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Overview
| Comment: | Enhance the showdb tool with options to show PTRMAP usage and content. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
06bd91305ed6752315c5224be5f89e87 |
| User & Date: | drh 2013-02-19 22:26:51 |
Context
|
2013-02-20
| ||
| 00:54 | On Minix, disable the ".timer" command in the shell in order to avoid calling getrusage(). (check-in: 9bd9bd9c user: drh tags: trunk) | |
|
2013-02-19
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| 22:26 | Enhance the showdb tool with options to show PTRMAP usage and content. (check-in: 06bd9130 user: drh tags: trunk) | |
| 20:25 | Fix the showdb utility so that it displays the correct secondary usage of a page when reporting on an error of a page being used more than once. (check-in: 4507f0b3 user: drh tags: trunk) | |
Changes
Changes to tool/showdb.c.
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i, pgno);
}
free(a);
parent = pgno;
pgno = iNext;
}
}
/*
** Try to figure out how every page in the database file is being used.
*/
static void page_usage_report(const char *zDbName){
int i, j;
int rc;
................................................................................
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");
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":"");
................................................................................
for(i=1; i<=mxPage; i++){
printf("%5d: %s\n", i, zPageUse[i] ? zPageUse[i] : "???");
sqlite3_free(zPageUse[i]);
}
sqlite3_free(zPageUse);
zPageUse = 0;
}
/*
** Print a usage comment
*/
static void usage(const char *argv0){
fprintf(stderr, "Usage %s FILENAME ?args...?\n\n", argv0);
fprintf(stderr,
"args:\n"
" dbheader Show database header\n"
" pgidx Index of how each page is used\n"
" NNN..MMM Show hex of pages NNN through MMM\n"
" NNN..end Show hex of pages NNN through end of file\n"
" NNNb Decode btree page NNN\n"
" NNNbc Decode btree page NNN and show content\n"
" NNNbm Decode btree page NNN and show a layout map\n"
" NNNt Decode freelist trunk page NNN\n"
" NNNtd Show leaf freelist pages on the decode\n"
................................................................................
if( strcmp(argv[i], "dbheader")==0 ){
print_db_header();
continue;
}
if( strcmp(argv[i], "pgidx")==0 ){
page_usage_report(argv[1]);
continue;
}
if( !isdigit(argv[i][0]) ){
fprintf(stderr, "%s: unknown option: [%s]\n", argv[0], argv[i]);
continue;
}
iStart = strtol(argv[i], &zLeft, 0);
if( zLeft && strcmp(zLeft,"..end")==0 ){
|
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i, pgno);
}
free(a);
parent = pgno;
pgno = iNext;
}
}
/*
** Determine pages used as PTRMAP pages
*/
static void page_usage_ptrmap(unsigned char *a){
if( a[55] ){
int usable = pagesize - a[20];
int pgno = 2;
int perPage = usable/5;
while( pgno<=mxPage ){
page_usage_msg(pgno, "PTRMAP page covering %d..%d",
pgno+1, pgno+perPage);
pgno += perPage + 1;
}
}
}
/*
** Try to figure out how every page in the database file is being used.
*/
static void page_usage_report(const char *zDbName){
int i, j;
int rc;
................................................................................
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));
page_usage_ptrmap(a);
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":"");
................................................................................
for(i=1; i<=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 ptrmap_coverage_report(const char *zDbName){
unsigned int pgno;
unsigned char *aHdr;
unsigned char *a;
int usable;
int perPage;
unsigned int i;
/* Avoid the pathological case */
if( mxPage<1 ){
printf("empty database\n");
return;
}
/* Make sure PTRMAPs are used in this database */
aHdr = getContent(0, 100);
if( aHdr[55]==0 ){
printf("database does not use PTRMAP pages\n");
return;
}
usable = pagesize - aHdr[20];
perPage = usable/5;
free(aHdr);
printf("%5d: root of sqlite_master\n", 1);
for(pgno=2; pgno<=mxPage; pgno += perPage+1){
printf("%5d: PTRMAP page covering %d..%d\n", pgno,
pgno+1, pgno+perPage);
a = getContent((pgno-1)*pagesize, usable);
for(i=0; i+5<=usable && pgno+1+i/5<=mxPage; i+=5){
const char *zType = "???";
unsigned int iFrom = decodeInt32(&a[i+1]);
switch( a[i] ){
case 1: zType = "b-tree root page"; break;
case 2: zType = "freelist page"; break;
case 3: zType = "first page of overflow"; break;
case 4: zType = "later page of overflow"; break;
case 5: zType = "b-tree non-root page"; break;
}
printf("%5d: %s, parent=%u\n", pgno+1+i/5, zType, iFrom);
}
free(a);
}
}
/*
** Print a usage comment
*/
static void usage(const char *argv0){
fprintf(stderr, "Usage %s FILENAME ?args...?\n\n", argv0);
fprintf(stderr,
"args:\n"
" dbheader Show database header\n"
" pgidx Index of how each page is used\n"
" ptrmap Show all PTRMAP page content\n"
" NNN..MMM Show hex of pages NNN through MMM\n"
" NNN..end Show hex of pages NNN through end of file\n"
" NNNb Decode btree page NNN\n"
" NNNbc Decode btree page NNN and show content\n"
" NNNbm Decode btree page NNN and show a layout map\n"
" NNNt Decode freelist trunk page NNN\n"
" NNNtd Show leaf freelist pages on the decode\n"
................................................................................
if( strcmp(argv[i], "dbheader")==0 ){
print_db_header();
continue;
}
if( strcmp(argv[i], "pgidx")==0 ){
page_usage_report(argv[1]);
continue;
}
if( strcmp(argv[i], "ptrmap")==0 ){
ptrmap_coverage_report(argv[1]);
continue;
}
if( strcmp(argv[i], "help")==0 ){
usage(argv[0]);
continue;
}
if( !isdigit(argv[i][0]) ){
fprintf(stderr, "%s: unknown option: [%s]\n", argv[0], argv[i]);
continue;
}
iStart = strtol(argv[i], &zLeft, 0);
if( zLeft && strcmp(zLeft,"..end")==0 ){
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