1, LONG data type is stored in the variable-length string, maximum length limit is 2GB. 2, for beyond a certain length of text, the basic type can only be used to store LONG, many of the data dictionary definition of the object is to use LONG to stor
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First, the database system architecture 1, table space monitoring 2, monitoring tablespace usage and free space the size of the statement 3, table space with the ability to automatically expand space 4, using dictionary-managed tablespace extension t
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Library Cache Statistics 1. When you change the objectives of the shared pool of soft parsing SQL statements. reload: reload object is invalid or changes in use need to reload. to reduce the reload value. INVLIDATIONS: in v $ librarycache, the number
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1 into the TIMESTAMP database type from the date 2.mybatis the same, jdbcType = TIMESTAMP Then is a normal write sql statement 3.java no change in 4. Struts2 front shows the date labeling available
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LONG columns can not appear in some parts of the SQL statement: 1, in the WHERE, GROUP BY, ORDER BY, CONNECT BY clause and a DISTINCT operation of the SELECT statement. 2, SQL functions (such as SUBSTR or INSTR) 3, expression or condition. 4, contain
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table a (id, type): id type ---------------------------------- 11 21 32 table b (id, class): id class --------------------------------- 11 2 2 sql statement 1: select a. *, b. * from a left join b on a.id = b.id and a.type = 1; sql statement 2: selec
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table a (id, type): id type ---------------------------------- 11 21 32 table b (id, class): id class --------------------------------- 11 22 sql statement 1: select a. *, b. * from a left join b on a.id = b.id and a.type = 1; sql statement 2: select
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LONG columns can not appear in some parts of the SQL statement: 1, in the WHERE, GROUP BY, ORDER BY, CONNECT BY clause and a DISTINCT operation of the SELECT statement. 2, SQL functions (such as SUBSTR or INSTR) 3, expression or condition. 4, contain
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cmd remote login server database command Coming into the mysql bin directory -> mysql-h 192.168.1.231-u root-p (- H 'h' in the host) Landing the machine with the mysql-u root-p, Password can not be directly behind the increase, can be added to the da
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concurrent_insert by looking at the show variables like '% concurrent%' 0: not complicated, Select, insert only between the serial execution 1: The table has holes (left by deleted records) cases, blocking insert; table in the case of non-empty, Inse
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System running for some time error: java.sql.SQLException: ORA-01000: maximum number of open cursors exceeded View the current number of cursors database configuration slqplus: show parameter open_cursors; View cursor usage: select o.sid, osuser, mac
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1, LONG data type is stored in the variable-length string, maximum length of 2GB. 2, for beyond a certain length of text, the basic type can only be used to store LONG, many of the data dictionary definition of the object is to use LONG to store. 1,
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NO1. The general struture of execution section is: NO2.expresstion: PL / SQL exceptions consists of one or more PL / SQL variables conbined one or more PL / SQL operators. An exception may appear in one of the following locations: 1.On the right side
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Activity Life Cycle: The next method name describes the method call onCreate () When the Activity was first created, calling this method. This method is typically used: 1, for the Activity to be used to set the layout of file 2, such as the listener
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For the concept of abstract classes and interfaces, we are easy to confuse these two, I also like listening to the teacher Li Jianzhong, design patterns, he also said to the old interface to the abstract class, the more confused I get, So to find som
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NewRelic Rails is a provider of Web site performance monitoring service, NewRelic provide different levels of monitoring function, a free Lite version is up to a Gold version. New Relic tool has two modes: (1) Production mode: When you run the projec
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Oracle insert in a long string of Times this wrong, go online to look for most is the character set format or database-driven version of the problem. But I inserted it inside all the English characters, so the question should not be the character set
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Sub-query is embedded in other SQL statement SELECT statement, also known as nested queries. Note that when the DDL statement references a subquery, you can with the Order By clause; but when the where clause, Set reference to sub-clause query, not w
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[Sql tuning of the implementation plan] merge semi join and merge anti join Semi Join (also called half-connections) or more in the sub-query in the use of such exists, for the outer row set, look for the internal (ie, sub-query) row set, match back
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First, read what the original source: Hibernate3.6.0 English document first section of Chapter 11, reference sources: Hibernate3.6.0 Chinese document in the first section of Chapter 11 Hibernate defines and supports the following object states: 1.Tra
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3.1 statement with the block in the C language, is the statement terminator good points. 3.2 if-else statement 3.3 else-if statements 3.4 switch statement break statement will cause an immediate execution of the program completely withdraw from the s
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First look at a simple example: The following were named to three pages frame.html, top.html, bottom.html example to specify what to do. frame.html from top (top.html) under (bottom.html) composed of two pages, the code is as follows: <! DOCTYPE HTML
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Create a dynamic link library steps: First, create a Non-MFC DLL dynamic link library 1, open the File -> New -> Project Options, select Win32 Dynamic-Link Library -> sample project -> Project Name: DllDemo 2, create a new. H file DllDemo.h Th
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First look at a simple example: The following were named to three pages frame.html, top.html, bottom.html example to specify what to do. frame.html from top (top.html) under (bottom.html) composed of two pages, the code is as follows: <! DOCTYPE HTML
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First look at a simple example: The following were named to three pages frame.html, top.html, bottom.html example to specify what to do. frame.html from top (top.html) under (bottom.html) composed of two pages, the code is as follows: <! DOCTYPE HTML
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Javascript refresh the current page The following were named to three pages frame.html, top.html, bottom.html example to specify what to do. frame.html from top (top.html) under (bottom.html) composed of two pages, the code is as follows: <!DOCTYPE H
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Suppose a class as follows: class Integer { private: int i; public: Integer(int I):i(I){ } const Integer operator+(const Integer &rhs) const; friend ostream& operator<<(ostream& os, const Integer &integer); }; const Integer Integer::
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1. Note that the problem is called multi-threaded, to avoid global variables. 2. Called the method requires extern "C" __declspec (dllexport) statement. 3. Type conversions need to clear. Then easy to use basic data types. Next added. . .
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1,1 = 1,1 = 2, the use of combinations in the SQL statement is used more "Where 1 = 1" is expressed Select All "where 1 = 2" all non-election Such as: if @ strWhere! ='' begin set @ strSQL = 'select count (*) as Total from [' + @ tblNa
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First look at a simple example: The following were named to three pages frame.html, top.html, bottom.html example to specify what to do. frame.html by the previous (top.html) under (bottom.html) composed of two pages, the code is as follows: <!DOCTYP
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Structural conditions 1, if structural conditions if (condition) ( / / Statement ) 2, if else condition structure if (condition) ( / / Statement 1 ) Else ( / / Statement 2 ) 3, if the structure of multiple if (condition) ( / / Statement 1 ) else if (
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1. Can no longer use the query definition in the Order by, unless it is included in the definition of TOP or FOR XML operators. (Note: TOP is not ANSI standard statement) 2. All the results shown must have a name. So it is best not to use "SELECT *&q
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Session to perform some sql statement to the state of objects in memory synchronized to the database, a process called session clean-up. By default, Session at the following time points clear cache. 1 When an application calls net.sf.hibernate.Transa
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By Altair, http://www.phpinternals.com reproduced please specify this information Yesterday, a friend in Hangzhou, PHPer group which posted the following piece of code and give some results: Source: <? Php function doTicks () ( echo 'Ticks'; ) regist
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Set: 1. Point "window" -> "Preferences" -> "Java" -> "Installed JRES" 2. Then "Installed JRES" is the right list pane, lists the system JRE environment, choose your JRE, then the edge of the "
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1, to Invalidate () replaced InvalidateRect () Invalidate () will cause the entire window redraw the image, need to spend more time, but InvalidateRect () Rect only redraw the content region, so time will be less. Bugs ago lazy, often a small area of
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gVim off automatic backup set April 19, 2010 Monday 12:16 gVim default, edit the file with, it will automatically generate a backup file with ~. However, sometimes the backup is not practical, and possibly annoying. Can be closed the following method
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Reprinted: http://www.talentdigger.cn/home/space.php?uid=3821&do=blog&id=19384 SQL Summary DML, DDL, DCL, Transaction Summary 1. SQL statement category (five categories): Select statement DML: insert \ update \ delete \ merge (Oracle unique for da
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1.hibernate3.3.2 log configuration, the default address using slf log, slf only interface, the slf distribution package has the support of other logging frameworks (Adapter), adding slf4j-log4j12-1.5.8 package and then adding the corresponding log4j
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General point that: Interface = defines all the things to do, but I was not doing Sha made a part of the abstract class = total to do the rest, he quit, so then continue to the completion of an abstract class: Abstract class is a special class, but c
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In JDK 1.5 in the form of a real object-oriented SQL statement 4 (with source code, code generation tools) In JDK 1.5 in the form of a real object-oriented SQL statement 3 (with source code, code generation tools) Design Notes First, use the bridge p
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An abstract class: Abstract class is a special class, but can not be instantiated; In addition, other characteristics of a class; important is the abstract class may include an abstract way, this is normal classes can not. Abstract methods can only b
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Fun combat tutorial oracle (seventh day) Introduction 1. On the section reviews 2.pl/sql Advanced √ 3.oracle view (with security, and simplify complex query functions) √ 4.oracle trigger √ Desired goals 1. Master pl / sql Advanced usage (paging proce
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<1> asp Write In "%%> in <% Statement ... ... %> <2> define variables dim statement <% dim a, b a = 10 b = "ok!" %> Note: The definition of variables can be numerical, it can be characters or other types of <3&
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Table Structure Table name projectinfo project_id, parent_project 001 null ---------------------------- 002 001 ----------------------------- 003 001 ----------------------------- 004 null ----------------------------- 005 004 -----------------------
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Notes 1 set used in PLSQL Overall in PLSQL collections in general are: 1. Index Table, also known as associative arrays, you can let us use the numeric or string as subscript to find the element. (This is a bit of hash and other languages similar app
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[Size = x-small] [size = x-small] Session interface is the Hibernate to operate the database application provides the main interface, it provides a basic save, update, delete, and query methods. Session has a cache, the cache is located in a persiste
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Here are some well-known large-scale online mall, because of system problems caused by security attacks: 1,2009 on August 9 Jingdong Mall Home by a number of negative phenomena in commodity prices, causing the whole site can not properly place an ord
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These days there are several partition table on the SQL implementation of the plan is not normal, feel should not have set a few easily lead to the wrong execution plan optimizer parameters of the. ALTER SYSTEM SET OPTIMIZER_DYNAMIC_SAMPLING = 0; ALT
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oracle in a summary of long type 1, LONG data type is stored in variable-length string, maximum length limit is 2GB. 2, for beyond a certain length of text, the basic type can only be used to store LONG, many of the data dictionary definition of the
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