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ensures that the group information is found in an index without regard to all the keywords in the index (whether the WHERE clause condition is satisfied). The access method considers only a subset of the keywords in index , so it becomes the loose index scan. when there is no WHERE clause in the query statement, the loose index scan readsThe key you need is smaller than reading all keys. If the WHERE clause contains a scope condition, loose index scan looks for the first key in each group that

(c1, c2, c3), then group by c1, group by c1, c2, c1, c1, and c2 are only part of the index idx. Note that the fields used for group in the index must comply with the "leftmost prefix" principle of the index. Group by c1, c3 won't use loose index Scanning For example: Explain SELECT group_id,gmt_createFROM group_messageWHERE user_id>1GROUP BY group_id,gmt_create;

stuff to get rid* @ Param with the stuff to replace it* @ Return replaced text or null if any ARGs are null*/Public static string Replace (string text, string repl, string){If (text = NULL | repl = NULL | with = NULL | REPL. Length () = 0){Return text;} Stringbuffer Buf = new stringbuffer (text. Length ());Int searchfrom = 0;While (true){Int foundat = text. indexof (repl, searchfrom );If (foundat =-1){Break;} Buf. append (text. substring (searchfrom, foundat). append ();Searchfrom = foundat + R

"+" and "-" operations as member functions of the plural class.Rules:The real and virtual parts are added and subtracted respectively.Operands:Both operands are complex objects.# Include Using namespace STD;Class complex // plural class declaration{Public: // external interfaceComplex (double r = 0.0, double I = 0.0){Real = R;Imag = I;} // ConstructorComplex operator + (complex C2); // + reload as a member functionComplex operator-(complex

Operator overloading is essentially an overload of a function The functions of overloaded operators are generally formatted as follows: function type operator operator name (parameter list column) {Overloaded handling of operators} For example, to use "+" for the addition of complex (plural), the prototype of a function can be this: Copy Code code as follows: Complex operator + (Complex C1,complex c2); Where operator is a ke

Tags: from logs body index image sort PNG analysis equivalent A classic multi-column index case, such as the title: 假设某个表有一个联合索引（c1,c2,c3,c4）一下——只能使用该联合索引的 c1,c2,c3 部分 Awhere c1=x and c2=x and c4>x and c3=x B where c1=x and c2=x and c4=x order by c3 C where c1=x and c4= x group by c3,

newActivity, this newActivitywill still be inSingletaskthe instance ofTaskthe. For example:If there are three of my applicationsACTIVITY,C1,C2,C3, three xActivitycan start each other, whereC2to beSingletaskmode, then, regardless of how I click Start in this program, such as:C1->C2->C3->C2->C3->C1-C2,C1,C3There may be

UPDATE of MySQL lock Learning I have been learning MySQL for quite a long time and can stay in a state where I can work but I am not proficient. In addition, many MySQL knowledge points are affected by SQL Server's understanding bias. I can only continue and work hard! Because you do not understand the source code, MySQL does not provide a good view to verify the following points. Therefore, you can only talk about the test process and experiment results. Please read it with suspicion. Problem:

[LIBZIP.SO+0X3EC0] java_java_util_zip_zipfile_getentry+0xf0j 19 Java.util.zip.ZipFile.getEntry (J[BZ) J (0 bytes) @ 0x00007f90d110140e [0x00007f90d1101340+0xce]j 6501 C2 Java.util.zip.ZipFile.getEntry (ljava/lang/string;) ljava/util/zip/zipentry; (101 bytes) @ 0x00007f90d1d10708 [0x00007f90d1d10380+0x388]j 11361 C2 java.util.jar.JarFile.getEntry (ljava/lang/ String;) Ljava/util/zip/zipentry; (bytes) @ 0x00

Environment: Oracle 10.2.0.5Phenomenon: Rman allocates multiple channels, but is not actually used in parallel.To build a test case: create tablespace dbs_d_test;alter tablespace dbs_d_test add datafile; --这里是11alter tablespace dbs_d_test add datafile; --这里是12alter tablespace dbs_d_test add datafile; --这里是13alter database datafile 11,12,13 resize 1G; 1.RMAN multi-channel but not in parallel 2. The BACKUP statement overrides the use of the parallel 3. Improve efficiency by changing ba

Tags: memsql sqlfire newsql Performance1. Software versionMemsql 3.1Pivotal Sqlfire 1.1.2Oracle 11g XE2. Test environmentHomestay HostOs:windows 7 64-bit Professional Editioncpu:i7-3770 3.4GHzMemory: 16GHDD: Greater than 800GVMware virtual MachinesOs:centos 6.3 64-bitMemory: 16GWhere Memsql runs on virtual machines, Sqlfire and Oracle run directly on the hostSqlfire only open one server member3.DDLMemsqlDROP table T_main;drop table t_rel1;drop table t_rel2;drop table t_rel3;create table T_main (

Agent before restarting corevideosd.CC Communication Trojan will try to contact multiple CC servers (C2) to obtain commands and other payload. The trojan uses the first C2: kiifd [.] pozon7 [.] net on the HTTP connection port 80. The following example shows a check-in request: Here, 1AD6A35F4C2D73593912F9F9E1A55097 is the MD5 hash of IOPlatformUUID. IOPlatformUUID is obtained by executing the following OS

The list in STL is a two-way linked list that can efficiently insert and delete elements. Here we will summarize its operations. In this paper, the two List objects C1 and C2 have the element C1 (10, 20, 30) C2 (40, 50, 60 ). There is also a list Declaration structure of list object (): A. List B. List C. List D. List E. List // C5 contains the element [_ first, _ last) of C1 in a region ). 1. Assign

Question Link Http://acm.zju.edu.cn/onlinejudge/showProblem.do? Problemid = 5269 The question is very simple, and all the situations are listed directly. My AC code # Include Int main (){Int T;Int A, B, C;Char C1, C2;Int S;Scanf ("% d", T );Getchar ();While (t --){Scanf ("% d", );Getchar ();Scanf ("% C", C1 );Scanf ("% d", B );Getchar ();Scanf ("% C", C2 );Scanf ("% d", C );Getchar ();If (C1 = '*'){If

STLMediumListUsage: STLInListIs a two-way linked list that can efficiently insert and delete elements. Here we will summarize its operations. TwoListThe C1 and C2 objects have C1 (10, 20, 30) C2 (40, 50, 60) elements ). There is anotherList ListObject declaration structure (): A.List B.List C.List D.List E.List // C5 contains the element [_ First, _ Last) of c1 in a region ). 1. assign () allocation value,

; } Bytearrayoutputstream out = new Bytearrayoutputstream (); Bytearrayinputstream in = new Bytearrayinputstream (str. getBytes ("iso-8859-1")); Gzipinputstream gunzip = new Gzipinputstream (in); byte[] buffer = new BYTE[256]; int n; while ((n = gunzip.read (buffer)) >= 0) {out.write (buffer, 0, N); }//ToString () uses the platform default encoding, or it can be explicitly specified as toString ("GBK") return out.tostring (); }/** * @par

#include using namespacestd;classcomplex{ Public: Complex (DoubleR=0.0,DoubleI=0.0): Real (R), Imag (i) {} Complexoperator+ (ConstComplex c2)Const; Complexoperator- (ConstComplex c2)Const; voidDisplay ()Const;Private: DoubleReal,imag;};voidComplex::d isplay ()Const{cout"("","")"Endl;} Complex Complex::operator+ (ConstComplex c2)Const{ returnComplex (REAL+

. Orchid island master 16:12:39 Send SQL statements and execution plans. Free dolphin 16:12:55 Select n. c1, n. c2, n. c3, n. c4, n. c5From (select count (t. c1), t. c1, t. c2, t. c3, t. c4, t. c5From tab1 tWhere t. c2 not in ('val1', 'val2', 'val3', 'val4', 'val5 ')Group by t. c1, t. c2, t. c3, t. c4, t. c5) nWhere no

-- lb: 0x0 cc: 3Col 0: [1] 80Col 1: [9] 53 59 53 5f 43 30 30 37 31Col 2: [2] c1 48Tab 0, row 2, @ 0x1f84Tl: 17 fb: -- H-FL -- lb: 0x0 cc: 3Col 0: [1] 80Col 1: [8] 53 59 53 5f 43 30 30 34Col 2: [2] c1 05Tab 0, row 3, @ 0x1f70Tl: 20 fb: -- H-FL -- lb: 0x0 cc: 3Col 0: [1] 80Col 1: [10] 53 59 53 5f 43 30 30 31 34 39Col 2: [3] c2 02 32Tab 0, row 4, @ 0x1f5cTl: 20 fb: -- H-FL -- lb: 0x0 cc: 3Col 0: [1] 80Col 1: [10] 53 59 53 5f 43 30 30 31 34 35Col 2: [3]

): self.name = name Self.age = age Self.money = Money def Shopping (self): Self.money = Self.money-2long = person (' dragon ', ' 1 ') Hu = person (' Tiger ', ' 2 ') Bao = person (' Leopard ', 18 , ten) bao.shopping () print (Bao.money)Encapsulating objectsClass C1: def __init__ (self, Name, obj): self.name = name self.obj = objclass C2: def __init__ (self, name , age): self.name = name S