different learning management systems

Poco C ++ library learning and analysis-memory management (2) 3. sharedptr Sharedptr is another smart pointer implemented based on reference count in the POCO library. Compared with autoptr, Poco: sharedptr is mainly used to provide reference counting service for classes that do not implement the reference counting function (in other words, this class itself is not a reference counting object, automatically

The db2 tutorial is: DB2 UDB V8.1 management learning notes (3 ). Force disconnect an existing connection, stop the instance, and delete it. $ Db2idrop-f instance_name Migrate instances in UNIX. $ Db2imigr instance_name Update an instance to obtain access to some new product options or revision packages. $ Db2iupdt instance_name Obtain the current instance. $ Db2 get instance When you update instance-level

the repository.You can use git show + commit code to view the details of a specific submission: ( If you do not add a commit code, only the details of the most recent commit will be displayed )You can also use Show-branch to provide a concise, single-line summary of the current development branch: [email protected] public_html]# git show-branch-more =ten[master] firsr change[master^] Initial contents of public_html6. View Submission Differences:Use the full ID name of two commits and run Git di

that the 16 consecutive entries in the thick page table hold the same large page descriptor.2.4 consecutive entries in a thin page table save the same small page descriptorMVA[19:10] For a fine-page table index] has coincident bits for mva[11:0] that are used for small-page addressing, and the descriptor saved in the Rough page table [31:12] as the base address of the physical addresses, in order to guarantee the same base, change the address, that is, the descriptor unchanged, mva[11:0] change

storage relatedVtWhat is the source of YumDownload to local cache metadata cache to local3 Types of protocol:Local file:///protocolRemote server ftp:///HTTP/Yum Warehouse:RPM PackageThe repodata/directory XML file can be used as a Yum source only if the path containing this directory is its subdirectoryRepomd.xml save time stamp to see if there are any changesPrimary.xml.gz the name and dependencies of each RPM package in the current Yum repository:also contains each RPM package to be able to i

can use to switch alt+f1-f7.6. CP file1 file2 : means to assign file1 to file2 and place it in the background. The can throw work into the background without affecting the work to be opened. , when thrown into the background, Bash will be based on this instruction a work number, throw in the background of the biggest advantage is not afraid to be the CTRL + C interrupt.7. Ctrl + Z is temporarily throwing work into the background.Jobs-l: Observe all the current work and PID in bashFG: Take back

completed in the backgroundFront desk--Backstage:CTRL + Z: Send the work in the foreground to the backstage, add a stop signal, work in the background stop runningCommand : Let commands execute in the backgroundBG: Let the stop job in the background continue to runBG [[%]jobid]Jobs: View all jobs in the backgroundJob number, different from process number+: Command will default action for jobs-: command to assign a second default action to the jobFG:

becomes a bottleneck for higher concurrency, we need to monitor and regulate these "automated" technologies.Return the time from 1960 to the present, back to our familiar Java language. In the first chapter of this article, we describe the parts of the Java Memory Runtime area, where the program counter, VM stack, local method stack three regions are born with threads, and the frames in the stack are organized into stack operations with the method entering and exiting. , how much memory is allo

perform > (redirect) cannot execute17:lsattr Special properties for reading files-a similar to Ls-a-R together with subdirectories data18: Search command Find find[path [parameter]atime Access or execution time of the filectime file Write, change owner, time of permissionMtime The time the content of the file changedstat test2 can get a file of 3 timefind-name test2 means finding files with Test2 as their name19: Common file Types-Normal fileCatalog Dl connect files like Windows shortcutsB-bloc

also deleted with the References object permissions.Example four: Recover user Xiao Ming inquires Scott's EMP tableUsing System login, execute the statement: Revoke Select on from XiaomingNote: After the object permission is reclaimed, the corresponding delivery permission is also reclaimed, and the permissions of the user who has passed and obtained permissions are also recycled. For example, the user xiaoming the right to query the EMP table to Xiaohong, and when Xiaoming's permissions are

, T, equal to this permission does not workRights Management: Rights Management: Chmod Affiliation Management: Chown, Chgrp file Matte code: Umask Modify file permissions: chmodchmod [OPTION] ... Mode[,mode] ... FILE ...chmod [OPTION] ... Octal-mode FILE ...chmod [OPTION] ...--reference=rfilefile. where the meaning of Ugoa:U:ownerG:groupO:otherA:all There are t

default password is Change_on_install.B. The system user is a management operator, has a large authority, has a sysoper role, does not have the CREATE DATABASE permission, and the default password is manager.C. In general, for database maintenance, use the system user to log on.4. The difference between SQL Server and Oracle Startup:After SQL Server----SQL Server starts, the user SA will see many databases after logging on.After Oracle is started----

| UNLOCKSummary:1, Oracle is an object-based relational database, Oracle products free, service charges.2. After Oracle installation, there are two admin users (System,sys) and a regular user, Scott, by default.3. Sql*plus is a client tool for Oracle management and data operations.4. Before the client connects to the server, the server starts the listening service, and the client tool installs the Oracle client, and the client wants to establish a loc

A. Python memory request:1, Python memory management is divided into six layers: the bottom two layers have OS control. The third layer is to call C's malloc and free for memory control. Layer fourth layer fifth is the memory pool of Python. The topmost layer allows us to manipulate the Python object directly.2, Python Application object time less than 256Byte bytes request back directly using Python's own memory allocation system, when greater than 2

NetworkManager, whether the NIC accepts NM control, CentOS6 is recommended as "no";Onboot: Whether this device is activated at system boot time;Type: interface types; common Ethernet, Bridge;UUID: The unique identification of the device; IPADDR: Specify the IP address;NETMASK: Subnet mask;Gateway: Default gateways;DNS1: The first DNS server points to;DNS2: The second DNS server points to; Userctl: Whether the ordinary user can control the device;Peerdns: If the value of Bootproto is "DHCP",

Rights Management BasicsMongoDB has a lot of user roles, here is simply to enumerate the use of commands, specific role meaning, please check the official documentation.Https://docs.mongodb.com/manual/reference/built-in-roles/#userAdminBefore you enable permission validation, you need to restart the service to turn on Auth:Examples of command use:Use admin;#创建用户, there are different methods for MONGO 3 and

, may not find the newly created file); Find files (slow search on hard disk) 3. File Default PropertiesThe user creates the file, the default does not have the executable permission namely-rw-rw-rw-; The user creates the directory file, the default all permissions are open namely drwxrwxrwx;The files and directories that are actually created also subtract the permissions default values set by Umask, for example: Umask value is 022When creating a new file: (-rw-rw-rw-)-(----w--w-) ==>-rw-r--r-

The DB2 tutorial being looked at is: DB2 UDB V8.1 Management Learning Notes (iii). Force disconnect an existing connection, stop the instance, and delete. $ db2idrop-f instance_name Used to migrate instances under UNIX. $ DB2IMIGR instance_name Update the instance to get access to some new product options or revision packages. $ DB2IUPDT instance_name Gets the instance that is currently in place. $ DB2 Get

server role is assigned to the login, it has the appropriate permissions for the database operation. That is, the server role automatically makes the login and database user mappings, and gives the appropriate database users the appropriate database permissions.6. Architecturethat is, the container for the database. Similar to opening namespaces in software. The server name . The database name . The schema name . The name of the object, which is the qualified name of a complete Table object. Pr