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Database Indexes
... Blocking factor Bfr = B div R = 512 div 150 = 3 records/block Number of file blocks b = (r/Bfr) = (30000/3) = 10000 blocks For an index on the SSN field, assume the field size VSSN= 9 bytes, Assume the record pointer size PR= 7 bytes. Then: Index entry size RI=(VSSN+ PR)=(9+7)=16 bytes Index blockin ...
... Blocking factor Bfr = B div R = 512 div 150 = 3 records/block Number of file blocks b = (r/Bfr) = (30000/3) = 10000 blocks For an index on the SSN field, assume the field size VSSN= 9 bytes, Assume the record pointer size PR= 7 bytes. Then: Index entry size RI=(VSSN+ PR)=(9+7)=16 bytes Index blockin ...
8 Pointer Logic - CSE Wiki Policy Update
... pointer variables. A very common problem in programs is dereferencing of pointer variables that do not point to a proper object. The value 0 is typically reserved as a designated NULL pointer. It is guaranteed that no object, either statically or dynamically allocated, has this address. This value c ...
... pointer variables. A very common problem in programs is dereferencing of pointer variables that do not point to a proper object. The value 0 is typically reserved as a designated NULL pointer. It is guaranteed that no object, either statically or dynamically allocated, has this address. This value c ...
Paging: Introduction - Computer Sciences User Pages
... Let’s talk a little about page table organization. The page table is just a data structure that is used to map virtual addresses (or really, virtual page numbers) to physical addresses (physical frame numbers). Thus, any data structure could work. The simplest form is called a linear page table, whi ...
... Let’s talk a little about page table organization. The page table is just a data structure that is used to map virtual addresses (or really, virtual page numbers) to physical addresses (physical frame numbers). Thus, any data structure could work. The simplest form is called a linear page table, whi ...
Lecture 2: Arrays - The Institute of Finance Management (IFM)
... The amount of values between braces { } must not be larger than the number of elements that we declare for the array between square brackets [ ]. For example, in the example of array billy we have declared that it has 5 elements and in the list of initial values within braces { } we have specified 5 ...
... The amount of values between braces { } must not be larger than the number of elements that we declare for the array between square brackets [ ]. For example, in the example of array billy we have declared that it has 5 elements and in the list of initial values within braces { } we have specified 5 ...
Lock-Free Resizeable Concurrent Tries
... stores references to subtries inside an array, which is indexed with a bitmap. This makes hash array mapped tries both space-ecient and cache-aware the bitmap and the array can be stored within the same cache line. A similar approach was taken in the dynamic array data structures [8]. Hash array ...
... stores references to subtries inside an array, which is indexed with a bitmap. This makes hash array mapped tries both space-ecient and cache-aware the bitmap and the array can be stored within the same cache line. A similar approach was taken in the dynamic array data structures [8]. Hash array ...
Virtual Memory Management
... OS determines which virtual page needed OS checks validity of address, seeks page ...
... OS determines which virtual page needed OS checks validity of address, seeks page ...
CUTE: A Concolic Unit Testing Engine for C
... nique is to randomly choose the values over the domain of potential inputs [4,8,10,22]. The problem with such random testing is two fold: first, many sets of values may lead to the same observable behavior and are thus redundant, and second, the probability of selecting particular inputs that cause ...
... nique is to randomly choose the values over the domain of potential inputs [4,8,10,22]. The problem with such random testing is two fold: first, many sets of values may lead to the same observable behavior and are thus redundant, and second, the probability of selecting particular inputs that cause ...
lec4
... cmp = strcmp(name, tree->name); if (cmp == 0) return treep; else if (cmp < 0) return lookup(treep->left, name); else return lookup(treep->right, name); ...
... cmp = strcmp(name, tree->name); if (cmp == 0) return treep; else if (cmp < 0) return lookup(treep->left, name); else return lookup(treep->right, name); ...
11 Data Structures
... Just like in an array, we have two types of identifier in a record: the name of the record and the name of each individual field inside the record. The name of the record is the name of the whole structure, while the name of each field allows us to refer to that field. For example, in the student re ...
... Just like in an array, we have two types of identifier in a record: the name of the record and the name of each individual field inside the record. The name of the record is the name of the whole structure, while the name of each field allows us to refer to that field. For example, in the student re ...
Chapter 20 Arrays
... will compile fine but fail during execution with a Null pointer exception, since all the elements are null. It is an error to attempt to dereference a null pointer (in this case null.identify()). If widgetList is indeed to hold ten Widget objects, these objects must be created individually. Since th ...
... will compile fine but fail during execution with a Null pointer exception, since all the elements are null. It is an error to attempt to dereference a null pointer (in this case null.identify()). If widgetList is indeed to hold ten Widget objects, these objects must be created individually. Since th ...
sorted
... Objectives: To review the fundamental algorithms and data structures that are commonly used in programs. To see how to use and implement these algorithms and data structures in different languages and to see what language and library support exists for them. ...
... Objectives: To review the fundamental algorithms and data structures that are commonly used in programs. To see how to use and implement these algorithms and data structures in different languages and to see what language and library support exists for them. ...
Chap09
... length is the number of slots assigned to the array What if the array doesn’t have valid data in each of these slots? Keep a counter of how many slots have valid data and use this counter when processing the array More about this type of processing in Chapter 11 ...
... length is the number of slots assigned to the array What if the array doesn’t have valid data in each of these slots? Keep a counter of how many slots have valid data and use this counter when processing the array More about this type of processing in Chapter 11 ...
Chapter11. Skip Lists and Hashing
... headNode = new SkipNode (null, null, maxLevel + 1); tailNode = new SkipNode (tailKey, null, 0); last = new SkipNode [maxLevel + 1]; // headNode points to tailNode at all levels initially for (int i = 0; i <= maxLevel; i++) headNode.next[i] = tailNode; r = new Random(); // initialize random number ge ...
... headNode = new SkipNode (null, null, maxLevel + 1); tailNode = new SkipNode (tailKey, null, 0); last = new SkipNode [maxLevel + 1]; // headNode points to tailNode at all levels initially for (int i = 0; i <= maxLevel; i++) headNode.next[i] = tailNode; r = new Random(); // initialize random number ge ...
Min-Max Heaps and Generalized Priority Queues
... sional array V[O..m + l] and m + 1 min-max heaps T,,, . ( T,,; element V[i] contains the k;th smallest element in S (if any), and T, contains the elements whose rank is greater than V(i] and smaller than v[i + l] (where V[O] = --oo and V[m + l] = +m). Using the properties of min-max heaps, an orders ...
... sional array V[O..m + l] and m + 1 min-max heaps T,,, . ( T,,; element V[i] contains the k;th smallest element in S (if any), and T, contains the elements whose rank is greater than V(i] and smaller than v[i + l] (where V[O] = --oo and V[m + l] = +m). Using the properties of min-max heaps, an orders ...
Introduction to C - Indian Institute of Technology Kharagpur
... • A pointer is a variable that represents the location (rather than the value) of a data item. • They have a number of useful applications. – Enables us to access a variable that is defined outside the function. – Can be used to pass information back and forth between a function and its reference po ...
... • A pointer is a variable that represents the location (rather than the value) of a data item. • They have a number of useful applications. – Enables us to access a variable that is defined outside the function. – Can be used to pass information back and forth between a function and its reference po ...
Chapter 6 - Gettysburg College Computer Science
... Finally, notice that the problem was broken down into smaller tasks, such as “find the index of the smallest value” and “interchange two elements.” » These subtasks are written as separate methods and are private because they are helper methods. Users are not expected to call them directly. ...
... Finally, notice that the problem was broken down into smaller tasks, such as “find the index of the smallest value” and “interchange two elements.” » These subtasks are written as separate methods and are private because they are helper methods. Users are not expected to call them directly. ...
Generalized Symbolic Execution for Model Checking and Testing
... technique, which represents values of program variables with symbolic values instead of concrete (initialized) data and manipulates expressions involving symbolic values. Symbolic execution traditionally arose in the context of checking sequential programs with a fixed number of integer variables. ...
... technique, which represents values of program variables with symbolic values instead of concrete (initialized) data and manipulates expressions involving symbolic values. Symbolic execution traditionally arose in the context of checking sequential programs with a fixed number of integer variables. ...
ch11
... they are not used as much in Java as they are in most other languages. The reason is that the java.util package includes a class called ArrayList that provides the standard array behavior along with other useful operations. • ArrayList is a Java class rather than a special form in the language. As a ...
... they are not used as much in Java as they are in most other languages. The reason is that the java.util package includes a class called ArrayList that provides the standard array behavior along with other useful operations. • ArrayList is a Java class rather than a special form in the language. As a ...
Physical Data Organization and Indexing
... – Repeat process at next level – Height of tree increases by one ...
... – Repeat process at next level – Height of tree increases by one ...
Dictionaries and Hash Tables
... insertions and removals on a hash table take O(n) time The worst case occurs when all the keys inserted into the dictionary collide The load factor a = n/N affects the performance of a hash table Assuming that the hash values are like random numbers, it can be shown that the expected number of probe ...
... insertions and removals on a hash table take O(n) time The worst case occurs when all the keys inserted into the dictionary collide The load factor a = n/N affects the performance of a hash table Assuming that the hash values are like random numbers, it can be shown that the expected number of probe ...
ppt
... file record with search-key value Ki, or block of record pointers that point to records having search-key value Ki. (if search-key is not a key) Pnext points to next leaf node in search-key order. Within each leaf node, K1 K2 K3 … Kf-1 If Li, Lj are leaf nodes and i j, then Li’s sear ...
... file record with search-key value Ki, or block of record pointers that point to records having search-key value Ki. (if search-key is not a key) Pnext points to next leaf node in search-key order. Within each leaf node, K1 K2 K3 … Kf-1 If Li, Lj are leaf nodes and i j, then Li’s sear ...
k - Current students
... A hash function h maps each key k from a dictionary to an integer in range [0,N-1], where N is the bucket capacity. Instead of using k as an index of the bucket array, we use h(k), i.e. we store the item (k,e) in the bucket A[h(k)]. A hash function is deemed to be “good” if it minimises collisions a ...
... A hash function h maps each key k from a dictionary to an integer in range [0,N-1], where N is the bucket capacity. Instead of using k as an index of the bucket array, we use h(k), i.e. we store the item (k,e) in the bucket A[h(k)]. A hash function is deemed to be “good” if it minimises collisions a ...
Control table
![](https://commons.wikimedia.org/wiki/Special:FilePath/Control_table.png?width=300)
Control tables are tables that control the control flow or play a major part in program control. There are no rigid rules about the structure or content of a control table—its qualifying attribute is its ability to direct control flow in some way through ""execution"" by a processor or interpreter. The design of such tables is sometimes referred to as table-driven design (although this typically refers to generating code automatically from external tables rather than direct run-time tables). In some cases, control tables can be specific implementations of finite-state-machine-based automata-based programming. If there are several hierarchical levels of control table they may behave in a manner equivalent to UML state machinesControl tables often have the equivalent of conditional expressions or function references embedded in them, usually implied by their relative column position in the association list. Control tables reduce the need for programming similar structures or program statements over and over again. The two-dimensional nature of most tables makes them easier to view and update than the one-dimensional nature of program code. In some cases, non-programmers can be assigned to maintain the control tables.