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Oracle 11.2.0.4 RAC FOR redhat 6.4 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...成修改语句：
Sql代码
1.select 'alter table '||table_name||' allocate extent;' from user_tables where num_rows=0
然后就在结果窗口里面生成了下面那些东西：
Sql代码
1.alter table E2USER_STATE allocate extent;
2.alter table ENTERPRISE_E2USER allocat...
How does delete[] “know” the size of the operand array?
...
When you allocate memory on the heap, your allocator will keep track of how much memory you have allocated. This is usually stored in a "head" segment just before the memory that you get allocated. That way when it's time to free the ...
How to remove/delete a large file from commit history in Git repository?
...ou run above code, you will get nice human-readable output like this:
...
0d99bb931299 530KiB path/to/some-image.jpg
2ba44098e28f 12MiB path/to/hires-image.png
bd1741ddce0d 63MiB path/to/some-video-1080p.mp4
???? Fast File Removal ????
Suppose you then want to remove the files a and b from ...
C++ new int[0] — will it allocate memory?
... When the value of the expression in a direct-new-declarator is zero, the allocation function is called to allocate an array with no elements.
From 3.7.3.1/2
The effect of dereferencing a pointer returned as a request for zero size is undefined.
Also
Even if the size of the space reques...
STL中map容器使用自定义key类型报错详解 - C/C++ - 清泛网 - 专注C/C++及内核技术
...对正在编译的类 模板 实例化“std::_Tmap_traits<_Kty,_Ty,_Pr,_Alloc,_Mfl>”的引用
1> with
1> [
1> _Kty=a,
1> _Ty=int,
1> _Pr=std::less<a>,
1> _Alloc=std::allocator<std::pair<const a,int>>,
1> _Mf...
What's the Hi/Lo algorithm?
...erability with other 3rd-party clients that are not aware of this sequence allocation strategy.
Being both efficient and interoperable with other systems, the pooled-lo optimizer is a much better candidate than the legacy hi/lo identifier strategy.
...
When vectors are allocated, do they use memory on the heap or the stack?
...
vector<Type> vect;
will allocate the vector, i.e. the header info, on the stack, but the elements on the free store ("heap").
vector<Type> *vect = new vector<Type>;
allocates everything on the free store.
vector<Type*> vect;
...
Why malloc+memset is slower than calloc?
It's known that calloc is different than malloc in that it initializes the memory allocated. With calloc , the memory is set to zero. With malloc , the memory is not cleared.
...
How to add 2 buttons into the UINavigationbar on the right side without IB?
...ith iOS 5+ it's as easy as:
UIBarButtonItem *btnShare = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action:@selector(share)];
UIBarButtonItem *btnRefresh = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh target:self ...
What is the meaning of the term arena in relation to memory?
...
An arena is just a large, contiguous piece of memory that you allocate once and then use to manage memory manually by handing out parts of that memory. For example:
char * arena = malloc(HUGE_NUMBER);
unsigned int current = 0;
void * my_malloc(size_t n) { current += n; return arena +...