VACUUM with multiplex does not delete chunks on Windows (fossil [8ce2b74a82]).
It seems this is because the file handle(s) are still held open by the
multiplex layer when xDelete is triggered. Since Windows can not delete open
files, they are kept.
I have not investigated this in depth, but closing the file handle before
deleting the file works well for my simple test case. Here is the change in
multiplexSubClose():
static void multiplexSubClose(
multiplexGroup *pGroup,
int iChunk,
sqlite3_vfs *pOrigVfs
){
sqlite3_file *pSubOpen = pGroup->aReal[iChunk].p;
if( pSubOpen ){
pSubOpen->pMethods->xClose(pSubOpen); /* <-- Moved here */
if( pOrigVfs ) pOrigVfs->xDelete(pOrigVfs, pGroup->aReal[iChunk].z, 0);
/* pSubOpen->pMethods->xClose(pSubOpen); <-- Moved above */
sqlite3_free(pGroup->aReal[iChunk].p);
}
sqlite3_free(pGroup->aReal[iChunk].z);
memset(&pGroup->aReal[iChunk], 0, sizeof(pGroup->aReal[iChunk]));
}
By the way: No error is returned if multiplex VACUUM fails to delete a chunk.
Maybe it should, to warn curious end users who like to investigate files with
uncommon names?
Ralf
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