/*
** Try to figure out how every page in the database file is being used.
*/
static void page_usage_report(const char *zPrg, const char *zDbName){
int i, j;
int rc;
sqlite3 *db;
sqlite3_stmt *pStmt;
unsigned char *a;
char zQuery[200];
/* Avoid the pathological case */
if( g.mxPage<1 ){
printf("empty database\n");
return;
}
/* Open the database file */
db = openDatabase(zPrg, zDbName);
/* Set up global variables zPageUse[] and g.mxPage to record page
** usages */
zPageUse = sqlite3_malloc( sizeof(zPageUse[0])*(g.mxPage+1) );
if( zPageUse==0 ) out_of_memory();
memset(zPageUse, 0, sizeof(zPageUse[0])*(g.mxPage+1));
/* Discover the usage of each page */
a = fileRead(0, 100);
page_usage_freelist(decodeInt32(a+32));
page_usage_ptrmap(a);
sqlite3_free(a);
page_usage_btree(1, 0, 0, "sqlite_master");
sqlite3_exec(db, "PRAGMA writable_schema=ON", 0, 0, 0);
for(j=0; j<2; j++){
sqlite3_snprintf(sizeof(zQuery), zQuery,
"SELECT type, name, rootpage FROM SQLITE_MASTER WHERE rootpage"
" ORDER BY rowid %s", j?"DESC":"");
rc = sqlite3_prepare_v2(db, zQuery, -1, &pStmt, 0);
if( rc==SQLITE_OK ){
while( sqlite3_step(pStmt)==SQLITE_ROW ){
int pgno = sqlite3_column_int(pStmt, 2);
page_usage_btree(pgno, 0, 0, (const char*)sqlite3_column_text(pStmt,1));
}
}else{
printf("ERROR: cannot query database: %s\n", sqlite3_errmsg(db));
}
rc = sqlite3_finalize(pStmt);
if( rc==SQLITE_OK ) break;
}
sqlite3_close(db);
/* Print the report and free memory used */
for(i=1; i<=g.mxPage; i++){
printf("%5d: %s\n", i, zPageUse[i] ? zPageUse[i] : "???");
sqlite3_free(zPageUse[i]);
}
sqlite3_free(zPageUse);
zPageUse = 0;
}
/*
** Try to figure out how every page in the database file is being used.
*/
static void page_usage_report(const char *zDbName){
int i;
int rc;
sqlite3 *db;
sqlite3_stmt *pStmt;
unsigned char *a;
/* Avoid the pathological case */
if( mxPage<1 ){
printf("empty database\n");
return;
}
/* Open the database file */
rc = sqlite3_open(zDbName, &db);
if( rc ){
printf("cannot open database: %s\n", sqlite3_errmsg(db));
sqlite3_close(db);
return;
}
/* Set up global variables zPageUse[] and mxPage to record page
** usages */
zPageUse = sqlite3_malloc( sizeof(zPageUse[0])*(mxPage+1) );
if( zPageUse==0 ) out_of_memory();
memset(zPageUse, 0, sizeof(zPageUse[0])*(mxPage+1));
/* Discover the usage of each page */
a = getContent(0, 100);
page_usage_freelist(decodeInt32(a+32));
free(a);
page_usage_btree(1, 0, 0, "sqlite_master");
rc = sqlite3_prepare_v2(db,
"SELECT type, name, rootpage FROM SQLITE_MASTER WHERE rootpage",
-1, &pStmt, 0);
if( rc==SQLITE_OK ){
while( sqlite3_step(pStmt)==SQLITE_ROW ){
int pgno = sqlite3_column_int(pStmt, 2);
page_usage_btree(pgno, 0, 0, sqlite3_column_text(pStmt, 1));
}
}else{
printf("ERROR: cannot query database: %s\n", sqlite3_errmsg(db));
}
sqlite3_finalize(pStmt);
sqlite3_close(db);
/* Print the report and free memory used */
for(i=1; i<=mxPage; i++){
printf("%5d: %s\n", i, zPageUse[i] ? zPageUse[i] : "???");
sqlite3_free(zPageUse[i]);
}
sqlite3_free(zPageUse);
zPageUse = 0;
}
/*
** Describe the usages of a b-tree page
*/
static void page_usage_btree(
int pgno, /* Page to describe */
int parent, /* Parent of this page. 0 for root pages */
int idx, /* Which child of the parent */
const char *zName /* Name of the table */
){
unsigned char *a;
const char *zType = "corrupt node";
int nCell;
int i;
int hdr = pgno==1 ? 100 : 0;
if( pgno<=0 || pgno>mxPage ) return;
a = getContent((pgno-1)*pagesize, pagesize);
switch( a[hdr] ){
case 2: zType = "interior node of index"; break;
case 5: zType = "interior node of table"; break;
case 10: zType = "leaf of index"; break;
case 13: zType = "leaf of table"; break;
}
if( parent ){
page_usage_msg(pgno, "%s [%s], child %d of page %d",
zType, zName, idx, parent);
}else{
page_usage_msg(pgno, "root %s [%s]", zType, zName);
}
nCell = a[hdr+3]*256 + a[hdr+4];
if( a[hdr]==2 || a[hdr]==5 ){
int cellstart = hdr+12;
unsigned int child;
for(i=0; i<nCell; i++){
int ofst;
ofst = cellstart + i*2;
ofst = a[ofst]*256 + a[ofst+1];
child = decodeInt32(a+ofst);
page_usage_btree(child, pgno, i, zName);
}
child = decodeInt32(a+cellstart-4);
page_usage_btree(child, pgno, i, zName);
}
if( a[hdr]==2 || a[hdr]==10 || a[hdr]==13 ){
int cellstart = hdr + 8 + 4*(a[hdr]<=5);
for(i=0; i<nCell; i++){
int ofst;
ofst = cellstart + i*2;
ofst = a[ofst]*256 + a[ofst+1];
page_usage_cell(a[hdr], a+ofst, pgno, i);
}
}
free(a);
}