to add the corresponding annotations can be implemented.1.pom configuration filePom Bag only need to introduce springboot starter bag.true2. Startup class Enable timingThe timer can be turned on by adding @enablescheduling to the Startup class.@SpringBootApplication@EnableScheduling Public class springbootapplication { publicstaticvoid main (string[] args) { Springa
executed. As long as we are concerned about which system calls take longer, we look at the output file Vim.truss with less and quickly find the doubt: 735:0.000021511 socket (0x2,0x1,0x0) = 4 (0x4)735:0.000014248 setsockopt (0x4,0x6,0x1,0xbfbfe3c8,0x4) = 0 (0x0)735:0.000013688 setsockopt (0x4,0xffff,0x8,0xbfbfe2ec,0x4) = 0 (0x0)735:0.000203657 Connect (0x4,{af_inet 10.57.18.27:6000},16) err#61 ' Connection refused '735:0.000017042 Close (4) = 0 (0
})();
07
//do something
08
counter.inc();
09
//do something else
10
counter.inc();
11
varc_value = counter.get(); //now c_value is 2
In this way, a variable i is maintained in memory, and the value of I is not directly manipulated anywhere else in the program, only through the two operations of the counter.At SetTime
called externally, G can access the internal variables of F. According to this feature, you can write a lot of elegant code.
For example, to make a unified counter on a page, if you write it in a closed package, you can say:
Copy Code code as follows:
var counter = (function () {
var i = 0;
var Fns = {' Get ': function () {return i;},
' Inc ': function () {return ++i;}};
return FNS;
})();
Do something
Counter.inc ();
Do something else
Counter.inc ();
var c_va
The basic usage of grouping functions is described earlier, and several more advanced uses of group by are described below.
1, rollup in Oracle database with the GROUP BY command, you can provide summary of information functions (similar to subtotals)
Sql> SELECT Deptno, Job,sum (SAL) from EMP1 Group by Deptno,job
2 order by Deptno,job;
DEPTNO JOB SUM (SAL)
---------- --------------------------- ----------
Ten Clerk 1300
Ten MANAGER 2450
Ten PRESIDENT 5000
Exception {Thread.Sleep (6000); Logger.info ("Current time: {}", Dateformat.format (New Date ()); The/** * Fixedrate property defines the schedule interval. The schedule does not wait for the last scheduled execution to complete. * * @Scheduled (fixedrate = 5000) publicvoid Testfixedrate () throws Exception {Thread.Sleep (6000); Logger.info ("Current time: {}", Dateformat.format (New Date ()); Th
When assigning a value to the IP address structure, the function htonl,htons,inet_addr is often used , and the function corresponding to the sockaddr_in is ntohl,ntohs,inet_ntoa.
Looking at the parsing of these functions, it is found that these functions are actually related to the conversion between the host byte order and the network byte order .
What is the network byte order, and what is the host byte order?
Here's a conversion between them:
Use IP address 127.0.0.1 as an example:
First ste
resides [yearlysalary] [float] NULL,--Customer Annual Income [Boughtcar] [bit] NULL,--whether the customer has purchased a car CONSTRAINT [Pk_customersboughtcarssurvey] PRIMARY KEY CLUSTERED ( [CustomerID] ASC) with(Pad_index= OFF, Statistics_norecompute= OFF, Ignore_dup_key= OFF, Allow_row_locks= on, Allow_page_locks= on) on [PRIMARY]) on [PRIMARY]Now if there are 10000 rows of records in this table, of which the [customerid],[name],[age],[sex],[nation],[city],[yearlysalary] column
. Based on this feature, you can write a lot of elegant code.
For example, if you want to make a uniform counter on a page, you can write it like this if you use the closure statement:
The Code is as follows:
Var counter = (function (){Var I = 0;Var fns = {"get": function () {return I ;},"Inc": function () {return ++ I ;}};Return fns;})();// Do somethingCounter. inc ();// Do something elseCounter. inc ();Var c_value = counter. get (); // now c_value is 2
In this way, a variable I is maintain
() - Try{...} - finally{readlock.unlock ()} + } -4write locks on all modified methods: + Public Doubletransfer () { A Writelock.lock () at Try{...} - finally{writelock.unlock ()} -}Take a look at a specific example: Locktest.java1 PackageThread;2 3 ImportJava.util.concurrent.ExecutorService;4 Importjava.util.concurrent.Executors;5 ImportJava.util.concurrent.locks.Lock;6 ImportJava.util.concurrent.locks.Re
The following information is frequently displayed in the alert of the two nodes in the database of 11.2.0.2:[Html]**************************************** *******************************Fatal NI connect error 12170.Version information:TNS for IBM/aix risc System/6000: Version 11.2.0.2.0-ProductionTCP/IP NT Protocol Adapter for IBM/aix risc System/6000: Version 11.2.0.2.0-ProductionOracle Bequeath NT Protoco
Hubble vs StringDefault valueDICT.DCT 178740Query statementsSelect Top Score,name,addtime from WHOLESEARCH_CN where Name match ' uac^2^2 6000^1^1 ' ORDER BY score desc, Addtime descGroup queriesGroupBy (' Count ', ' ID ', ' TypeID ', 10)]Select between 0 to 9 id,name,typeid,seo_d,typename,strurl,addtime from WHOLESEARCH_CNwhere(Name Contains ' uac^5^0 6000^1^3 uac6000^5^0 'or Name Match ' uac^5^0
least I know that the current communication students, except for Level 4 students, have a lot of room to choose their jobs-think carefully
I think about what you should do. You were 18 years old when you chose your current major four years ago. Now you are over 20 years old and want
Methods must change. In fact, there are many opportunities for job placement in my senior year. One undergraduate graduate is still young and has no family,WeddingThe pressure on the house supply, or the age of lear
Object "h1 ". "trdx_fee_table" failed to load/unload and is being skipped due to error: ORA-31640: Unable to open dump file "/oraapp/Oracle/backup/newdb.20140918.dmp" for readORA-19505: failed to identify file "/oraapp/Oracle/backup/newdb.20140918.dmp" ORA-27037: unable to obtain file statusibm aix risc system/6000 error: 2: no such file or directoryadditional information: 3ora-000093: table Data Object "h1 ". "trdx_q" failed to load/unload and is be
Many people have asked similar questions on the Internet: "What does it mean when someone writes an SQL statement like where 1 = 1 ?". In fact, developers generally use dynamic array SQL statements.
Let's imagine the following scenario: users require a flexible query interface to query employee information based on various complex conditions, such:
The interface lists four query conditions, including query by employee ID, query by name, query by year, and query by salary. A check box is displ
-release
The vim version is 6.2.154. After running vim from the command line, it takes nearly half a minute to enter the editing interface without any error output. I carefully checked that. vimrc and all vim scripts have no error configuration, and I cannot find a solution to this problem on the Internet. Is it hard to get a hacking source code? It is not necessary to use truss to locate the problem:
# Truss-f-D-o vim. truss vim
Here, the-D parameter is used to add a relative timestamp befor
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