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How long is the SHA256 hash?
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varchar also doesn’t allocate space unless its used, unlike char it allocates the number of amount of total characters allowed regardless if there is data filling it.
– Xenland
Feb 11 '13 at 16:44
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Amazon EC2, mysql aborting start because InnoDB: mmap (x bytes) failed; errno 12
...e enough (512M) memory for the InnoDB buffer pool:
Fatal error: cannot allocate memory for the buffer pool
That begs three questions:
How much memory is on your instance? Should there be enough memory to accommodate the 512M InnoDB is trying to grab for the buffer pool, plus everything else...
Remove a string from the beginning of a string
...e changed for if (0 === strpos($str, $prefix)) to avoid unnecessary memory allocation while keeping the same readability :)
– xDaizu
Feb 1 '17 at 9:17
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原子vector的一种实现源码(atomic-vector) - C/C++ - 清泛网 - 专注C/C++及内核技术
...e size of an AtomicVector is with the ensureSize
* method. It does not reallocate the internal storage to grow; it allocates a
* new AtomicVector and chains to that for increased capacity. This means that
* if the initial size is too low, reading and modifying elements at high
* indexes will...
What are the undocumented features and limitations of the Windows FINDSTR command?
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009 036 124 187 212 238...
What does yield mean in PHP?
...just a simple array. You can iterate on both.
Also, the first one does not allocate a full array and is therefore less memory-demanding.
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How do I add a submodule to a sub-directory?
...ou don't have to use /., as in snippets/.: snippets is enough)
See commit 091a6eb0feed820a43663ca63dc2bc0bb247bbae:
submodule: drop the top-level requirement
Use the new rev-parse --prefix option to process all paths given to the submodule command, dropping the requirement that it be run f...
What is the difference between Scope_Identity(), Identity(), @@Identity, and Ident_Current()?
... of the inserted record from the trigger.
IdentCurrent: The last identity allocated for the table.
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How much faster is C++ than C#?
...d expect to get representative results (eg. performing thousands of memory allocations in C++ is going to give you terrible numbers.)
Instead, I wrote slightly more idiomatic C++ code and compared against the C# code @Wiory provided. The two major changes I made to the C++ code were:
1) used vect...
How do I do base64 encoding on iOS?
...t placeholder and pointer within that placeholder
strResult = (char *)calloc((((intLength + 2) / 3) * 4) + 1, sizeof(char));
objPointer = strResult;
// Iterate through everything
while (intLength > 2) { // keep going until we have less than 24 bits
*objPointer++ = _base64...