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Root Search algorithm Principle: Set up several kinds of root objects, when any one of the root object to an object is unreachable, it is considered that this object can be recycled. A reference that is typically held by an object pointing to the object is unreachable 　　 In the Java language, there are several objects that can be roots as GC: 1. The referenced object in the virtual machine stack.2. The object referenced by the class static property in the method area

-----------------------------------------------recycletest TABLE Look! The table recovered without difficulty. If you look at the Recycle Bin now, it will be empty. Remember, putting a table in the Recycle Bin does not free up space in the original tablespace. To free up space, you need to empty the Recycle Bin with the following command: PURGE RecycleBin; But what if you want to completely delete the table without using the Flashback feature?

homologous code package or precompiled package may be different, and then recommend the use of ls-f--color or LS-F command (in fact, I only need the L command) to view the executable file, The executable file will be marked with the trailing sign of the * number.Generally executed in turn./configureMakesudo make installTo complete the installation.Second, the uninstall method of software package in Ubuntu1. Apt mode(1) Remove type unloading: Apt-get remove softname1 softname2 ...; (Remove the p

file name is specified, Mysql uses the hostname-binfile. > If a relative path is specified, it is assumed that the path is relative to the data directory. > Mysql adds a digital index after the file name. Therefore, the final form of the file is filename. number. If you provide the extension (for example,-log Bin = file_name.extension), the extension is removed and ignored. Change Policy: Use indexes to loop files. The following conditions will be used to loop to the next index. 1. Server resta

Debian APT and DPKG details-Linux Release Technology-Debian information. The following is a detailed description. I. Use of APT (Ubuntu Linux package management tool I) Apt-cache search # ------ (package search package) Apt-cache show # ------ (package obtains package information, such as description, size, and Version) Sudo apt-get install # ------ (package installation package) Sudo apt-get install # ----- (package--reinstall re-installation package) Sudo apt-get-f install # ----- (Force insta

is as follows:Apt-CDROM ident scan information of the discApt-CDROM Add add a CD Source(2) The most common method is to add the source to/etc/APT/source. list, and then update the apt-Get Update column. Common commands of APT management toolsApt-Cache can be used with different sub-commands and parameters to find and display software, package information, and package trust relationships.Apt-Cache stats displays statistics of all the debain data sources used by the current system.Apt-cache searc

Remove softname1 softname2 ...;(also clear the configuration)Clear uninstall: Apt-get purge sofname1 softname2 ...;(ditto, also clear config file)2, Dpkg Way(1) Remove type unloading: dpkg-r pkg1 pkg2 ...;(2) Clear type unloading: dpkg-p pkg1 pkg2 ...;Third, the query method of software package in UbuntuDpkg uses a text file as a database. Commonly known in the /var/lib/dpkg directory. The generic term stores the state of the software, and control in

performance, using Dynamic line format5, less use SELECT * Text, blob6, InnoDB table best Use self-increment type column master key7, Innodb_flush_log_at_trx_commit0, redo log buffer is not written to disk when transaction commits1, redo log buffer is written to disk when transaction commits2, only redo log buffer is written to the operating system cache when the transaction commitsIt is generally recommended to set to 1 and set sync_binlog=1 to ensure data reliability8, Innodb_log_file_size ib

file storage directory (/var/vcache):[Email Protected]]#/usr/sbin/groupadd www[Email protected]]#/usr/sbin/useradd-g www www[[email protected]] #mkdir-P/usr/local/varnish/var/varnish/[[email protected]] #chmod +w/usr/local/varnish/var/varnish/[[email protected]] #chown-R www:www/usr/local/varnish/var/varnish/3. Create the Varnish log directory (/usr/local/varnish/logs):[[email protected]] #mkdir-P/usr/local/varnish/logs[[email protected]] #chmod +w/usr/local/varnish/logs[[email protected]] #cho

Tags: detail any pen ble round database Replicat set ACKTransferred from: http://blog.csdn.net/atco/article/details/24259333 DescriptionWhen you turn on MySQL database master and slave, there will be a lot of files such as mysql-bin.00000* log, which will consume your hard disk space.mysql-bin.000001mysql-bin.000002mysql-bin.000003mysql-bin.000004mysql-bin.000005...There are three solutions: 1. Turn off MySQL master and slave, turn off binlog;2. Turn on MySQL master and slave, set expire_logs_da

I used to configure the service environment for testing on the server. I was too lazy to install it using an online ready-made script. As a result, MySQL cannot be started, so I only had to honestly reinstall MySQLServer, I thought that commands like apt-get -- purge could help me solve this problem, so I re-installed sudoapt-get -- p through the following command: I used to configure the service environment for testing on the Server. I was too lazy t

associated objects (including indexes and constraints) of the table are deleted, trigger, LOB segment, and LOB index segment) will not be physically deleted. These objects are first transferred to the recycle bin, which provides users with a possibility of recovery.The recyclebin initialization parameter is used to control whether to enable the recyclebin function. The default value is ON and can be disabled with OFF.SQL> show parameter recycleRecyclebin string onDisable this function:SQL> alte

variable is set to 1. These two variables affect the AUTO_INCREMENT column method: auto_increment_increment controls the increment value of values in the column, auto_increment_offset determines the starting point of values in the AUTO_INCREMENT column. If the value of auto_increment_offset is greater than that of auto_increment_increment, the value of auto_increment_offset is ignored. For example, if some data already exists in the table, the existing maximum auto-increment value is used as th

86400 1 minute resolution data purge interval. Default is 1 day. Timeline.metrics.host.aggregator.minute.ttl 604800 Host based X minutes resolution data purge interval. Default is 7 days. (X = configurable interval, default interval is 2 minutes) Timeline.metrics.host.aggregator.hourly.ttl 2592000 Host based hourly resolution data

From: http://my.oschina.net/u/947673/blog/277224 # Solution This is because your boot partition is a separate partition. For example, I only gave 100 m, which was not installed in Ubuntu before. So when this prompt appears, I am very puzzled, the answer is found. Why is the boot partition full? It mainly stores some old Linux image files. So, Run the following command to view the Linux images in the boot partition: Dpkg-L | grep Linux-Image We found linux-image-3.13.0-24-generic, linux-image-3

placed in the recycle bin cannot be deleted using the drop command (note the double quotation marks on the object name ):SQL> drop table "bin $ v3f/oyuitrcef2cots5jaa = $0 ";Drop table "bin $ v3f/oyuitrcef2cots5jaa = $0"*Error at line 1:ORA-38301: can not perform. DDL/DML over objects in Recycle BinTo clear this object, run the purge command:SQL> purge table "bin $ v3f/oyuitrcef2cots5jaa = $0 ";Table purge

1. commands for uninstalling apache2Sudo apt-Get -- purge remove apache2Sudo apt-Get -- purge remove apache2.2-commonOr directly use a commandSudo apt-Get autoremove apache2 (this method cannot be completely uninstalled) 2. uninstall MySQLSudo aptitude purge mysql-server mysql-server-5.0 3. Uninstall PhP5Sudo apt-Get autoremove PhP5 4. Batch Delete components

$ 3ompfwhfr6q1ccyegxwbvg ==$ 0 table2008-05-17: 09: 42: 54 ----------------------- Flash restore SQL> flashback table myemp to before drop 2/ Flash back complete. SQL> select empno, ename, job, Sal deptno from myemp where deptno = 20 2/ 3 4Empno enameJobDeptno 5--------------------------------------- 67369 SmithClerk800 77566 JonesManager2975 87788 ScottAnalyst3000 97876 AdamsClerk1100 107902 FordAnalyst3000 Note: You can use "

From: http://www.windsfly.cn/blog/article.asp? Id = 2381 1. commands for uninstalling apache2 Sudo apt-Get -- purge remove apache2Sudo apt-Get -- purge remove apache2.2-common Or directly use a commandSudo apt-Get autoremove apache2 2. uninstall MySQLSudo aptitude purge mysql-server mysql-server-5.0 3. Uninstall PhP5Sudo apt-Get autoremove PhP5 4. Batch D

, and will not be placed in the recycle bin.If the recycle bin function is enabled after an object is dropped. it is not actually deleted. In fact, we only modified the name. We can still find it using select * from user_objects where type = 'table. its name is a bit strange. for example, BIN $ qAUuckGyd3TgQKjAFAFTAg ==$ 0 The recyclebin parameter is used to control whether to enable the recyclebin function. The default value is ON and can be disabled with OFF. SQL> show parameter recyclebinNAME