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Enhance the stat VFS to report out the total size of all pages used by

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a table, even if the ZIPVFS compression backend is in play.  Update
the sqlite3_analyzer logic to use these new outputs.

FossilOrigin-Name: 19b8eaaf70db82d401d33beb7fd36045d5e8326f
This commit is contained in:
drh
2011-09-28 00:50:14 +00:00
parent f08f3843b7
commit 4c9f129d60
5 changed files with 68 additions and 35 deletions
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44
src/test_stat.c
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@@ -64,20 +64,11 @@
" ncell INTEGER, /* Cells on page (0 for overflow) */" \
" payload INTEGER, /* Bytes of payload on this page */" \
" unused INTEGER, /* Bytes of unused space on this page */" \
" mx_payload INTEGER /* Largest payload size of all cells */" \
" mx_payload INTEGER, /* Largest payload size of all cells */" \
" pgoffset INTEGER, /* Offset of page in file */" \
" pgsize INTEGER /* Size of the page */" \
");"
#if 0
#define VTAB_SCHEMA2 \
"CREATE TABLE yy( " \
" pageno INTEGER, /* B-tree page number */" \
" cellno INTEGER, /* Cell number within page */" \
" local INTEGER, /* Bytes of content stored locally */" \
" payload INTEGER, /* Total cell payload size */" \
" novfl INTEGER /* Number of overflow pages */" \
");"
#endif
typedef struct StatTable StatTable;
typedef struct StatCursor StatCursor;
@@ -126,6 +117,8 @@ struct StatCursor {
int nPayload; /* Value of 'payload' column */
int nUnused; /* Value of 'unused' column */
int nMxPayload; /* Value of 'mx_payload' column */
i64 iOffset; /* Value of 'pgOffset' column */
int szPage; /* Value of 'pgSize' column */
};
struct StatTable {
@@ -283,6 +276,7 @@ static int statDecodePage(Btree *pBt, StatPage *p){
int iOff;
int nHdr;
int isLeaf;
int szPage;
u8 *aData = sqlite3PagerGetData(p->pPg);
u8 *aHdr = &aData[p->iPgno==1 ? 100 : 0];
@@ -303,10 +297,11 @@ static int statDecodePage(Btree *pBt, StatPage *p){
}
p->nUnused = nUnused;
p->iRightChildPg = isLeaf ? 0 : sqlite3Get4byte(&aHdr[8]);
szPage = sqlite3BtreeGetPageSize(pBt);
if( p->nCell ){
int i; /* Used to iterate through cells */
int nUsable = sqlite3BtreeGetPageSize(pBt) - sqlite3BtreeGetReserve(pBt);
int nUsable = szPage - sqlite3BtreeGetReserve(pBt);
p->aCell = sqlite3_malloc((p->nCell+1) * sizeof(StatCell));
memset(p->aCell, 0, (p->nCell+1) * sizeof(StatCell));
@@ -451,12 +446,28 @@ static int statNext(sqlite3_vtab_cursor *pCursor){
*/
if( rc==SQLITE_OK ){
int i;
sqlite3_file *fd;
sqlite3_int64 x[2];
StatPage *p = &pCsr->aPage[pCsr->iPage];
pCsr->zName = (char *)sqlite3_column_text(pCsr->pStmt, 0);
pCsr->iPageno = p->iPgno;
statDecodePage(pBt, p);
/* The default page size and offset */
pCsr->szPage = sqlite3BtreeGetPageSize(pBt);
pCsr->iOffset = pCsr->szPage * (p->iPgno - 1);
/* If connected to a ZIPVFS backend, override the page size and
** offset with actual values obtained from ZIPVFS.
*/
fd = sqlite3PagerFile(pPager);
x[0] = p->iPgno;
if( sqlite3OsFileControl(fd, 230440, &x)==SQLITE_OK ){
pCsr->iOffset = x[0];
pCsr->szPage = x[1];
}
switch( p->flags ){
case 0x05: /* table internal */
case 0x02: /* index internal */
@@ -531,6 +542,12 @@ static int statColumn(
case 7: /* mx_payload */
sqlite3_result_int(ctx, pCsr->nMxPayload);
break;
case 8: /* pgoffset */
sqlite3_result_int64(ctx, pCsr->iOffset);
break;
case 9: /* pgsize */
sqlite3_result_int(ctx, pCsr->szPage);
break;
}
return SQLITE_OK;
}
@@ -607,4 +624,3 @@ int SqlitetestStat_Init(Tcl_Interp *interp){
return TCL_OK;
}
#endif /* if defined(SQLITE_TEST) || TCLSH==2 */