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By default, do not use memory mapping to access the temporary files used for external sorts. The old behaviour (to use memory mapping by default) may be restored by building with SQLITE_ENABLE_SORTER_MMAP defined.

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FossilOrigin-Name: 306694dfb462f9d1f128461e7a8f15a0bb9b21fbc696caa1832f4b20749490d1
This commit is contained in:
dan
2021-08-12 14:22:30 +00:00
parent a76b151dab
commit 0546027cd7
4 changed files with 17 additions and 9 deletions
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7
src/main.c
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@@ -3205,7 +3205,14 @@ static int openDatabase(
db->nextAutovac = -1;
db->szMmap = sqlite3GlobalConfig.szMmap;
db->nextPagesize = 0;
#ifdef SQLITE_ENABLE_SORTER_MMAP
/* Beginning with version 3.37.0, using the VFS xFetch() API to memory-map
** the temporary files used to do external sorts (see code in vdbesort.c)
** is disabled. It can still be used either by defining
** SQLITE_ENABLE_SORTER_MMAP at compile time or by using the
** SQLITE_TESTCTRL_SORTER_MMAP test-control at runtime. */
db->nMaxSorterMmap = 0x7FFFFFFF;
#endif
db->flags |= SQLITE_ShortColNames
| SQLITE_EnableTrigger
| SQLITE_EnableView