cgid

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MySQL uses User-Defined variable simulation analysis functions

test table is the group ID.Gid is the group ID of the previous record,Cgid is the group ID of the current record,If the gid and cgid are different, the Group ID has changed and the Rank sorting is reset.In this way, Rank is auto-incrementing according to each group, and the first N records are enough. SELECT t3.tid, t3.stat, t3.createtimeFROM (SELECT @ gid: = @ cgid

MySQL uses User-Defined variable simulation analysis functions

the status, while Createtime indicates the creation time.Queries the content of the last three records in each status. This requirement is almost unknown. But this is the MySQL database. He has no analysis function and can only simulate it with custom variables.The stat Field of the test table is the group ID.Gid is the group ID of the previous record,Cgid is the group ID of the current record,If the gid and cgid

In-depth analysis of Linux debugging tool IPCS

deleted the shared memory, The program finally deletes the shared memory, so an error is reported. We can see more detailed information through IPCS-mi 32768, as shown below: shared memory segment shmid = 327680 Uid = 0 gid = 0 cuid = 0 cgid = 0 Mode = 0666 access_perms = 0666 Bytes = 4096 LPID = 3263 CPID = 3263 nattch = 0 Att_time = mon Mar 14 09:42:52 2011 Det_time = mon Mar 14 09:43:22 2011 Change_time = mon Mar 14 09:42:52 2011 Note: Cuid = 0 in

Mysql Common SQL statement Collection

nbsp ( select b.*, @gid: = @cgid, @cgid: = B.uid, N Bsp if (@gid = @cgid, @rank: = @rank + 1, @rank: = 1) rank, NBSP;[EMAILNBSP;PROTECTE D] Flag from ( select NB Sp distinct uid, NBSP ; date_format (Create_time, '%y-%m-%d ') create_time, datediff (Create_time,now ()) Diff from test_sign_his

apache2.4.27 Compiling and installing

) for the purposes of the same name, the main application for the upper layer provides an underlying support interface library that can be used across multiple operating system platforms.Method One: Insert method installationDescription: Insert method installation (i.e., embedded Apr package), compile and install Apr software while compiling httpd-2.4.7.MV apr-1.5.1 HTTPD-2.4.27/SRCLIB/APRMV apr-util-1.5.4 Httpd-2.4.27/srclib/apr-utilCD httpd-2.4.27./configure--prefix=/usr/local/apache2--sysconf

Seventh Lesson Process Communication

, failed to return-1.E. The kernel adds 1 to the load count of the shared memory.3) Offload shared memoryint SHMDT (const void* SHMADDR);A. From the address space of the calling process,Cancels the shared memory-mapped area that is pointed to by the SHMADDR parameter.B. Successful return 0, failure return-1.C. The kernel will reduce the load count of this shared memory by 1.4) Destroy/control shared memoryint shmctl (int shmid, int cmd, struct shmid_ds* buf);struct Shmid_ds {struct Ipc_perm shm_

Manually compile and install Apache

(unpacked folder)/OPT/HTTPD-2.4.2/SRCLIB/APRCp-r? Apr-util (unzipped folder)/opt/httpd-2.4.2/srclib/apr-util Five, source code compiled to install Apache.Enter under [[email protected] httpd-2.4.2]# ./configure \--prefix=/usr/local/apache \--ENABLE-SO \--enable-rewrite \--enable-mods-shared=most \--with-mpm=worker \--disable-cgid \--disable-cgi The above parameters are explained:--prefix=?? To specify the installation path--enable-so? This paramete

Detailed Apache configuration image anti-theft chain and hidden version information

/LOCAL/HTTPD \--WITH-APR=/USR/LOCAL/APR \--with-pcre=/usr/local/pcre \--enable-deflate \--ENABLE-SO \--enable-rewrite \--enable-charset-lite \--enable-cgi parameter resolution: Prefix: Specifying the installation directoryEnable-deflate: Enable Mod_deflate moduleENABLE-SO: Enable dynamic load module support, what functions are required to dynamically loadEnable-rewrite: Enable Web address rewriting to implement pseudo-staticEnable-charset-lite: Default Character SetEnable-

Build three components of the WEB server and install apache2 + php5 + mysql5

apr-util-1.2.8.tar.gz# Cd apr-util-1.2.8#./Configure -- prefix =/data/apps/apr-util-httpd/> -- With-apr =/data/apps/apr-httpd# Make# Make install3. # Configure httpd # Tar jxvf httpd-2.2.4.tar.gz# Cd httpd-2.2.4# Vi config. sh:Code: #! /Bin/bashHTTPD_ROOT = "/data/apps/apache2" ./Configure -- prefix = $ HTTPD_ROOT/-- With-apr =/data/apps/apr-httpd/-- With-apr-util =/data/apps/apr-util-httpd/-- Enable-so/-- Enable-rewrite/-- Enable-info/-- Enable-cgid

Adjustment of IPC resources, kernel. shmmax, and Oracle shared memory

(I) view and release IPC Resources [Root @ David ~] # IPCS-M ------ shared memory segments -------- key shmid owner perms bytes nattch status ...... 0xbe3bb918 5439503 Oracle 640 419438592 22 [root @ David ~] # IPCS-m-I 5439503 shared memory segment shmid = 5439503uid = 501 gid = 502 cuid = 501 cgid = 502 mode = 0640 access_perms = 0640 bytes = 419438592 LPID = 5335 CPID = 5283 nattch = 21att_time = Sat Jun 29 18:50:06 2013 det_time = Sat Jun 29 18:5

Build a lamp platform

PHP connection MySQL[email protected] mysql]# Yum install Php-mysqlCMS: (Open source)DrupalJoomlaCompile and install lamp httpdInstallation Order: httpd-->mysql-->phpVersion:httpd:2.4.12mysql:5.6.10php:5.4.42Apr:apache Portable Runtime, is the httpd virtual machineApr-utilApr-iconvCompile and install the HTTPD software:#yum-yinstallpcre-devel #HTTPD的编译环境 #tarxf apr-1.4.6.tar.bz2 #httpd虚拟机apr软件安装 #cdapr-1.4.6#./configure-- prefix=/usr/local/apr#make#makeinstall#tarxfapr-util-1.4.1.tar.bz2 #apr i

Previous Code series-Ajax and JSON drop-down list box

();}} /// /// Obtain the grade data string /// /// [{ID: 1, name: "eyes" },{}] Public String Getgradedatastring () {stringbuilder sbstr = New Stringbuilder ( " [ " ); Foreach (Model. Grades Model In Listgrades) {sbstr. append ( " {ID: " ); Sbstr. append (model. GID); sbstr. append ( " , Name :\" " ); Sbstr. append (model. gname); sbstr. append ( " \"}, " );} Return Sbstr. tostring (). substring ( 0 , Sbstr. Length- 1 ) + " ] " ;} /

Apache static Compilation and dynamic compilation detailed

--enable-http HTTP protocol Handling-- Disable-mime mapping of File-extension to MIME--enable-dav WebDAV protocol handling--disable-statu s process/thread Monitoring--disable-autoindex directory listing--disable-asis as-is filetypes-- Enable-info Server information--enable-suexec set UID and GID for spawned processes--disable-cgid CGI scripts--enable-cgi CGI scripts--disable-cgi CGI scripts--enable-cgid

MySQL database and sqlserver pressure monitoring program practices

: 40", "15: 50 ", "16: 10", "16: 20", "16: 30", "16: 40", "16: 50 ", "10 10", "17:20", "17:30", "17:40", "17:50 ", ", "19:10", "19:20", "19:30", "19:40", "19:50 "}; System. Random r = new Random (); Int myyl = r. Next (1120,189 0 ); String SQL = "insert into yl (sendtime, sendvalue, cgID) values ('" + times [I]. toString () + "'," + myyl + ", 11 )"; // System. Web. HttpContext. Current. Response. Write (SQL ); Con. Open (); Cmd. Co

Apache Web server

-1.5.4.tar.gz#cd apr-util-1.5.4/#./configure--prefix=/usr/local/apr-util--WITH-APR=/USR/LOCAL/APR#make make Install#tar ZXF lib-1.2.8.tar.gz#cd zlib-1.2.8/#./configure--prefix=/usr/local/zlib#make make Install#tar ZXF pcre-8.39.tar.gz#cd pcre-8.39/#./configure--prefix=/usr/local/pcre#make make InstallDownload Openssl,centos7 from version openssl-1.0.1e#wget https://www.openssl.org/source/openssl-1.0.1u.tar.gz#tar ZXF openssl-1.0.1u.tar.gz#cd openssl-1.0.1u#./config-fpic--prefix=/usr/local/ope

UNIX interprocess Communication (IPC) concept (Posix,system V IPC)

the key value of 0 as Ipc_private).ipc_perm StructureIn the System V IPC, the kernel maintains an IPC information structure, just like the file information structure: (Note that this structure is somewhat different from the book)structipc_perm{__key_t __key; /*Key. */__uid_t uid; /*Owner ' s user ID. */__gid_t GID; /*Owner ' s group ID. */__uid_t cuid; /*Creator ' s user ID. */__gid_t Cgid; /*Creator ' s group ID. */unsigned Short intMode/*read/write

Apache manually compiled installation (with package included)

/opt4. Copy the unpacked package to/opt/httpd-2.4.2/srclib and change the name to Apr and Apr-util respectively.# cp -R apr-1.4.6/ httpd-2.4.2/srclib/apr# cp -R apr-util-1.4.1/ httpd-2.4.2/srclib/apr-util5.yum Installation Related Environment pack# yum install gcc gcc-c++ make perl pcre-devel expat-devel libxml2-devel -y6. Configure the Software modulecd /opt/httpd-2.4.2./configure --prefix=/usr/local/apache --enable-so --enable-rewrite --enable-mods-shared=most --with-mpm=worker --disable-

Compile and install httpd Apache server

/apache--sysconfdir =/ETC/HTTPD--enable-so--enable-rewirte--enable-ssl--enable-cgi--enable-cgid--enable-modules=most-- Enable-mods-shared=most--enable-mpms-shared=allProblem 1:checking for Pcre-config ... falseSolution: Yum-y Install Pcre-develIssue 2:checking for OpenSSL version >= 0.9.8a ... FAILEDSolution: Yum Install Openssl-develMakeQuestion 3:make[2]: Bison: Command not found MAKE[2]: Flex: Command not FoundFIX: Yum-y Install Bison FlexQuestion

Apache Build virtual Host (based on IP, port, domain name implementation) enclosing the source package

.tar.gz-c/usr/src #支持正则[Email protected] ~]# cd/usr/src/pcre-8.10/[Email protected] pcre-8.10]#/configure prefix=/usr/local/pcre make make instal2. Configuring and installing Apache[Email protected] ~]# tar xvfz httpd-2.4.2.tar.gz-c/usr/src/[Email protected] ~]# cd/usr/src/httpd-2.4.2/[Email protected] httpd-2.4.2]#/configure \--PREFIX=/USR/LOCAL/HTTPD \--WITH-APR=/USR/LOCAL/APR \--with-pcre=/usr/local/pcre \--ENABLE-SO \--enable-rewrite \--enable-mods-shared=most \--with-mpm=worker \--disable

Source code manually compiled lamp architecture Discuz Forum (containing source package)

/httpd-2.4.2/[Email protected] httpd-2.4.2]#/configure \--PREFIX=/USR/LOCAL/HTTPD \--WITH-APR=/USR/LOCAL/APR \--with-pcre=/usr/local/pcre \--ENABLE-SO \--enable-rewrite \--enable-mods-shared=most \--with-mpm=worker \--disable-cgid \--disable-cgi parameter resolution: Prefix: Specifying the installation directoryinstallation directory for WITH-APR:APRWith-pcre: Using the extended pcre regular expression LibraryENABLE-SO: Enable dynamic load

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