testidx.cpp

实现内存数据库的源代码

//-< TESTPERF.CPP >--------------------------------------------------*--------*
// FastDB                    Version 1.0         (c) 1999  GARRET    *     ?  *
// (Main Memory Database Management System)                          *   /\|  *
//                                                                   *  /  \  *
//                          Created:     10-Feb-98    K.A. Knizhnik  * / [] \ *
//                          Last update: 10-Feb-99    K.A. Knizhnik  * GARRET *
//-------------------------------------------------------------------*--------*
// Test for index insert/search/delete operations
//-------------------------------------------------------------------*--------*

#include <stdio.h>
#include "fastdb.h"

const int nInsertedRecords = 10000000;
const int nRecords = 100000;
const int maxDuplicates = 256;

class Record { 
  public:
    nat8 key;

    TYPE_DESCRIPTOR((KEY(key, INDEXED) ));
};

REGISTER(Record);


int main() 
{
    dbDatabase db(dbDatabase::dbAllAccess, 4096); // 32Mb page pool
    if (db.open("testidx.dbs")) { 
	nat8 insKey = 1999;
	nat8 delKey = 1999;
	int8 key;
	dbQuery q;
	Record  rec;
	dbCursor<Record> cursor(dbCursorForUpdate);
	q = "key=",key;
	time_t start = time(NULL);
	for (int i = 0, j = 0, n = 0; i < nInsertedRecords;) { 
	    if (n >= nRecords) { 
		delKey = (3141592621u*delKey + 2718281829u) % 1000000007u;
		key = delKey;
		unsigned r = cursor.select(q);
		assert(r == ((unsigned)delKey % maxDuplicates) + 1);
		n -= r;
		cursor.removeAllSelected();
	    }		
	    insKey = (3141592621u*nat8(insKey) + 2718281829u) % 1000000007;
	    unsigned r = ((unsigned)insKey % maxDuplicates) + 1;
	    rec.key = insKey;
	    n += r;
	    i += r;
	    do { 
		insert(rec);
	    } while (--r != 0);
	    if (i > j) { 
		printf("Insert %d objects...\r", i);
		fflush(stdout);
		j = i + 1000;
	    }
	}
	printf("Elapsed time for %d record: %d seconds\n", 
	       nInsertedRecords, int(time(NULL) - start));
	db.close();
	return EXIT_SUCCESS;
    } else { 
	printf("Failed to open database\n");
	return EXIT_FAILURE;
    }
}