Thank you Simon, I totally understand you.
And still hope for someone to give me some advice about my wal+mmap (Map
file when opening it and do not truncate the file) .
Thanks.
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On 25 Jan 2018, at 5:55am, Nick wrote:
> The one thing that bothers me the most is that I have no way to check my
> code, as there is a testvfs in sqlite test. So could you please review my
> train of thought about my wal+mmap? (Map file when opening it and do not
> truncate the file)
That is wa
Yup, I guess I understand you correctly about the mmap problem in the OS. I
have seen some threads about it before.
But I think wal+mmap is still a worthy consideration as db+mmap has already
been supported even though it is disabled by default. At least I think I
could use it in my own application
On 25 Jan 2018, at 1:34am, Nick wrote:
> Do you mean the corruption problems you mentioned will happen in db+mmap?
When memory-mapping was used for all file access of SQLite, some users reported
that they occasionally got corrupted databases. When memory mapping was turned
off, the problem
I ran tests in my MacOS 10.12.6.
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I use sqlite in my Android application. And I tried to run sqlite test on my
MacOS PC. Some cases failed but I can not figure out it is indeed a
corruption.
Do you mean the corruption problems you mentioned will happen in db+mmap? I
guess it should happen in both wal+mmap and db+mmap if it exists.
On 24 Jan 2018, at 11:35am, Nick wrote:
> As I found
> there will be a little improvement if I support MMAP to wal file.
Which OS are you using ? The developers of SQLite have previously had
corruption problems with memory-mapping under some versions of Windows and
macOS. Corruption occurs r
I am trying to make some changes to the source code of sqlite. As I found
there will be a little improvement if I support MMAP to wal file. I guess
the optimization is micro but it is useful in my test and this is a good way
for me to study the code of sqlite :D
1.wal+mmap
I could use unixMapfile(
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