total space

For frequent index update, the delete operation produces index Frag, which affects index efficiency and increases index IO. 1. Index fragmentation analysisTest Index fragmentation:SCOTT @ devcedb> select count (*) from obj;COUNT

Php disk_free_space function and disk_total_space function tutorial, the first function refers to the space returned by the function, in bytes, in the specified directory, and the total space returned by the disk_total_space Function Definition and

This article has been published by the author Yao piaohai to authorize the Netease cloud community. Welcome to the Netease cloud community to learn more about the operation experience of Netease technology products. Overview In daily program

This article has been published by the author Yao piaohai to authorize the Netease cloud community. Welcome to the Netease cloud community to learn more about the operation experience of Netease technology products. Overview In daily program

Http://cache.baiducontent.com/C? M = queue & P = c665c54ad6c24ac30be29f28174f82 & newp = queue & User = Baidu & fm = SC & query = storage + space + running + out & qid = & p1 = 1 In the process of being responsible for the file system module,

Private void button#click (Object sender, eventargs E){String strrecordfilepath = "D:/dasda ";String STR = strrecordfilepath. substring (0, 1). toupper (); // use the first letter and convert it to uppercase.This. m_chkdisk (STR );} // Strdisk

Http://blog.sina.com.cn/s/blog_5c717fa001012ml7.html Http://baike.baidu.com/view/1078660.htm Sizeof function: calculate the number of bytes in the Data Space 1. Comparison with strlen ()Strlen calculates the number of characters in the character

"Algorithm One"Violence.Can pass the No. 0,1 test point. Estimated score: a score of. "Algorithm Two"Classic question: Interval number, data range is not very large, so we can:① block, discretization, preprocessing: The number of x occurrences in

1. Preface memory allocation and recovery policy Structure analysis of JVM heap (new generation, old age, permanent generation) Object Precedence in Eden Assignment Large objects go straight into the old age

I. Temporary table space contraction 1.1 Description About Oracle's temporary tablespace, a blog has been collated before: Oracle Temp temporary table space http://blog.csdn.net/tianlesoftware/article/details/4697417 The following operations can

The TOPAS command can monitor system activity ――memory,i/o,paging space,cpu,process. This command is included in the Perfagent.tools file set. How to use the command: Topas [D-Number_of_monitored_hot_disks] [-h] [I.

Task Name: Schema Elon Data migration to schema TIAN in the production environment########################################Pre-Preparation:1: Confirm the object status under the Elon userSelect

4 ) format;View kernel information650) this.width=650; "src=" http://img1.51cto.com/attachment/201410/24/2664956_14141408459xIL.png "border=" 0 "/>To format a partition is to create a file system: Rhel5:ext3Rhel6:ext4Mkfs-t Ext4 = MKFS.EXT4 =

BackgroundThe knowledge and experience is the key foundation for a system to locate the problem, the data (run log, exception stack, GC log, thread snapshot [Threaddump/javacore file], heap dump snapshot [heapdump/hprof]) is the basis, the tool is

When we give a system a problem, the knowledge and experience are the key foundation, the data is the basis, the tool is the means of using the knowledge to process the data. The data here include: Run log, exception stack, GC log, thread snapshot

1. Java Garbage Management mechanism Object dead Judgment Method: 1 Reference counting method, 2 accessibility analysis algorithm (roots by GC to whether the class is reachable) Reference: Strong references: Common in code, generating objects with

Introduction to the Database engine The MySQL database engine depends on how MySQL was compiled at the time of installation. To add a new engine, you must recompile MySQL. By default, MySQL supports three engines: ISAM, MyISAM, and heap. The other

JPS Viewing the currently running Java process The JVM process Status Tool displays all the hotspot virtual machine processes within the specified system. The JPS-LVM is used to view the Java processes running on the current machine.command format

The MySQL database engine depends on how MySQL was compiled when it was installed. To add a new engine, you must recompile MySQL. By default, MySQL supports three engines: ISAM, MyISAM, and heap. Two other types of InnoDB and Berkley (BDB) are also

Querying MySQL table size and index size can be achieved through the tables table in the system library INFORMATION_SCHEMA.Some of the fields used in this table are:Table_schema: Database nameTABLE_NAME: Table nameEngine: the storage engine