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Overview
| Comment: | In the "pgidx" command of the showdb utility, try to identify orphaned pages and show when pages have been zeroed out. |
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| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
eed701ef919c70d891727250be6a1b62 |
| User & Date: | drh 2019-04-17 12:29:45.915 |
Context
|
2019-04-17
| ||
| 13:23 | In the "pgidx" report from "showdb", also show the number of rows on each database btree page. (check-in: 2bda9dc41c user: drh tags: trunk) | |
| 12:29 | In the "pgidx" command of the showdb utility, try to identify orphaned pages and show when pages have been zeroed out. (check-in: eed701ef91 user: drh tags: trunk) | |
| 12:07 | Small performance improvement on the variable-length integer decoder: sqlite3GetVarint(). (check-in: 5df2bf62fc user: drh tags: trunk) | |
Changes
Changes to tool/showdb.c.
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a = fileRead((ovfl-1)*(sqlite3_int64)g.pagesize, 4);
ovfl = decodeInt32(a);
sqlite3_free(a);
}
}
}
| > > > > > > | > > | > > > > > > > > > > > > > > > > > | > > | | 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 |
a = fileRead((ovfl-1)*(sqlite3_int64)g.pagesize, 4);
ovfl = decodeInt32(a);
sqlite3_free(a);
}
}
}
/*
** True if the memory is all zeros
*/
static int allZero(unsigned char *a, int n){
while( n && (a++)[0]==0 ){ n--; }
return n==0;
}
/*
** Describe the usages of a b-tree page.
**
** If parent==0, then this is the root of a btree. If parent<0 then
** this is an orphan 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>g.mxPage ) return;
a = fileRead((pgno-1)*g.pagesize, g.pagesize);
switch( a[hdr] ){
case 0: {
if( allZero(a, g.pagesize) ){
zType = "zeroed page";
}else if( parent<0 ){
return;
}else{
zType = "corrupt node";
}
break;
}
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;
default: {
if( parent<0 ) return;
zType = "corrupt node";
}
}
if( parent>0 ){
page_usage_msg(pgno, "%s [%s], child %d of page %d",
zType, zName, idx, parent);
}else if( parent==0 ){
page_usage_msg(pgno, "root %s [%s]", zType, zName);
}else{
page_usage_msg(pgno, "orphaned %s", zType);
}
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;
|
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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;
}
| > | 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 |
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++){
if( zPageUse[i]==0 ) page_usage_btree(i, -1, 0, 0);
printf("%5d: %s\n", i, zPageUse[i] ? zPageUse[i] : "???");
sqlite3_free(zPageUse[i]);
}
sqlite3_free(zPageUse);
zPageUse = 0;
}
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