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Visibility and hiding of Oracle Indexes)

the partition index invisible. An error occurs when you try to do so. Test: 1. Create a test table ti based on the dba_objects table. Scott @ ORCL> create table ti as select * from dba_objects; Table created. Scott @ ORCL> select count (*) from ti; COUNT (*) ---------- 72799 2. Create an index ind_ti Based on the object_id Column Scott @ ORCL> create index ind_t

Database-concurrency control

When multiple transactions are concurrently executed in the database, data consistency may be damaged. It is necessary for the system to control the interaction between transactions, which is achieved through one of multiple mechanisms of the concurrency control mechanism. To prevent the transaction from getting starved to death, authorize the lock condition: there is no other transaction holding the lock that conflicts with the m lock on the data item Q; there is no transaction waiting to loc

Basic steps of Bayesian spam filtering algorithm

| Ti) indicates the probability that the email will be spam when the token string Ti appears in the email.SetP1 (Ti) = (the value of Ti in hashtable_good)P2 (Ti) = (the value of Ti in hashtable _ bad)P (A |

How to install TrueImageforLinux

How to install TrueImageforLinux-Linux Enterprise Application-Linux server application information. 1) make sure the latest version is installed. The trial version is 9.1 build3854 and the official version is 3883. 2) according to different linux versions, there are precautions for HOWTO. INSTALL, such as Mandrake, fedora, debian, and redhat. 3) The system requires an acronis operation called snapapi, while acro

Solution to dual-system dual hard drive installation in Windows 7

I installed the dual-System "fedora 18" on the win7 hard drive according to the network method and found many problems. I have solved the problem based on my practical experience and provided my own solutions. You are welcome to make a decision. First of all, read the content: I only use Linux environment without easybcd. Solution: Do not use easybcd to complete the hard disk installation of Fedora 18/centos 6 First, review the method on the Network: (the content is similar) Software Used in th

Teach you how to resize a c drive (original)

Recently, I encountered a problem that the computer in the machine room had a hard drive C with a hard drive of only 20 GB. Now many programming tools are installed to occupy part of the C disk space, and 20 GB of space will soon be used up, however, other partitions do not have much space. I have installed a lot of software on my computer and a lot of data. I don't want to reload the system, format the hard disk, and partition again. I found a lot of articles on the Internet but did not have a

Free XP/Vista lossless partitioning software easeus partition master

If you buy a new computer with only one partition, or when we find that the previous partition cannot meet your needs, what we need most is a lossless partition software that supports systems such as XP and Vista. The world of heterogeneous software has introduced acronis disk ctor suite, which can meet almost all of our partition needs. Unfortunately, it is a commercial software with a high price. It is not a perfect choice for copyright owners. Toda

Increase the remaining space of the system disk without reinstalling the XP System

A while ago, I installed a lot of software, such as vs2008 and msdn. Although I set the target directory to a non-system disk every time I install software, as the number of software increases, my system disk was quickly eroded (only about 1 GB space is left ). Is there a lot of software to be installed? The stream of ArcGIS, Oracle, and ERDAS is quite huge... To solve the problem of "adding the remaining space of the system disk without reinstalling the XP system", you can use

C + + implementation MD5 algorithm implementation code _c language

UInt64 Totalinputbits_;Uchar8 md5result_[16]; Bit style MD5 result,totally 128 bitChar md5result_hex_[33]; hexadecimal style result; Md5result_hex_[32]= ' "BOOL Isdone_; Indicate the Comput is finished;Inline UInt32 rotateleft (const uint32 x, int n);Inline UInt32 F (const uint32 x, const uint32 y, const uint32 z);Inline UInt32 G (const uint32 x, const uint32 y, const uint32 z);Inline UInt32 H (const uint32 x, const uint32 y, const uint32 z);Inline UInt32 I (const uint32 x, const uint32 y, cons

10 articles about phprmdir () functions are recommended.

returns to delete the empty directory. If there are subdirectories in the directory and the directory is not empty, you need to use recursive methods. The source code for deleting a Directory using a custom recursive function is as follows: 1. php rmdir use recursive functions to delete non-empty directory instances Introduction: php, directory: Directory of PHP: Directory operation create directory mkdir (path, permission, recursive creation) delete directory rmdir () move (rename) rename ()

Worry-free expansion of virtual machine disks

When it comes to disk conversion and disk expansion for virtual machines It's been a headache for IT ., There's a way for VMware to be official. ,we tried to follow the steps again,It's not the average person who can handle it. , not to mention Hyper-V, Citrix,KVM, deeply convincing, Huawei has not yet provided an effective method, and there are risks ., Imagine that VMs in an enterprise's production environment need to be scaled up,do you dare?? It 's good to find this method in a single atte

Solution to the problem that Windows 7 system disks cannot be displayed

Acronis disk ctor suite is currently the only lossless partition software that perfectly supports 7 windows. We are familiar with partitionmagic and cannot read the special 3 + 1 partition method of win7, which cannot be used. However, win7's disk management software has many limitations and cannot fully utilize the allocable space. Therefore, it is not recommended. It is compatible with various partition formats, including the special partition forma

Windows 7 Hard Drive installation CentOS 6.0

This is the first time to install the system, it is now very familiar, but still put it, forget to spare. http://ftcl.hit.edu.cn/main/?p=854 1 Related Backgrounds No CentOS 6.0 system CD, there is a U disk but do not want to use it to make Linux startup disk, the reason is great damage to u disk, how to do it. Or the hard drive installation bar. From hit FTP (ftp://run.hit.edu.cn) downloaded from the Centos-6.0-i386-bin-dvd.iso, there are 4.4GB. Because the FAT32 file system supports a sin

String Matching: simple match & amp; KMP Algorithm

algorithm is designed by Knuth, Morris, and Pratt. Therefore, it is named KMP.Improvements to KMP Looking back at the simple matching algorithm mentioned above, it is always I ++; j = 0 in each case of mismatching. from the screen, it is to move the pattern string to the backward position of the Main string, start a new round of comparison from the first character of the mode string. In mathematics, This is the geometric meaning of I ++; j = 0. In case of mismatch, the subscript of the primary

Introduction to bayesian Algorithms

TOKEN string and the word frequency. 4. Calculate the probability that a TOKEN string appears in each hash table P = (Word Frequency of a TOKEN string)/(corresponding to the length of the hash table) 5. Considering Both hashtable_good and hashtable_bad, It is inferred that a TOKEN string appears in a new mail, and the new mail is likely to be spam. The mathematical expression is: A event-the email is spam; T1, t2 ....... Tn indicates the TOKEN string P (A |

Introduction to NuttX

Cortex-M4) STMicro STM32 F429 (STM32 F4 family, ARM Cortex-M4) 3.11 Texas Instruments (some formerly Luminary) TI TMS320-C5471 (ARM7TDMI) TI Calypso (ARM7TDMI) TI TMS320-DM320 (ARM9E6JS) TI/Stellaris LM3S6432 (ARM Cortex-M3) TI/Stellaris LM3S6432S2E (ARM Cortex-M3)

Core anti-spam Firewall Technology Analysis

token string and the word frequency.4) calculate the probability that a token string appears in each hash table P = (Word Frequency of a token string)/(corresponding to the length of the hash table)5) Considering Both hashtable_good and hashtable_bad, It is inferred that a token string appears in the new mail, and the new mail is likely to be spam. The mathematical expression is:A event-the email is spam;T1, T2 ....... TN indicates the token string. P (A |

MCU Interrupt System

(this is where the program was written. If the interrupt program was not put there, it would be wrong, the interrupted program cannot be executed ). 3. Execute the interrupt processing program. 4. Interrupt return: After the interrupt command is executed, it is returned to the main program and continues to be executed. How does a single-chip microcomputer locate the interrupt program and return it? Let's talk about it later. The structure of MCS-51 Single Chip Microcomputer Interrupt System:The

MCU Interrupt System

(this is where the program was written. If the interrupt program was not put there, it would be wrong, the interrupted program cannot be executed ). 3. Execute the interrupt processing program. 4. Interrupt return: After the interrupt command is executed, it is returned to the main program and continues to be executed. How does a single-chip microcomputer locate the interrupt program and return it? Let's talk about it later. The structure of MCS-51 Single Chip Microcomputer Interrupt System:The

Anti-spam Technology analysis

string in each hash table (frequency of a token string)/(corresponding to the length of the Hashtable) p= 5. Consider Hashtable_good and Hashtable_bad, and infer the probability that the new message will be spam when a token string appears in the new message. The mathematical expression is: A event----a spam message; T1,t2 ... tn stands for TOKEN string. P (a|ti) indicates the probability of a spam message when TOKEN string

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