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Change the mmap_limit pragma to report the new limit, or to report the

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existing limit if called with no arguments.  Report the default mmap_limit
as part of PRAGMA compile_options.  Set the default mmmap_limit to 0 for
all systems other than linux, mac, windows, and solaris.

FossilOrigin-Name: 2d9f1327fe79e40435ce1e2594d7cd9a5aea0ef2
This commit is contained in:
drh
2013-04-03 13:09:18 +00:00
parent 6c96946475
commit 34f7490311
10 changed files with 43 additions and 33 deletions
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14
src/pragma.c
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@@ -759,19 +759,23 @@ void sqlite3Pragma(
** upper layers will never invoke the xFetch interfaces to the VFS.
*/
if( sqlite3StrICmp(zLeft,"mmap_limit")==0 ){
sqlite3_int64 mx;
assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
if( zRight ){
sqlite3_int64 size;
int ii;
sqlite3Atoi64(zRight, &size, 1000, SQLITE_UTF8);
if( size<0 ) size = sqlite3GlobalConfig.mxMmap;
if( pId2->n==0 ) db->mxMmap = size;
sqlite3Atoi64(zRight, &mx, 1000, SQLITE_UTF8);
if( mx<0 ) mx = sqlite3GlobalConfig.mxMmap;
if( pId2->n==0 ) db->mxMmap = mx;
for(ii=db->nDb-1; ii>=0; ii--){
if( db->aDb[ii].pBt && (ii==iDb || pId2->n==0) ){
sqlite3BtreeSetMmapLimit(db->aDb[ii].pBt, size);
sqlite3BtreeSetMmapLimit(db->aDb[ii].pBt, mx);
}
}
}
mx = -1;
if( sqlite3_file_control(db,zDb,SQLITE_FCNTL_MMAP_LIMIT,&mx)==SQLITE_OK ){
returnSingleInt(pParse, "mmap_limit", mx);
}
}else
/*