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Oracle Default User Rollup

Authenticationcredentialseverbeassignedtoxs$null BI The account is owns the business Intelligence schema included in the Oracle Sample Schemas. Pm The account is owns the Product Media schema included in the Oracle Sample Schemas. Ix The account this owns the information Transport schema

20th Chapter-Development Delphi Object Type Data management function (i)-(1)

stream, the Readbuffer method causes the Ereaderror exception event. 6. Readcomponent method Statement: function Readcomponent (instance:tcomponent): tcomponent; The Readcomponent method reads the part specified by instance from the current stream, and the function returns the part that is read. Readcomponent creates a reader object and invokes its Readrootcomponent method when reading the instance and all the objects it owns. If the method insta

Oracle user, authorization, role management

for database management. Oracle recommends that users design their own database management and security rights planning instead of simply using these predefined roles. In future releases, these roles may not be used as predefined roles.2. Delete_catalog_role, Execute_catalog_role, Select_catalog_roleThese roles are primarily used to access data dictionary views and packages.3. Exp_full_database, Imp_full_databaseThese two roles are used for the data Import Export tool.4. Aq_user_role, Aq_admini

Python multithreaded 1:threading

supports the context management protocol.Class Threading. RlockThis class implements a Reentrant lock object. A reentrant lock must be released by the thread that requested it, and once a thread has a reentrant lock, the thread can request it again, noting that the number of times the lock must be requested corresponds to the number of times the lock was released.Note that Rlock is actually a factory function that returns an instance of the most efficient Rlock class version supported by the cu

Java Multithreading High concurrency learning

used by only one thread at a time. Mutex: The critical section, the mutex, and the semaphore. Synchronized keywords : After compiling, the Monitorenter and monitorexit Two bytecode instructions are formed before and after the synchronization block. All two instructions require a parameter of a reference type to indicate the object to lock and unlock. If the object parameter is not explicitly specified, then the corresponding object instance or class object is taken as the lock object accor

A detailed introduction to the Python Magic method

set , and the delete method is implemented: get(self, instance, owner):Defines the behavior when the value of the descriptor is taken. Instance is an instance of the object that owns the descriptor. Owner is the owner itself set(self, instance, value):Defines the behavior when the value of the descriptor is changed. Instance is an instance of the class that owns the descriptor. Value is the values

How to implement genetic algorithm in Go language

, but it is noteworthy to one person. Go is compiled locally, such as C. When binary executes, it seems to spit out an answer right away. Here's an easy way to measure the execution time of each run: func main() { beforeQuadTime := time.Now() quadraticMain() afterQuadTime := time.Since(beforeQuadTime) fmt.Printf("%d\n", afterQuadTime) before3dQuadTime := time.Now() quadratic3dMain() after3dQuatTime := time.Since(before3dQuadTime) fmt.Printf("%d\n", after3dQuatTime)} Side note: Ca

SetWindowPos function Explanation

used, see the Description section.X: Specifies the left edge of the window's new location in customer coordinates.Y: Specifies the top boundary of the window's new position in customer coordinates.CX: Specifies the new width of the window in pixels.CY: Specifies the new height of the window in pixels.Uflags: The window size and positioning of the logo. This parameter can be a combination of the following values:Swp_asncwindowpos: If the calling process does not own a window, the system makes a

Industry worries about the suspension of MySQL

Oracle is a major commercial database giant, while Sun owns a world-renowned open-source database MySQL. What is the fate of MySQL? Will it be replaced by Oracle ldquo? Oracle is a major commercial database giant, while Sun owns a world-renowned open-source database MySQL. What is the fate of MySQL? Will it be replaced by Oracle ldquo? Oracle is a giant in commercial databases, while Sun

Delphi's component reading and writing mechanism

application that started running, Application.createform (TForm1, Form1) to create the necessary forms, The Application.Run program starts running and enters the message loop.Now we are most concerned about the creation of the form of this sentence. How is the form and the components on the form created? As mentioned earlier: all components in a form include the properties of the form itself in the DFM file, and when Delphi compiles the program, the DFM file information is compiled into the exe

C # multithreaded Learning (vi) Mutex objects

C # multithreaded Learning (vi) How the mutex controls the connection of multiple threads to each other, does not create conflicts and duplicates, requires the use of mutex objects, namely: The Mutex class in the System.Threading namespace. We can think of a mutex as a taxi and a passenger as a thread. Passengers first wait for the bus, then get on the bus and finally alight. When a passenger is in the car, the other passengers are only allowed to get on when he gets off the bus. The same is tru

[Apue] Files and directories

file is set, a text of the program body is saved in the swap area the first time the program executes and ends. (The body part of the program is the machine Instruction section.) This enables the next time the program executes, it can be loaded into the memory area more quickly. The reason: In the swap area, the file is stored continuously, and in the general U N I x File System, the file's data blocks are likely to be stored randomly. Common applications, such as text-editing programs and part

SQL2000/Sql2005 users cannot be deleted solution

SQL Server Delete User steps 1, SQL Server MANAGEMENT studio--database-"security-" framework, first delete the corresponding framework 2, SQL Server MANAGEMENT studio--database-"Security-" users, delete the corresponding user to delete the corresponding schema, and then delete the corresponding users. The above method I can't delete the user SQL Server 2000 cannot delete a user's workaround. This problem was encountered today when data was being transferred, and the solution was as follows:

"Turn" deeply explores the difference between mutex and semaphore (bottom)

shortest possible time. Based on this, Mutex_lock's slow path section tries to avoid going to sleep, trying to wait for the process that owns the mutex to release it through a brief spin. The main structure of the __mutex_lock_common is two for loops, in which the judgment logic of whether the lock can be acquired again is added./** Lock a mutex (possibly interruptible), Slowpath:*/static inline int __sched__mutex_lock_common (struct mutex *lock, lon

QT Smart Pointer Learning (7 kinds of QT Smart pointers and 4 STD smart pointers)

linked list with three elements have a head node N0; That node holds a shared_ptr object that owns the next node, N1; That node holds a shared_ptr object that owns the next node, N2; That node, in turn, holds a shared_ptr object that owns the head node, N0, closing the cycle. In this situation, none of the reference counts would ever become zero, and the nodes i

Deadlock and hunger

by the system, not meeting the needs of each process; and unreasonable process Promotion order when multiple programs run. It can be seen that there are at least two deadlocked processes in the case of a deadlock. We can give a simple example to learn about deadlocks: P1 P2 ... ... Request () Request (B) Request (B) Request () Request (B) Request () Request () Request (B) If both parties have part of the resources (

Use MFC to write an internet query Program

protocol to send whois queriesAnother protocol can also provide URL-related information. It is also an old protocol. MFC does not directly support it. This is the whois protocol. On the internet, only a few servers provide the whois service. The whois service creates a domain name database on the internet. If a whois query is performed on a domain name, the server returns the actual name, address, phone number, and other information of the organization or individual that

C # multi-thread Learning (6) series of mutually exclusive objects) -- continue to search engine research

The mutex class in the system. Threading namespace is used to control the connections between multiple threads without conflict or repetition. We can regard mutex as a taxi and passengers as a thread. The passenger first waits for the car, then gets on the bus, and finally gets off the bus. When a passenger is on the bus, other passengers can only get on the bus after they get off the bus. This is also the relationship between the thread and the mutex object. The thread uses mutex. the waitone

Clarify the File Permission methods for PHP Execution under Linxu,

. Take the abc folder as an example: d | rws | r-x In the abc folder, the owner owns rwx (7), the group owns rx (5), and the other owns rx (5 ). Similarly, the red part of the file above is the name of the owner and the name of the group, that is, the owner of the abc folder is root and the group is root. At this point: A. If the root user accesses this abc fold

Unix shell-01 File

There are three methods to access a file:1. Read. The content of this file can be displayed.2. Write, delete or edit the file.3. Run a shell script or programUsers of files can be divided into three types:1. File owner, that is, the creator of the file.2. users in the same group, that is, any user in the group that owns the file3. Other users do not belong to a user in the user group that owns the file.1.1

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