FILE SIGNATURES TABLE 16 December 2017 This table of file signatures (aka "magic numbers") is a continuing work-in-progress. I had found little information on this in a single place, with the exception of the table in Forensic Computing: A Pract…
java.sql.SQLException: Incorrect key file for table 'C:\Windows\TEMP\#sql578_6e2_68d.MYI'; try to repair it 在查询大量数据的时候出现这个问题,原因是mysql会在temp下面创建一个临时文件,报错提示是没法创建, 第一想到就是看下c盘temp 目录,网上说是内存不足导致的,看了c盘内存还很大,因为用了读写分离,然后想到是不是从库的服务器硬盘问题,经过盘查果然是,其中一个从数据库的c盘内存满…
Malware Analysis Tutorial 8: PE Header and Export Table 2. Background Information of PE HeaderAny binary executable file (no matter on Unix or Windows) has to include a header to describe its structure: e.g., the base address of its code section, dat…
Chapter 4. The class File Format Table of Contents 4.1. The ClassFile Structure 4.2. Names 4.2.1. Binary Class and Interface Names 4.2.2. Unqualified Names 4.2.3. Module and Package Names 4.3. Descriptors 4.3.1. Grammar Notation 4.3.2. Field Descript…
The Portable Executable File Format from Top to Bottom Randy KathMicrosoft Developer Network Technology Group Created: June 12, 1993 Click to open or copy the files in the EXEVIEW sample application for this technical article. Click to open or copy t…
Analyze Table MySQL 的Optimizer(优化元件)在优化SQL语句时,首先需要收集一些相关信息,其中就包括表的cardinality(可以翻译为“散列程度”),它表示某个索引对应的列包含多少个不同的值——如果cardinality大大少于数据的实际散列程度,那么索引就基本失效了.我们可以使用SHOW INDEX语句来查看索引的散列程度: SHOW INDEX FROM PLAYERS; TABLE KEY_NAME COLUMN_NAME CARDINALITY----…
14.8.2 Verifying File Format Compatibility 校验文件格式兼容性: 14.8.2.1 Compatibility Check When InnoDB Is Started 14.8.2.2 Compatibility Check When a Table Is Opened InnoDB 包含几个检查来防范可能的crashes 和数据腐败 如果你运行一个老版本的MySQL 服务器 在 InnoDB 数据文件 使用一个新的文件格式. 那些检查发生当serve…
部分生产环境采用mysqldump --single-transaction的方式在夜间进行数据库备份,而同事恰好在备份期间执行了alter table操作,操作部分成功部分失败,为啥呢? 在mysqldump对single-transaction参数的解释为: Creates a consistent snapshot by dumping all tables in asingle transaction. Works ONLY for tables stored instorage eng…