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Cause: in an online business, we use the older CodeIgniter framework. In the DB class, there is a design defect in the processing of DB transactions, maybe it's not a defect. However, it affects our production environment and leads to a chain

We all know that group by can be used to group clauses, extended GROUP BY PLUS rollup clause, can return a small Ji Lu for each group, and return total records for all groups, as follows: Gyj@ocm> with T as 2 (select ' A ' comp, ' x ' Cate, '

This article mainly introduces the recursive neural network implemented by Python, is an excerpt from the GitHub code snippets, involving Python recursion and mathematical operations related to operational skills, the need for friends can refer to

This article mainly introduces the design defects and solutions for CodeIgniter framework database transaction processing. It can also be said that it is a small BUG. friends who use CodeIgniter transactions will encounter this problem, for more

In the actual project encountered a ORA-00257 error (insufficient space error), by looking for information, the vast majority of said this is due to archiving too many logs, taking up all the hard disk space to export In the actual project

Today, on a whim, we want to implement a traditional convolution algorithm that does not adopt various acceleration methods, but only optimizes the pure version of the algorithm logic.After writing the discovery performance can also, special sent to

Recently, I have made some analysis on the implementation of Tetris in open-source QT, And I will record it by the way. This document complies with gnu gpl.   I always wanted to make my own games. Tetris or wuziqi should be examples that beginners

// Maze problem --- Search for breadth first ----- queue # include # include #include using namespace STD; # define max_row 5 # define max_col 5 struct point {int row; int Col ;}; queue S; int maze [max_row] [max_col] = {, 0, 0, 0, 0, 0, 0, 0, 0, 0

Directory 1 memory Address Type 2 "Memory-segment management" on hardware 2.1 Segment selector and segment registers 2.2 Segment Descriptor (Segment descritor) Quick access to 2.3 segment descriptors 2.4

Cause: In one of our lines of business, using the older version of the CodeIgniter framework, which has a design flaw in the DB class, is probably not a flaw. But he has affected our production environment, resulting in a chain reaction. has a

Overview： Oracle database is currently the industry's most commonly used large database systems, I encountered in the actual project ORA-00257 error (lack of space error), by looking for information, most of this is due to the archive log too much,

Modulo 2 is a binary algorithm, the core ofCRC calibration technology, so before we analyze the CRC algorithm, we must grasp the rules of modulo 2 operation. In the same way as arithmetic, modulo 2 also includes modulo 2 plus, modulo 2 minus, modulo

How to read the results of the key value in redis now there is a key in redis, the key name is wz_user I read wz_user $ Redis-> hGetAll ("wz_user "); Value: ??? Array ([1170202] => a: 52: {s: 2: "id"; s: 7: "1170202"; s: 3: "pid"; s: 1: "0"; s: 8

Document directory Oracle listener Oracle management agent In Linux, you can run the ps command to view Oracle-related processes.Oracle listener This command will list the processes of Oracle Net Listener [Oracle @ bej301441 ~] $ PS-Ef |

Group_Concat function example bitsCN.com 1. function definition: GROUP_CONCAT([DISTINCT] expr [,expr ...] [ORDER BY {unsigned_integer | col_name | expr} [ASC | DESC] [,col_name ...]] [SEPARATOR str_val]) 2.

Now there's a key,key in Redis named Wz_user. I read Wz_user $redis->hgetall ("Wz_user"); The value appears: ??? Array ([1170202] = a:52:{s:2: "id"; s:7: "1170202"; s:3: "pid"; s:1: "0"; s:8: "User"; s:11: "13520966111"; s:8: "Password "; s:32:"

Dummyvars function: Dummyvars creates a full set of the dummy variables (i.e. less than-rank parameterization----Set up a complete set of virtual variablesLet's give you a simple example:Survey"very unhappy","Unhappy","Neutral","Happy","very Happy"))

Recently, I encountered an ultra-poor SQL statement. The table name is processed because the SQL statement involves data from a certain tax bureau. The original SQL statement is as follows: Select * from (select T. zxid, T. GH, T. XM, T. BM, T.

Author :? SHOUG Member-Luo Min, ORACLEACS Senior Consultant, asked questions and demands: "Does your Oracle company have such an automatic SQL statement scanning tool? Using this tool, we can import our application software to eliminate most of the

Declaration: Version 11gR2, CentOS5.81 physical structure (File) main performance impact on IO (1) controlfileselect * fromv $ controlfile (2) datafileselect * fromdba_data_files (3) redo? (Onlinelogfile) select * fromv $ logfileselect * fromv $ log