diff options
Diffstat (limited to 'tool/showdb.c')
| -rw-r--r-- | tool/showdb.c | 111 |
1 files changed, 97 insertions, 14 deletions
diff --git a/tool/showdb.c b/tool/showdb.c index d378d05..27424e0 100644 --- a/tool/showdb.c +++ b/tool/showdb.c @@ -6,7 +6,11 @@ #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> + +#if !defined(_MSC_VER) #include <unistd.h> +#endif + #include <stdlib.h> #include <string.h> #include "sqlite3.h" @@ -172,7 +176,7 @@ static void print_db_header(void){ print_decode_line(aData, 56, 4, "Text encoding"); print_decode_line(aData, 60, 4, "User version"); print_decode_line(aData, 64, 4, "Incremental-vacuum mode"); - print_decode_line(aData, 68, 4, "meta[7]"); + print_decode_line(aData, 68, 4, "Application ID"); print_decode_line(aData, 72, 4, "meta[8]"); print_decode_line(aData, 76, 4, "meta[9]"); print_decode_line(aData, 80, 4, "meta[10]"); @@ -467,7 +471,7 @@ static void page_usage_msg(int pgno, const char *zFormat, ...){ zMsg = sqlite3_vmprintf(zFormat, ap); va_end(ap); if( pgno<=0 || pgno>mxPage ){ - printf("ERROR: page %d out of bounds. Range=1..%d. Msg: %s\n", + printf("ERROR: page %d out of range 1..%d: %s\n", pgno, mxPage, zMsg); sqlite3_free(zMsg); return; @@ -475,7 +479,7 @@ static void page_usage_msg(int pgno, const char *zFormat, ...){ if( zPageUse[pgno]!=0 ){ printf("ERROR: page %d used multiple times:\n", pgno); printf("ERROR: previous: %s\n", zPageUse[pgno]); - printf("ERROR: current: %s\n", zPageUse[pgno]); + printf("ERROR: current: %s\n", zMsg); sqlite3_free(zPageUse[pgno]); } zPageUse[pgno] = zMsg; @@ -612,14 +616,31 @@ static void page_usage_freelist(int pgno){ } /* +** 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; + int i, j; int rc; sqlite3 *db; sqlite3_stmt *pStmt; unsigned char *a; + char zQuery[200]; /* Avoid the pathological case */ if( mxPage<1 ){ @@ -644,20 +665,26 @@ static void page_usage_report(const char *zDbName){ /* 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"); - 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)); + 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, sqlite3_column_text(pStmt, 1)); + } + }else{ + printf("ERROR: cannot query database: %s\n", sqlite3_errmsg(db)); } - }else{ - printf("ERROR: cannot query database: %s\n", sqlite3_errmsg(db)); + rc = sqlite3_finalize(pStmt); + if( rc==SQLITE_OK ) break; } - sqlite3_finalize(pStmt); sqlite3_close(db); /* Print the report and free memory used */ @@ -670,6 +697,53 @@ static void page_usage_report(const char *zDbName){ } /* +** 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){ @@ -678,6 +752,7 @@ static void usage(const char *argv0){ "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" @@ -727,6 +802,14 @@ int main(int argc, char **argv){ 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; |