continuous redial

dedicated to emulator instance connection, Then the data can be forwarded from emulator to the IDE console, and the other is 5555, specifically with ADB daemon connection for back debugging use 14. ADB Shell PS after executing adb shell PS USER PID PPID vsize RSS wchan PC NAME fu0_a349 31658 481 2405608 180692 FFFFFFFF 00000000 S User: The current users of the process; PID: no doubt, the abbreviation for process ID, also on the progress number; Ppid:process Parent ID, parent process ID vsize:vi

1. The sampling frequency has a greater effect on the frequency spectrum of the DFT analysis signal because it directly affects the degree of spectral aliasing. The sampling frequency must be greater than twice times the maximum frequency of the signal. 2. The fence phenomenon is related to the resolution of frequency, because the discrete Fourier transform is the Fourier time transformation between [0,2pi] interval sampling, when the sampling points are small, it can not reflect all the detail

. #innodb_log_buffer_size = 8M #1表示每次事务结束都写日志并刷新磁盘;2 indicates that each transaction writes the log but does not flush the disk (refreshed per second ),and 0 (the default ) indicates that the log is written every second and the disk is flushed. 0 indicates a loss of up to 1 seconds of data, but with the best performance. #innodb_flush_log_at_trx_commit = 1 #InnoDB行锁导致的死锁等待时间(the default value is 50S), you can change #innodb_lock_wait_timeout = [mysqldump] Quick Max_allowed_packet = 16M [MyS

1. Copy the table---SQL Server (including table structure and table data) SELECT * into Tabel_new from Table_old---oracle (just replicate table structure) CREATE table table_new as SELECT * from Table_old----Copying data----requires that the target table Table2 must exist, and since the target table Table2 already exists, we can insert constants in addition to the fields Table1 the source table.Insert into Table2 (field1,field2,...) Select Value1,value2,... from Table1　　SQL Script

Tags: Data syntax name tab DataSource ASE CTS return baseMySQL Common syntax:1. Using MySQL:(1) Understanding databases and tables:SHOW databases;Analysis: Returns a list of available databases.SHOW tables;Parse: Returns the table in the current selection library.(2) Select database:use databases;Analysis: Use does not return any results.2. Search:(1) Retrieving a single column:SELECT Prod_name from Products;Parse: This statement retrieves a column named Prod_name from the Products table using t

better: $r = mysql_query ("SELECT count (*) from user"); $d = Mysql_fetch_row ($r); $rand = Mt_rand (0, $d [0]-1); $r = mysql_query ("Select username from user LIMIT $rand, 1");* Avoid SELECT *, what should be used, will cause slow speed and network load aggravating* Using varchar type when primary key degrades performance, always sets ID for each table, preferably int (recommended unsigned), and self-increment* Use enum for a column with a limited value* Optional use of Procedure analyse () re

": ObjectId ("55b59ee00882afbc7416fed4"),"Name":"Zhangsan","Age": -}#更新 #改动name =zhangsan User's age is 20, add personality sex=1> user.sex=1 1> user.age= - -> Db.users.update ({"Name":"Zhangsan"},user); Writeresult ({"Nmatched":1,"nupserted":0,"Nmodified":1}) > Db.users.findOne (); {"_id": ObjectId ("55b59ee00882afbc7416fed4"),"Name":"Zhangsan","Age": -,"Sex":1}#删除> Db.users.remove ({"Name":"Zhangsan"}); Writeresult ({"Nremoved":1})#shell帮助文档> Help Db.help ()-On DB Methods Db.mycoll.h

Label:Last Updated on January 28, 2015, 17:08:131 -----View the System User table space2 SelectUsername,default_tablespace fromuser_users;3 -----View table space usage4 SelectTablespace_name,sum(bytes)/1024x768/1024x768Cnt_mb fromDba_segmentsGroup byTablespace_nameORDER byCnt_mbASC;5 ----View the storage path for table spaces6 SelectT.* fromDba_data_files t;7 ----View storage information for departmental table spaces8 SelectT.tablespace_name,t.file_name, T.status fromDba_data_files T;Summary

, specifically, with the left join instead of the not and not exist, with the inner join instead of in and exist, which can greatly improve efficiency. Specific examples are as follows:A, not in, not EXISTS related subquery can use the left join instead of the notation. SELECT pub_nameFrom publisherswhere pub_id not in (SELECT pub_id from the TITLES WHERE TYPE = ' business ')Can be changed to write:SELECT A.pub_nameFrom publishers A, left JOIN, TITLES B on b.type = "Business" and a.pub_id=b. pub

Label:1.ADB devices2. Grab adb log:adb logcat-v time >test.log (log stored directly in PC user name)3.ADB Install package address (can be dragged directly to the window) installing the app4.ADB Uninstall PackageName Uninstall application5. Check your phone's memory:ADB Shell Cat/proc/meminfo6. View the PID of an application:EG:ADB Shell PS | grep QQ7. Check the CPU usage of an app:ADB shell top-m 10-s CPU (-m display maximum number,-s sort by specified line) 8. View memory usage for an app: adb

Long 8 Q unsigned long long Long 8 F Float Float 4 D Double Float 8 S Char[] String 1 P Char[] String 1 P void * Long 　 2. Little-endian Big-endian's understanding, x86 is generally Little-endianThe following are fixed lengths, the problem is to find Forminfo_offset, Metadata_length and Metadata_offset:F

edge can be completed by increasing the judgment processing.Here is the main explanation of the third step of the content1, first inside a layer of SQLSELECT T_time,t_isom,row_number () over (order by T_time)-row_number () over (PARTITION by T_isom ORDER by T_time) x , Lea D (t_time) over (order by T_time) as Dnext,lag (T_time) through (order by T_time) as Dpre from test_dateThe main row_number () over (order by T_time) and Row_number () over (PARTITION by T_isom ORDER by T_time)

skip the password2, keep the cmd of the previous step does not close, the administrator runs another cmd, directly enter Mysql-u root-p Enter, display the input password, the direct return can be password-free login3, you can change the root password in the second cmd (see two).Note: The process MySQL does not have a net start MySQL operation.Four, net start MySQL when there is no startCheck to see if it is started, or if there is a mysqld.exe process running in the process.MyEclipse Database E

,index_name) c, (Selecttable_schema,table_name,max (cardinality) car frominformation_schema. STATISTICS whereindex_name= ' PRIMARY ' andtable_schema != ' MySQL ' groupbytable_schema,table_name) p wherec.table_name=p.table_Nameandc.table_schema=p.table_schemaandp.car>0and c.car/p.car Results: 4. Composite PRIMARY KeySince InnoDB is a clustered table, each two-level index will contain primary key values. A composite primary key causes a two-level index to be large, affecting two-level index q

This is a summary of the study notes, please click on the section to see the contents.Chapter I, Fundamentals of Computer and Linux Basic introductionhttp://blog.51cto.com/13683480/2095433The second chapter, Linux Foundationhttp://blog.51cto.com/13683480/2095427Chapter III, document managementhttp://blog.51cto.com/13683480/2095428Fourth chapter, Standard I/O and pipinghttp://blog.51cto.com/13683480/2095434Fifth chapter, user groups and Rights managementhttp://blog.51cto.com/13683480/2095424Linux

' fromdate_addorderbyuid, ' date ' ) Ast1, (select @countday: =0, @group_id: =0, @last_uid: = ', @last_date: = ') ast2) as t3groupbygroup_id Select Uid,min (date) as MinDate, Max (date) as Maxdate,max (Countday) countday,group_concat (date) dates from (select UID, ' Date ', @countday: = (@last_uid: =uid anddatediff (' Date ', @last_date) =1) then (@countday + 1) Else 1 end) as Countday , (@group_id: = (@group_id +if (@countday =1,1,0))) as group_id, @last_uid: =uid as Last_uid, @last_date: =

Tags: steps lis main virtual machine org move git install TE divUbuntu prompt function is very powerful, generally if you want to install what software, you can enter the name directly, then there will be prompted, the installation format is generally:sudo apt install nameInstalling VirtualBox 5 in ubuntu16.04sudo sh-c ' echo ' Deb Http://download.virtualbox.org/virtualbox/debian xenial contrib ">>/ETC/APT/SOURCES.LIST.D /virtualbox.list '-Q https://www.virtualbox.org/download/oracle_vbox_2016.

the program, the process has terminated Ctrl + A cursor moves to the beginning (ahead of line), equivalent to the usual home keyCtrl +e cursor moves to end of lineCtrl + F cursor moves forward (forward) one character positionCtrl + b cursor back (backward) move one character positionCtrl + L clear screen, equivalent to execute clear commandCtrl + R display: Prompt to find relevant historical commands according to user input (Reverse-i-search)Ctrl + W Deletes the beginning of the current word (w

Building continuous integration first of all to understand what is continuous integration, with a clear goal to build a continuous integration environment in order to let us go a lot less detours. Continuous integration (continuous integration), or CI, is a software developm

The maximum continuous subsequences and problems are very old interview questions. The best solution is O (N) Complexity. Of course, some of the smaller ones are worth noting. Here we will summarize three common solutions, focusing on the last O (N) solution. Note that in some questions, the maximum continuous subsequences and if they are negative, 0 is returned. In this question, the maximum