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sqlite/test/wordcount.c
drh b2a0f75c06 Remove the rarely-used scratch memory allocator. This makes the code smaller, 
faster, and easier to maintain.  In place of the scratch allocator, add the
SQLITE_CONFIG_SMALL_MALLOC configuration option that provides a hint to SQLite
that large memory allocations should be avoided.

FossilOrigin-Name: 54b000246cfb5c7b8adb61a17357ef5a49adddde9e48e8937834d5ba0beb8a6b
2017-08-28 15:51:35 +00:00

643 lines
22 KiB
C
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/*
** This C program extracts all "words" from an input document and adds them
** to an SQLite database. A "word" is any contiguous sequence of alphabetic
** characters. All digits, punctuation, and whitespace characters are
** word separators. The database stores a single entry for each distinct
** word together with a count of the number of occurrences of that word.
** A fresh database is created automatically on each run.
**
** wordcount DATABASE INPUTFILE
**
** The INPUTFILE name can be omitted, in which case input it taken from
** standard input.
**
** Option:
**
**
** Modes:
**
** Insert mode means:
** (1) INSERT OR IGNORE INTO wordcount VALUES($new,1)
** (2) UPDATE wordcount SET cnt=cnt+1 WHERE word=$new -- if (1) is a noop
**
** Update mode means:
** (1) INSERT OR IGNORE INTO wordcount VALUES($new,0)
** (2) UPDATE wordcount SET cnt=cnt+1 WHERE word=$new
**
** Replace mode means:
** (1) REPLACE INTO wordcount
** VALUES($new,ifnull((SELECT cnt FROM wordcount WHERE word=$new),0)+1);
**
** Select mode means:
** (1) SELECT 1 FROM wordcount WHERE word=$new
** (2) INSERT INTO wordcount VALUES($new,1) -- if (1) returns nothing
** (3) UPDATE wordcount SET cnt=cnt+1 WHERE word=$new --if (1) return TRUE
**
** Delete mode means:
** (1) DELETE FROM wordcount WHERE word=$new
**
** Query mode means:
** (1) SELECT cnt FROM wordcount WHERE word=$new
**
** Note that delete mode and query mode are only useful for preexisting
** databases. The wordcount table is created using IF NOT EXISTS so this
** utility can be run multiple times on the same database file. The
** --without-rowid, --nocase, and --pagesize parameters are only effective
** when creating a new database and are harmless no-ops on preexisting
** databases.
**
******************************************************************************
**
** Compile as follows:
**
** gcc -I. wordcount.c sqlite3.c -ldl -lpthreads
**
** Or:
**
** gcc -I. -DSQLITE_THREADSAFE=0 -DSQLITE_OMIT_LOAD_EXTENSION \
** wordcount.c sqlite3.c
*/
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <stdarg.h>
#include "sqlite3.h"
#ifndef _WIN32
# include <unistd.h>
#else
# include <io.h>
#endif
#define ISALPHA(X) isalpha((unsigned char)(X))
const char zHelp[] =
"Usage: wordcount [OPTIONS] DATABASE [INPUT]\n"
" --all Repeat the test for all test modes\n"
" --cachesize NNN Use a cache size of NNN\n"
" --commit NNN Commit after every NNN operations\n"
" --delete Use DELETE mode\n"
" --insert Use INSERT mode (the default)\n"
" --journal MMMM Use PRAGMA journal_mode=MMMM\n"
" --nocase Add the NOCASE collating sequence to the words.\n"
" --nosync Use PRAGMA synchronous=OFF\n"
" --pagesize NNN Use a page size of NNN\n"
" --query Use QUERY mode\n"
" --replace Use REPLACE mode\n"
" --select Use SELECT mode\n"
" --stats Show sqlite3_status() results at the end.\n"
" --summary Show summary information on the collected data.\n"
" --tag NAME Tag all output using NAME. Use only stdout.\n"
" --timer Time the operation of this program\n"
" --trace Enable sqlite3_trace() output.\n"
" --update Use UPDATE mode\n"
" --without-rowid Use a WITHOUT ROWID table to store the words.\n"
;
/* Output tag */
char *zTag = "--";
/* Return the current wall-clock time */
static sqlite3_int64 realTime(void){
static sqlite3_vfs *clockVfs = 0;
sqlite3_int64 t;
if( clockVfs==0 ) clockVfs = sqlite3_vfs_find(0);
if( clockVfs->iVersion>=1 && clockVfs->xCurrentTimeInt64!=0 ){
clockVfs->xCurrentTimeInt64(clockVfs, &t);
}else{
double r;
clockVfs->xCurrentTime(clockVfs, &r);
t = (sqlite3_int64)(r*86400000.0);
}
return t;
}
/* Print an error message and exit */
static void fatal_error(const char *zMsg, ...){
va_list ap;
va_start(ap, zMsg);
vfprintf(stderr, zMsg, ap);
va_end(ap);
exit(1);
}
/* Print a usage message and quit */
static void usage(void){
printf("%s",zHelp);
exit(0);
}
/* The sqlite3_trace() callback function */
static void traceCallback(void *NotUsed, const char *zSql){
printf("%s;\n", zSql);
}
/* An sqlite3_exec() callback that prints results on standard output,
** each column separated by a single space. */
static int printResult(void *NotUsed, int nArg, char **azArg, char **azNm){
int i;
printf("%s", zTag);
for(i=0; i<nArg; i++){
printf(" %s", azArg[i] ? azArg[i] : "(null)");
}
printf("\n");
return 0;
}
/*
** Add one character to a hash
*/
static void addCharToHash(unsigned int *a, unsigned char x){
if( a[0]<4 ){
a[1] = (a[1]<<8) | x;
a[0]++;
}else{
a[2] = (a[2]<<8) | x;
a[0]++;
if( a[0]==8 ){
a[3] += a[1] + a[4];
a[4] += a[2] + a[3];
a[0] = a[1] = a[2] = 0;
}
}
}
/*
** Compute the final hash value.
*/
static void finalHash(unsigned int *a, char *z){
a[3] += a[1] + a[4] + a[0];
a[4] += a[2] + a[3];
sqlite3_snprintf(17, z, "%08x%08x", a[3], a[4]);
}
/*
** Implementation of a checksum() aggregate SQL function
*/
static void checksumStep(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
const unsigned char *zVal;
int nVal, i, j;
unsigned int *a;
a = (unsigned*)sqlite3_aggregate_context(context, sizeof(unsigned int)*5);
if( a ){
for(i=0; i<argc; i++){
nVal = sqlite3_value_bytes(argv[i]);
zVal = (const unsigned char*)sqlite3_value_text(argv[i]);
if( zVal ) for(j=0; j<nVal; j++) addCharToHash(a, zVal[j]);
addCharToHash(a, '|');
}
addCharToHash(a, '\n');
}
}
static void checksumFinalize(sqlite3_context *context){
unsigned int *a;
char zResult[24];
a = sqlite3_aggregate_context(context, 0);
if( a ){
finalHash(a, zResult);
sqlite3_result_text(context, zResult, -1, SQLITE_TRANSIENT);
}
}
/* Define operating modes */
#define MODE_INSERT 0
#define MODE_REPLACE 1
#define MODE_SELECT 2
#define MODE_UPDATE 3
#define MODE_DELETE 4
#define MODE_QUERY 5
#define MODE_COUNT 6
#define MODE_ALL (-1)
/* Mode names */
static const char *azMode[] = {
"--insert",
"--replace",
"--select",
"--update",
"--delete",
"--query"
};
/*
** Determine if another iteration of the test is required. Return true
** if so. Return zero if all iterations have finished.
*/
static int allLoop(
int iMode, /* The selected test mode */
int *piLoopCnt, /* Iteration loop counter */
int *piMode2, /* The test mode to use on the next iteration */
int *pUseWithoutRowid /* Whether or not to use --without-rowid */
){
int i;
if( iMode!=MODE_ALL ){
if( *piLoopCnt ) return 0;
*piMode2 = iMode;
*piLoopCnt = 1;
return 1;
}
if( (*piLoopCnt)>=MODE_COUNT*2 ) return 0;
i = (*piLoopCnt)++;
*pUseWithoutRowid = i&1;
*piMode2 = i>>1;
return 1;
}
int main(int argc, char **argv){
const char *zFileToRead = 0; /* Input file. NULL for stdin */
const char *zDbName = 0; /* Name of the database file to create */
int useWithoutRowid = 0; /* True for --without-rowid */
int iMode = MODE_INSERT; /* One of MODE_xxxxx */
int iMode2; /* Mode to use for current --all iteration */
int iLoopCnt = 0; /* Which iteration when running --all */
int useNocase = 0; /* True for --nocase */
int doTrace = 0; /* True for --trace */
int showStats = 0; /* True for --stats */
int showSummary = 0; /* True for --summary */
int showTimer = 0; /* True for --timer */
int cacheSize = 0; /* Desired cache size. 0 means default */
int pageSize = 0; /* Desired page size. 0 means default */
int commitInterval = 0; /* How often to commit. 0 means never */
int noSync = 0; /* True for --nosync */
const char *zJMode = 0; /* Journal mode */
int nOp = 0; /* Operation counter */
int i, j; /* Loop counters */
sqlite3 *db; /* The SQLite database connection */
char *zSql; /* Constructed SQL statement */
sqlite3_stmt *pInsert = 0; /* The INSERT statement */
sqlite3_stmt *pUpdate = 0; /* The UPDATE statement */
sqlite3_stmt *pSelect = 0; /* The SELECT statement */
sqlite3_stmt *pDelete = 0; /* The DELETE statement */
FILE *in; /* The open input file */
int rc; /* Return code from an SQLite interface */
int iCur, iHiwtr; /* Statistics values, current and "highwater" */
FILE *pTimer = stderr; /* Output channel for the timer */
sqlite3_int64 sumCnt = 0; /* Sum in QUERY mode */
sqlite3_int64 startTime; /* Time of start */
sqlite3_int64 totalTime = 0; /* Total time */
char zInput[2000]; /* A single line of input */
/* Process command-line arguments */
for(i=1; i<argc; i++){
const char *z = argv[i];
if( z[0]=='-' ){
do{ z++; }while( z[0]=='-' );
if( strcmp(z,"without-rowid")==0 ){
useWithoutRowid = 1;
}else if( strcmp(z,"replace")==0 ){
iMode = MODE_REPLACE;
}else if( strcmp(z,"select")==0 ){
iMode = MODE_SELECT;
}else if( strcmp(z,"insert")==0 ){
iMode = MODE_INSERT;
}else if( strcmp(z,"update")==0 ){
iMode = MODE_UPDATE;
}else if( strcmp(z,"delete")==0 ){
iMode = MODE_DELETE;
}else if( strcmp(z,"query")==0 ){
iMode = MODE_QUERY;
}else if( strcmp(z,"all")==0 ){
iMode = MODE_ALL;
showTimer = -99;
}else if( strcmp(z,"nocase")==0 ){
useNocase = 1;
}else if( strcmp(z,"trace")==0 ){
doTrace = 1;
}else if( strcmp(z,"nosync")==0 ){
noSync = 1;
}else if( strcmp(z,"stats")==0 ){
showStats = 1;
}else if( strcmp(z,"summary")==0 ){
showSummary = 1;
}else if( strcmp(z,"timer")==0 ){
showTimer = i;
}else if( strcmp(z,"cachesize")==0 && i<argc-1 ){
i++;
cacheSize = atoi(argv[i]);
}else if( strcmp(z,"pagesize")==0 && i<argc-1 ){
i++;
pageSize = atoi(argv[i]);
}else if( strcmp(z,"commit")==0 && i<argc-1 ){
i++;
commitInterval = atoi(argv[i]);
}else if( strcmp(z,"journal")==0 && i<argc-1 ){
zJMode = argv[++i];
}else if( strcmp(z,"tag")==0 && i<argc-1 ){
zTag = argv[++i];
pTimer = stdout;
}else if( strcmp(z, "help")==0 || strcmp(z,"?")==0 ){
usage();
}else{
fatal_error("unknown option: \"%s\"\n"
"Use --help for a list of options\n",
argv[i]);
}
}else if( zDbName==0 ){
zDbName = argv[i];
}else if( zFileToRead==0 ){
zFileToRead = argv[i];
}else{
fatal_error("surplus argument: \"%s\"\n", argv[i]);
}
}
if( zDbName==0 ){
usage();
}
startTime = realTime();
/* Open the database and the input file */
if( zDbName[0] && strcmp(zDbName,":memory:")!=0 ){
unlink(zDbName);
}
if( sqlite3_open(zDbName, &db) ){
fatal_error("Cannot open database file: %s\n", zDbName);
}
if( zFileToRead ){
in = fopen(zFileToRead, "rb");
if( in==0 ){
fatal_error("Could not open input file \"%s\"\n", zFileToRead);
}
}else{
if( iMode==MODE_ALL ){
fatal_error("The --all mode cannot be used with stdin\n");
}
in = stdin;
}
/* Set database connection options */
if( doTrace ) sqlite3_trace(db, traceCallback, 0);
if( pageSize ){
zSql = sqlite3_mprintf("PRAGMA page_size=%d", pageSize);
sqlite3_exec(db, zSql, 0, 0, 0);
sqlite3_free(zSql);
}
if( cacheSize ){
zSql = sqlite3_mprintf("PRAGMA cache_size=%d", cacheSize);
sqlite3_exec(db, zSql, 0, 0, 0);
sqlite3_free(zSql);
}
if( noSync ) sqlite3_exec(db, "PRAGMA synchronous=OFF", 0, 0, 0);
if( zJMode ){
zSql = sqlite3_mprintf("PRAGMA journal_mode=%s", zJMode);
sqlite3_exec(db, zSql, 0, 0, 0);
sqlite3_free(zSql);
}
iLoopCnt = 0;
while( allLoop(iMode, &iLoopCnt, &iMode2, &useWithoutRowid) ){
/* Delete prior content in --all mode */
if( iMode==MODE_ALL ){
if( sqlite3_exec(db, "DROP TABLE IF EXISTS wordcount; VACUUM;",0,0,0) ){
fatal_error("Could not clean up prior iteration\n");
}
startTime = realTime();
rewind(in);
}
/* Construct the "wordcount" table into which to put the words */
if( sqlite3_exec(db, "BEGIN IMMEDIATE", 0, 0, 0) ){
fatal_error("Could not start a transaction\n");
}
zSql = sqlite3_mprintf(
"CREATE TABLE IF NOT EXISTS wordcount(\n"
" word TEXT PRIMARY KEY COLLATE %s,\n"
" cnt INTEGER\n"
")%s",
useNocase ? "nocase" : "binary",
useWithoutRowid ? " WITHOUT ROWID" : ""
);
if( zSql==0 ) fatal_error("out of memory\n");
rc = sqlite3_exec(db, zSql, 0, 0, 0);
if( rc ) fatal_error("Could not create the wordcount table: %s.\n",
sqlite3_errmsg(db));
sqlite3_free(zSql);
/* Prepare SQL statements that will be needed */
if( iMode2==MODE_QUERY ){
rc = sqlite3_prepare_v2(db,
"SELECT cnt FROM wordcount WHERE word=?1",
-1, &pSelect, 0);
if( rc ) fatal_error("Could not prepare the SELECT statement: %s\n",
sqlite3_errmsg(db));
}
if( iMode2==MODE_SELECT ){
rc = sqlite3_prepare_v2(db,
"SELECT 1 FROM wordcount WHERE word=?1",
-1, &pSelect, 0);
if( rc ) fatal_error("Could not prepare the SELECT statement: %s\n",
sqlite3_errmsg(db));
rc = sqlite3_prepare_v2(db,
"INSERT INTO wordcount(word,cnt) VALUES(?1,1)",
-1, &pInsert, 0);
if( rc ) fatal_error("Could not prepare the INSERT statement: %s\n",
sqlite3_errmsg(db));
}
if( iMode2==MODE_SELECT || iMode2==MODE_UPDATE || iMode2==MODE_INSERT ){
rc = sqlite3_prepare_v2(db,
"UPDATE wordcount SET cnt=cnt+1 WHERE word=?1",
-1, &pUpdate, 0);
if( rc ) fatal_error("Could not prepare the UPDATE statement: %s\n",
sqlite3_errmsg(db));
}
if( iMode2==MODE_INSERT ){
rc = sqlite3_prepare_v2(db,
"INSERT OR IGNORE INTO wordcount(word,cnt) VALUES(?1,1)",
-1, &pInsert, 0);
if( rc ) fatal_error("Could not prepare the INSERT statement: %s\n",
sqlite3_errmsg(db));
}
if( iMode2==MODE_UPDATE ){
rc = sqlite3_prepare_v2(db,
"INSERT OR IGNORE INTO wordcount(word,cnt) VALUES(?1,0)",
-1, &pInsert, 0);
if( rc ) fatal_error("Could not prepare the INSERT statement: %s\n",
sqlite3_errmsg(db));
}
if( iMode2==MODE_REPLACE ){
rc = sqlite3_prepare_v2(db,
"REPLACE INTO wordcount(word,cnt)"
"VALUES(?1,coalesce((SELECT cnt FROM wordcount WHERE word=?1),0)+1)",
-1, &pInsert, 0);
if( rc ) fatal_error("Could not prepare the REPLACE statement: %s\n",
sqlite3_errmsg(db));
}
if( iMode2==MODE_DELETE ){
rc = sqlite3_prepare_v2(db,
"DELETE FROM wordcount WHERE word=?1",
-1, &pDelete, 0);
if( rc ) fatal_error("Could not prepare the DELETE statement: %s\n",
sqlite3_errmsg(db));
}
/* Process the input file */
while( fgets(zInput, sizeof(zInput), in) ){
for(i=0; zInput[i]; i++){
if( !ISALPHA(zInput[i]) ) continue;
for(j=i+1; ISALPHA(zInput[j]); j++){}
/* Found a new word at zInput[i] that is j-i bytes long.
** Process it into the wordcount table. */
if( iMode2==MODE_DELETE ){
sqlite3_bind_text(pDelete, 1, zInput+i, j-i, SQLITE_STATIC);
if( sqlite3_step(pDelete)!=SQLITE_DONE ){
fatal_error("DELETE failed: %s\n", sqlite3_errmsg(db));
}
sqlite3_reset(pDelete);
}else if( iMode2==MODE_SELECT ){
sqlite3_bind_text(pSelect, 1, zInput+i, j-i, SQLITE_STATIC);
rc = sqlite3_step(pSelect);
sqlite3_reset(pSelect);
if( rc==SQLITE_ROW ){
sqlite3_bind_text(pUpdate, 1, zInput+i, j-i, SQLITE_STATIC);
if( sqlite3_step(pUpdate)!=SQLITE_DONE ){
fatal_error("UPDATE failed: %s\n", sqlite3_errmsg(db));
}
sqlite3_reset(pUpdate);
}else if( rc==SQLITE_DONE ){
sqlite3_bind_text(pInsert, 1, zInput+i, j-i, SQLITE_STATIC);
if( sqlite3_step(pInsert)!=SQLITE_DONE ){
fatal_error("Insert failed: %s\n", sqlite3_errmsg(db));
}
sqlite3_reset(pInsert);
}else{
fatal_error("SELECT failed: %s\n", sqlite3_errmsg(db));
}
}else if( iMode2==MODE_QUERY ){
sqlite3_bind_text(pSelect, 1, zInput+i, j-i, SQLITE_STATIC);
if( sqlite3_step(pSelect)==SQLITE_ROW ){
sumCnt += sqlite3_column_int64(pSelect, 0);
}
sqlite3_reset(pSelect);
}else{
sqlite3_bind_text(pInsert, 1, zInput+i, j-i, SQLITE_STATIC);
if( sqlite3_step(pInsert)!=SQLITE_DONE ){
fatal_error("INSERT failed: %s\n", sqlite3_errmsg(db));
}
sqlite3_reset(pInsert);
if( iMode2==MODE_UPDATE
|| (iMode2==MODE_INSERT && sqlite3_changes(db)==0)
){
sqlite3_bind_text(pUpdate, 1, zInput+i, j-i, SQLITE_STATIC);
if( sqlite3_step(pUpdate)!=SQLITE_DONE ){
fatal_error("UPDATE failed: %s\n", sqlite3_errmsg(db));
}
sqlite3_reset(pUpdate);
}
}
i = j-1;
/* Increment the operation counter. Do a COMMIT if it is time. */
nOp++;
if( commitInterval>0 && (nOp%commitInterval)==0 ){
sqlite3_exec(db, "COMMIT; BEGIN IMMEDIATE", 0, 0, 0);
}
}
}
sqlite3_exec(db, "COMMIT", 0, 0, 0);
sqlite3_finalize(pInsert); pInsert = 0;
sqlite3_finalize(pUpdate); pUpdate = 0;
sqlite3_finalize(pSelect); pSelect = 0;
sqlite3_finalize(pDelete); pDelete = 0;
if( iMode2==MODE_QUERY && iMode!=MODE_ALL ){
printf("%s sum of cnt: %lld\n", zTag, sumCnt);
rc = sqlite3_prepare_v2(db,"SELECT sum(cnt*cnt) FROM wordcount", -1,
&pSelect, 0);
if( rc==SQLITE_OK && sqlite3_step(pSelect)==SQLITE_ROW ){
printf("%s double-check: %lld\n", zTag,sqlite3_column_int64(pSelect,0));
}
sqlite3_finalize(pSelect);
}
if( showTimer ){
sqlite3_int64 elapseTime = realTime() - startTime;
totalTime += elapseTime;
fprintf(pTimer, "%3d.%03d wordcount", (int)(elapseTime/1000),
(int)(elapseTime%1000));
if( iMode==MODE_ALL ){
fprintf(pTimer, " %s%s\n", azMode[iMode2],
useWithoutRowid? " --without-rowid" : "");
}else{
for(i=1; i<argc; i++) if( i!=showTimer ) fprintf(pTimer," %s",argv[i]);
fprintf(pTimer, "\n");
}
}
if( showSummary ){
sqlite3_create_function(db, "checksum", -1, SQLITE_UTF8, 0,
0, checksumStep, checksumFinalize);
sqlite3_exec(db,
"SELECT 'count(*): ', count(*) FROM wordcount;\n"
"SELECT 'sum(cnt): ', sum(cnt) FROM wordcount;\n"
"SELECT 'max(cnt): ', max(cnt) FROM wordcount;\n"
"SELECT 'avg(cnt): ', avg(cnt) FROM wordcount;\n"
"SELECT 'sum(cnt=1):', sum(cnt=1) FROM wordcount;\n"
"SELECT 'top 10: ', group_concat(word, ', ') FROM "
"(SELECT word FROM wordcount ORDER BY cnt DESC, word LIMIT 10);\n"
"SELECT 'checksum: ', checksum(word, cnt) FROM "
"(SELECT word, cnt FROM wordcount ORDER BY word);\n"
"PRAGMA integrity_check;\n",
printResult, 0, 0);
}
} /* End the --all loop */
/* Close the input file after the last read */
if( zFileToRead ) fclose(in);
/* In --all mode, so the total time */
if( iMode==MODE_ALL && showTimer ){
fprintf(pTimer, "%3d.%03d wordcount --all\n", (int)(totalTime/1000),
(int)(totalTime%1000));
}
/* Database connection statistics printed after both prepared statements
** have been finalized */
if( showStats ){
sqlite3_db_status(db, SQLITE_DBSTATUS_LOOKASIDE_USED, &iCur, &iHiwtr, 0);
printf("%s Lookaside Slots Used: %d (max %d)\n", zTag, iCur,iHiwtr);
sqlite3_db_status(db, SQLITE_DBSTATUS_LOOKASIDE_HIT, &iCur, &iHiwtr, 0);
printf("%s Successful lookasides: %d\n", zTag, iHiwtr);
sqlite3_db_status(db, SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE, &iCur,&iHiwtr,0);
printf("%s Lookaside size faults: %d\n", zTag, iHiwtr);
sqlite3_db_status(db, SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL, &iCur,&iHiwtr,0);
printf("%s Lookaside OOM faults: %d\n", zTag, iHiwtr);
sqlite3_db_status(db, SQLITE_DBSTATUS_CACHE_USED, &iCur, &iHiwtr, 0);
printf("%s Pager Heap Usage: %d bytes\n", zTag, iCur);
sqlite3_db_status(db, SQLITE_DBSTATUS_CACHE_HIT, &iCur, &iHiwtr, 1);
printf("%s Page cache hits: %d\n", zTag, iCur);
sqlite3_db_status(db, SQLITE_DBSTATUS_CACHE_MISS, &iCur, &iHiwtr, 1);
printf("%s Page cache misses: %d\n", zTag, iCur);
sqlite3_db_status(db, SQLITE_DBSTATUS_CACHE_WRITE, &iCur, &iHiwtr, 1);
printf("%s Page cache writes: %d\n", zTag, iCur);
sqlite3_db_status(db, SQLITE_DBSTATUS_SCHEMA_USED, &iCur, &iHiwtr, 0);
printf("%s Schema Heap Usage: %d bytes\n", zTag, iCur);
sqlite3_db_status(db, SQLITE_DBSTATUS_STMT_USED, &iCur, &iHiwtr, 0);
printf("%s Statement Heap Usage: %d bytes\n", zTag, iCur);
}
sqlite3_close(db);
/* Global memory usage statistics printed after the database connection
** has closed. Memory usage should be zero at this point. */
if( showStats ){
sqlite3_status(SQLITE_STATUS_MEMORY_USED, &iCur, &iHiwtr, 0);
printf("%s Memory Used (bytes): %d (max %d)\n", zTag,iCur,iHiwtr);
sqlite3_status(SQLITE_STATUS_MALLOC_COUNT, &iCur, &iHiwtr, 0);
printf("%s Outstanding Allocations: %d (max %d)\n",zTag,iCur,iHiwtr);
sqlite3_status(SQLITE_STATUS_PAGECACHE_OVERFLOW, &iCur, &iHiwtr, 0);
printf("%s Pcache Overflow Bytes: %d (max %d)\n",zTag,iCur,iHiwtr);
sqlite3_status(SQLITE_STATUS_MALLOC_SIZE, &iCur, &iHiwtr, 0);
printf("%s Largest Allocation: %d bytes\n",zTag,iHiwtr);
sqlite3_status(SQLITE_STATUS_PAGECACHE_SIZE, &iCur, &iHiwtr, 0);
printf("%s Largest Pcache Allocation: %d bytes\n",zTag,iHiwtr);
}
return 0;
}
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