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In the MySQL partition table, the partition field is modified online. In the future, we will learn about partition (2)-> subpartitions and how to process null values.

null values.For example, the following create table statement is valid:If no primary key is specified and no partition field is specified during definition, the following error occurs: Mysql> Create Table tm3 (-> S1 char (32)-> partition by key ()-> partitions 10; error 1488 (hy000 ): field in list of fields for partition function not found in table add partition field in definition, add the column in define, It is okmysql> Create Table tm3 (-> S1 char (32) ->)-> partition by key (S1)-> partiti

Java Date Conversion

PublicClassdatetest {/** Two common types of date formats * YYYY-MM-DD * YYYY/MM/DD*/PublicStaticvoid Main (string[] args)Throwsparseexception {//01.Date Convert to String Date date=NewDate (); SYSTEM.OUT.PRINTLN (date);//Use date conversion class SimpleDateFormat format=New SimpleDateFormat ("yyyy-mm-dd HH:MM:SS");//Convert dates to StringsSystem.out.println (Format.format (date));//02. String converted to Date string str= "2016-11-12 03:58:32"; Date=Format.parse (str); SYSTEM.OUT.PRINTLN (date

Query MongoDB oplog.rs

Tags: oplog.rs;oplog timestampOplog is the capped Collection, which allocates 5% of the free disk space by default.Look at the look of oplog.rs:Rs_test:secondary>uselocal switchedtodblocal rs_test:SECONDARY> Db.oplog.rs.findOne (); { "ts" :timestamp (1465879171,238), "H" :numberlong (" -2275413922284641862"), "V" :2, "Op" : "U", "ns" : "mydb.synctable", "O2" :{ "_id" : "bbf80260-3d58-49f1-9c8c-e093d5d57527" }, "O" :{ "_id" :"bbf80260-3d58

SRS Srshlscache::reap_segment Detailed

the key frame to th e new segment. * So, the user must reap_segment then flush_video to HLS muxer. */int srshlscache::reap_segment (String log_desc, srshlsmuxer* muxer, int64_t segment_start_dts) {int ret = ERROR_SU ccess; /* Todo:flush audio before or after segment? * Todo:fresh segment begin with audio or video? */* Close current TS. */* The function constructs a m3u8 file that updates all TS

VBS solves the problem of txt text data related problems implementation code _vbs

: Set fso = CreateObject ("Scripting.FileSystemObject") Set File=fso.opentextfile ("1.txt") TS = File.readall File.close Set fil = Fso.createtextfile ("2.txt") Ts=replace (TS, "Value _", "a") Ts=replace (TS, "Occurrence frequency", "=") "If there is a horizontal

MongoDB mistakenly deleted table recovery

("59354baa02d9a99ab2f879c9"), "name": "D"}This table and other tables are updated after the delete operation.Rs_test01:primary> Db.giveget_card.find (); {"_id": ObjectId ("59354c28d905432aeaccd53c"), "id": 5} {"_id": ObjectId ("59354c2bd905432aeaccd53d"), "id": 6} Rs_test01:primary> Db.tab.find (); {"_id": ObjectId ("59354ba202d9a99ab2f879c6"), "name": "A"} {"_id": ObjectId ("59354ba602d9a99ab2f879c7"), "name": "B"} {"_id": ObjectId ("59354ba802d9a99ab2f879c8"), "name": "C"} {"_id": ObjectId ("

Example of mybatis

the SQL statement named gettest as a class. Package org. mybatis. test;Import org. mybatis. Test. util;Import org. mybatis. Test. Test;Import org. Apache. ibatis. session. sqlsession;Public class gettest { Public test getvalue (intID){SqlsessionSession =Util. getsqlsessionfactory (). opensession ();Test Ts = NULL;Try{TS = (TEST) Session. selectone ("temo-apper. selectbyid", ID); // selectID }Catch (excepti

Timer mechanism and process scheduling under nohz

high resolution timers are disabled (either compile* Or runtime ).*/Int tick_check_oneshot_change (INT allow_nohz){Struct tick_sched * Ts = __ get_cpu_var (tick_cpu_sched ); If (! Test_and_clear_bit (0, TS-> check_clocks ))Return 0; If (ts-> nohz_mode! = Nohz_mode_inactive)Return 0; If (! Timekeeping_is_continuous () |! Tick_is_oneshot_available ())Return

S functions in MATLAB

until it ends. In the workspace of Matlab, enter edit sfuntmpl (this is the S function template provided by MATLAB). Let's take a look at it to analyze the structure of S function. Its first line is like this: function [sys, x0, STR, ts] = sfuntmpl (t, x, u, flag) first describes the meaning of input and output variables: t indicates the sampling time, X indicates the state variable, and u indicates the input (which is used as the input of the simuli

Control registers Cr0, CR2

Linux Kernel full analysis-Based on 0.12 kernel chapter 4th 80 x86 protection mode and Programming Control Register (Cr0 ~ (3-3) used to control and determine the operating mode of the processor and the features of the current task, as shown in Figure 4-3. Cr0 contains the system control mark that controls the operating mode and status of the processor; CR1 is not needed; Cr2 contains the linear address that leads to page errors; Cr 3 contains the base address of the page Directory table physic

Temporary tablespace 100% solution

or invalid Kill session, recycle and contract A. check who is using the temporary segment.SQL> SELECT username,Sid,Serial #,SQL _address,Machine,Program,Tablespace,Segtype,ContentsFROM v $ session se,V $ sort_usage suWHERE se. saddr = su. session_addr Kill a process using a temporary segmentSQL> Alter system kill session 'sid, serial #'; Shrink TEMP tablespaceSQL> Alter tablespace TEMP coalesce; Use diagnostic eventsDetermine the ts of the TEMP table

Conversions between dates

Public classDatetest {/** There are only two types of date formats * YYYY-MM-DD * YYYY/MM/DD*/ Public Static voidMain (string[] args)throwsParseException {//01.Date Convert to StringDate date=NewDate (); SYSTEM.OUT.PRINTLN (date); //using the date conversion classSimpleDateFormat format=NewSimpleDateFormat ("yyyy-mm-dd HH:MM:SS"); //convert dates to StringsSystem.out.println (Format.format (date)); //02. String converted to DateString str= "2016-11-12 03:58:32"; Date=format.parse (str

Thinking and analysis of DC transform Beginners

understanding it, it is important to note that this balance is attainable, which is necessary for the perfectionist. Because many books come up to assume that the circuit is in equilibrium, it is disappointing. Now see what the physical quantities are, inductor l , capacitance c r uin d ts uout 1, according to a period of inductance current cycle balance, can be based on the inductor voltage and current relationship to deduce, can be exp

The typescript+react of Nodejs ecological Circle

global catalog parameter. In the local directoryOnce the installation is complete, we can use the TSC command provided by the Typescript Software library to compile the TS code into JS and use typings to download the d.ts definition files for public class libraries that are not written in TS language. Replace NPM Warehouse Source Because NPM is associated with our domestic network abroad, it

C Language lexical analyzer written in Java

(String str) {Char ch;int i;For (I=0;iCh=str.charat (i);Non-numeric strings and non-English lettersif ((I==0!isletter (ch)) | | (!isdigit (CH) !isletter (CH))) {Break}}if (Ireturn false;}else{return true;}}/**** Preprocessing function*/public string prefunction (String str) {String ts= "";int i;Char Ch,nc;Here's IFor (I=0;iCh=str.charat (i);Nc=str.charat (i+1);if (ch== ' \ n ') {///If the character is a line break, it will be \ n replaced by $Ch= ' $

Dba_indexes View Performance Analysis _ Database other

; set Autot trace sql> Select * FR Om dba_indexes; 1242 rows selected. Execution Plan----------------------------------------------------------0 SELECT STATEMENT optimizer=choose 1 0 NESTED LOOPS (OUTER) 2 1 NESTED LOOPS (OUTER) 3 2 NESTED LOOPS 4 3 NESTED LOOPS 5 4 NESTED LOOPS (OUTER) 6 5 NESTED LOOPS 7 6 NESTED LOOPS (OUTER) 8 7 NESTED LOOPS 9 8 TABLE AC CESS (Full) ' obj$ ' 8 TABLE ACCESS (by INDEX ROWID) of ' ind$ ' (UNIQUE SCAN) of ' i_ IND1 ' (UNIQUE) 7 TABLE ACCESS (by INDEX ROWID) o

Henry notes the analysis of the structure of-winform DataGrid (i)

DataTable as a data source for the DataGrid Label1.parent = DataGrid1 Label1.backcolor = Color.transparent Dim DT as DataTable DT = DATASET1.TABLES.ADD ("MyTable") Dt. Columns.Add ("Column 1", GetType (String)) Dt. Columns.Add ("Column 2", GetType (Integer)) Dim row, row1 as DataRow row = dt. NewRow () row! column 1 = "Line 1" row! column 2 = 1 Dt. Rows.Add (Row) Row1 = dt. NewRow () row1! column 1 = "Line 2" row1! Column 2 = 12 Dt. Rows.Add (ROW1) ' Construction completed Di

In-depth analysis of foreach problems in php

array. So why is the key ($ arr) always 1 and the current ($ arr) always B? Use vld to view the compiled opcode: We can see from the ASSIGN command in line 1 that assigns array ('A', 'B', 'C') to $ arr. Since $ arr is CV and array ('A', 'B', 'C') is TMP, The ASSIGN command finds the actually executed function as ZEND_ASSIGN_SPEC_CV_TMP_HANDLER. Note that CV is a variable cache added after PHP5.1. it uses an array to save zval **, when the cached variable is used again, you do not need to searc

TimeSpan usage in ASP. NET, asp. nettimespan

string DateDiff (DateTime DateTime1, DateTime DateTime2){String dateDiff = null;TimeSpan ts1 = new TimeSpan (DateTime1.Ticks );TimeSpan ts2 = new TimeSpan (DateTime2.Ticks );TimeSpan ts = ts1.Subtract (ts2). Duration ();DateDiff = ts. days. toString () + "day" + ts. hours. toString () + "Hour" + ts. minutes. toString

POJ 2184 Cow Exhibition Dairy Show (01 backpack, severe deformation)

Test instructions: There is a cow to prove that the cow is not stupid, so take some cow partners to prove themselves. Cows have an IQ and a sense of humor, both of which can be negative (difficult here), requiring that all cows ' IQ and/or sense of humor are not negative. The maximum value of the sum of the two.Idea: Each cow can be brought or not on, is 01 knapsack problem. But the problem is that there is no obvious knapsack capacity limit, but there are some limitations that are not negative,

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