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Avoid many unnecessary calls to sqlite3ReadSchema() and sqlite3Init() when

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the schema is known to be valid already.

FossilOrigin-Name: 58cf812fd81329e82b3fdd61b7ad2040c9b90d2d80f592b9231e0e1902c8d577
This commit is contained in:
drh
2018-04-25 12:01:45 +00:00
parent 3215872446
commit b2c8559fad
7 changed files with 35 additions and 26 deletions
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11
src/prepare.c
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@@ -145,6 +145,7 @@ static int sqlite3InitOne(sqlite3 *db, int iDb, char **pzErrMsg){
const char *zMasterName;
int openedTransaction = 0;
assert( (db->mDbFlags & DBFLAG_SchemaKnownOk)==0 );
assert( iDb>=0 && iDb<db->nDb );
assert( db->aDb[iDb].pSchema );
assert( sqlite3_mutex_held(db->mutex) );
@@ -396,10 +397,12 @@ int sqlite3ReadSchema(Parse *pParse){
assert( sqlite3_mutex_held(db->mutex) );
if( !db->init.busy ){
rc = sqlite3Init(db, &pParse->zErrMsg);
}
if( rc!=SQLITE_OK ){
pParse->rc = rc;
pParse->nErr++;
if( rc!=SQLITE_OK ){
pParse->rc = rc;
pParse->nErr++;
}else if( db->noSharedCache ){
db->mDbFlags |= DBFLAG_SchemaKnownOk;
}
}
return rc;
}