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What is the heap? |
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The heap is where malloc(), calloc(), and realloc() get memory.
Getting memory from the heap is much slower than getting it from the stack. On the other hand, the heap is much more flexible than the stack. Memory can be allocated at any time and deallocated in any order. Such memory isn?t deallocated automatically; you have to call free().
Recursive data structures are almost always implemented with memory from the heap. Strings often come from there too, especially strings that could be very long at runtime. If you can keep data in a local variable (and allocate it from the stack), your code will run faster than if you put the data on the heap. Sometimes you can use a better algorithm if you use the heap?faster, or more robust, or more flexible. It?s a tradeoff.
If memory is allocated from the heap, it?s available until the program ends. That?s great if you remember to deallocate it when you?re done. If you forget, it?s a problem. A ?memory leak? is some allocated memory that?s no longer needed but isn?t deallocated. If you have a memory leak inside a loop, you can use up all the memory on the heap and not be able to get any more. (When that happens, the allocation functions return a null pointer.) In some environments, if a program doesn?t deallocate everything it allocated, memory stays unavailable even after the program ends.
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Latest 10 Answers
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ABAP is basic (technical) side of SAP. which helps other function of business sibe ex.financial,sales,inventory& human resource.
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Cluster index work as a primary key and as we know in a single table only one primary key should be there....Hence only one records can take cluster index.
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Select Employee.*, Department.* from Employee LEFT OUTER JOIN Department ON Employee.EmpId=Department.DeptId
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Both are the connection object but SQLCLIENT using while connect with Sqlserver database and OLEDB using while connect with MS-access database and Oracle database.
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Only 1 cluster index and 255 non cluster index.
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Because it's used to read the data from the DB as Read-only manner, only forward direction not backward..hence its not supporting edit operation.
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I will throw my wife because if my wife dies ican get another but mother is only one I cannot get another
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When mistake is found by compiler is known as ERROR , when a mistake is found by tester while testing is a BUG and when mistake is found by the end user it is known as DEFECT.
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Create customer code & transporter code, create sales order, checke the payment received then released order from Finance, delivery, billing, invoice.
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Invoice is a request sent by vendor for the payment against services/goods with all the necessary details like - Price, Rate, Quantity, Vendor Name, Vendor Address, Unique Invoice Number (From Vendor), Terms & Conditions.
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