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Virtual memory mapping mechanism of Linux programs

1 Explanation of virtual memory: The core concept of virtual memory is that the memory address used by the code is not related to the physical address.In user space, the virtual address a of a process points to different physical memory, not to the address of another process.Any time the CPU sends an instruction to the memory to access the data, the software converts the data of the virtual address into the physical address.The work of turning a virtual address into a physical address into a phy

Front-end essential Artifact Snap.svg the _jquery of dynamic effect

accelerated action. Bounce, like his graph, is generally used as a small ball to the landing of the dynamic effect. and elastic generally used in the same as the strings of the dynamic effect, this dynamic effect is a feature is part of the offset to the negative coordinates, and b-c used is this, the following figure. Depending on the path that has been drawn above, the animation will come out of the code: Copy Code code as follows: var svg=

Configuring the local domain for the SMTP service in Windows 2003

steps xx: Start the MicrosoftInternet Information Services (IIS) Manager or open the IIS snap-in. Expand Server_Name, where server_name is the name of the server, and then expand the SMTP virtual server that you want (for example, the default SMTP virtual server). Click a field. In the right pane, right-click the default domain, and then click Rename. Type the name you want to use, and then press ENTER. Quit IIS Manager or close the IIS

Basic principles of writing for search

How do you make your site attractive to search engines? The best basic principle for writing about search is: "Write to people first, not search engines." A common search marketing Novice's response is to search engine optimization for all things that tend to go extreme to learn the minutiae of each search ranking algorithm, and to overly analyze and tune their site, using each method they can think of to attract search engines. Want to "catch up algorithm", through continuous repetitive optimi

Migrating FRS to DFSR SYSVOL

to the[drive: \]windows_folder\SYSVOL_DFSR folder. The migration copy process will be includedin the [drive: \]windows_folder\sysvol folder and the Sysvol folder migrated to[drive: \]Windows_ Folder\SYSVOL_DFSR. This copy cadence takes a different amount of time depending on the size of the Sysvol folder. 4) Use DFS Management snap-in to create an analysis report of SYSVOL_DFSR files with Domain Admins administrator Note: Periodically perform DFS R

Linux Advanced Programming--04.gdb Debug Program (set breakpoints)

To debug a program that is already running Under UNIX, use PS to see the PID (Process ID) of the running program, and then use the GDB PID format to hook up the running program. First, using GDB to correlate the source code, and GDB, in gdb with the attach command to hook up the process PID. Use the detach to cancel the hook process. Pause/Resume Program runIn the debugger, it is necessary to pause the program, and GDB can conveniently pause th

The Linux platform generates AWR reports

1. The server where the database used by the Oracle user logs on to the application server# su–oracle2. Enter the ENV command to query the Oracle_home directory3. Then go to the $oracle_home/rdbms/admin directory and query the AWR statement (this step can be ignored)Here you can omit the 2,3 step directly and execute the following command directly:CD $ORACLE _home/rdbms/admin4. Sign in with SYSDBA Sqlplus/as SYSDBA5. Enter @awrrpt in the Sqlplus6. Start by following the prompts, first select the

GDB Learning Notes

Set breakpointsb Main; At the main () entranceb 148; In line 148thviewing breakpointsInfo bRun the programRSingle statement executionNContinue running the programCPrint the value of the variable iP IViewing the function stackBtExit functionFinishThe help command is just an example of the type of GDB command, and if you want to see the commands in the category, you can see all the commands that set a breakpoint by using the helps tab complements the function name, command nameIn gdb, we can pause

How to synchronize two databases in Oracle (using the materialized view) (oracle snapshot instance)

the create_snapshot. SQL script in db2. SQL> spool d: \ snap \ create_snapshot. SQL> SELECT 'create SNAPSHOT db2. '| TABLE_NAME | 'pctfree 10 PCTUSED 40 TABLESPACE snapshot_ts' | 'Storage (initial' | INITIAL_EXTENT | 'Next' | NEXT_EXTENT | 'pctincrease 0) '| 'as SELECT * FROM db1.' | TABLE_NAME | '@ testLK;' FROM USER_TABLES; SQL> spool off; note that the script used to generate the required table snapshot has some limitations. If the table to genera

How to collect AWRReport from Oracle Database

/admin/awrrpt. SQL. If the environment variable is incorrect on the EBS server, you can use a path similar @/U01/oracle/mydev213/db/tech_st/11.1.0/rdbms/admin/awrrpt. SQL 3. The output type of the input report. The default value is html. You do not need to change it. Press enter. 4. Enter the data to be collected from now on for a few days. I usually see the data from the previous day. 5. after entering the time, all the snap shots will be listed,

[Essence] FreeBSD-FAQ (2)

3: I am now learning how to use FreeBSD. Where should I start? Resources for newbiesHttp://www.freebsd.org/projects/newbies.html 4: Where can I get the FreeBSD CD?Ftp://ftp.freebsd.org/pub/FreeBSD/releases/i386/ 5: How should I install FreeBSD? Http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/install.html)Http://www.freebsd.org.cn/snap/doc/zh_CN.GB2312/books/handbook/install.html) 6: Are there any FreeBSD tutorials? The best authority is t

MySQL Backup recovery based on LVM Snapshot

interaction interface after the read lock request arrives In the innodb table, even if a read lock is requested, InnoDB may still perform read/write operations in the background. You can use "mysql> show engine innodb status;" to view the STATUS of background processes, after no write request is sent, back up the data.4.2 create a snapshotCreate a 1 GB snapshot volume data-snap in read-only mode:[Root @ mariadb mysql55] # lvcreate -- snapshot/dev/myg

Basic knowledge of Group Policy and Group Policy Editor

Group PolicyWhat is it? What is the function? How to enable and useGroup Policy EditorWhat about it? Detailed answers are provided below. Use Group Policy In Microsoft Windows XP, you can use group policies to define user and computer configurations for users and computer groups. By using the Group Policy MicrosoftManagementConsole (MMC) snap-in, you can create specific desktop configurations for specific users and computer groups. The group policy se

Altiumdesigner Study Notes (i)--Create engineering and schematic documents

I. Create engineering and schematic documents 1. Create a PCB project from the menu(1) FILE-NEW-PROJECT-PCB project to create a new PCB project in the current workspace(2) The new project does not create the file directly on the hard disk and needs to be saved: In the Project panel, right-click the new project name-Save project, in the popup dialog box, select the project storage directory (typically create a new dedicated catalog for the new project) and name the project.2. Add the principle fi

CAD controls using tutorials to customize the implementation of entities

){Case 0:m_start= M_start + offset; Start Point is editedBreakCase 1:m_end= m_end + offset; End Point is editedBreakCase 2:m_start= M_start + offset; Midpoint is editedm_end= m_end + offset; Midpoint is editedBreak}Returnmcad::eok;}1.6 getgeomextentsOverloads the virtual function to return the outsourced rectangle for the custom entityVC Interface:Virtual Acad::errorstatus getgeomextents(acdbextents extents) const;Parameters:extents Returns the custom Entity outsourcing rectangle box.Reference

Common Ceph Operations Commands

1. RBD LS View the image of the Ceph default resource pool RBD2.RBD Info xxx.img View xxx.img specific information3.RBD RM xxx.img Delete xxx.img4.RBD cp aaa.img bbb.img copy image aaa.img to Bbb.img5.RBD rename aaa.img bbb.img rename aaa.img to Bbb.img6.RBD Import aaa.img The local aaa.img into the Ceph cluster7.RBD Export aaa.img aaa.img the Ceph cluster to a local8. Import the original VM image, format 2,–order 25 to indicate object size is 32MRBD Import–image-format 2 win2008_32.img rbd/win2

How to use LVM snapshot (snapshot) backup

failed after 0 of 4096 at 0: input/output error Well, this snapshot has been released, so the only thing to do is to delete it. # Lvremove/dev/vg/lvdata-sp /Dev/vg/lvdata-sp: read failed after 0 of 4096 at 0: input/output errorDo you really want to remove active logical volume "lvdata-sp "? [Y/n]: yLogical volume "lvdata-sp" successfully removed B) use snapshot to back up the MySQL database online (or other databases) The process is to first perform a flush operation, lock the table, create a s

Minimal AWR report collection guide

for num_days: The console prints a series of similar information: Snap Instance DB Name Snap Id Snap Started Level -------------------------------------------------------- Ora11g ORA11G 1789 20 Jun 2011 1 1790 20 Jun 2011 1 5. When the following information appears, select the corresponding Snap Id from the previous l

MySQL backup solution under FreeBSD

all the files to the backup directory.#Echo "[backupmysql_fullly]"DateToday = 'date + "% Y _ % m _ % d "'Logdir =/logs/mysqlDatadir =/data/mysqlBkdir =/backup/mysql/$ today/full_backupExpdays = 7If [! -D $ bkdir/$ today]; thenMkdir-p $ bkdirFi# Stop synchronization, refresh logs, and refresh tablesEcho "stop slave; flush logs; flush tables ;"Mysqladmin-uroot stop-slaveMysqladmin-uroot flush-logsMysqladmin-uroot flush-tablesCd $ logdir# Backing up log filesEcho "backup errro log"Cp $ logdir/erro

Some tricks! Unity Tips (daily use)

.) Unity provides us with a shortcut key for the first or last sibling node in a node.Under the Gameobject menuSelf-Test9, how to Undock the preview window (that is, select an object or resource at the bottom of the Inspector panel)For example, select an audio resource and then right-click on the red box in the upper part of the preview window to eject, and the popup window will return to docked state!10. Snap TipsIn order to make the vertex fit of th

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