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  •  Reverse writeup of "jiaweisi Cup" in Shanghai in 2019

    Reverse writeup of "jiaweisi Cup" in Shanghai in 2019

    ###Obfuse 32-bit ELF file, shell free, find key code through key string during loading! [] () However, if you find that F5 is not easy to use, you can only look at the assembly. First, output "password:" and then read a string of strings from the cache and enter the sub\_ 8048580 to verify, if return
  •  Oceanbase subquery

    Oceanbase subquery

    In data, subquery can be divided into dependent subquery and non dependent subquery. A dependent subquery means that the execution of the subquery depends on the 'variables' of the external query, so the subquery is usually evaluated multiple times. A subquery without dependency means that the execution of the subquery does not depend on the 'variable' of the external query
  •  Oceanbase distributed polymerization and depressurization

    Oceanbase distributed polymerization and depressurization

    Aggregation operators in the database, such as sum, AVG, group by, sort, and so on, will consume a lot of CPU and IO resources for calculation, reading and writing. Through parallel execution, the corresponding operators are pressed down to each computing node, making full use of the computing resources of the cluster and improving the execution efficiency. On the whole, it's a good idea
  •  2018chinajoy

    2018chinajoy

    I don't have much interest. I went to see my sister all over the place. What's more, I saw the founder of the devil way   By the way, there are also @ intoxicated with the Chinese wind, the strength of the big man endorsement of the adverse water cold    
  •  General grammar 2

    General grammar 2

    Constant int_ Value: matches an integer type constant, such as 123. DECIMAL_ Value: matches fixed-point type constants, such as 123.456. STR_ Value: matches a string constant, such as ABC. Null: matches a null constant. STORAGE_ Size: match memory