Performance verifying for Sqlite in-memory mode.

Performance verifying for Sqlite in-memory mode.

Testing environment:

Key-Value Map					List table(100 fields)
test case	bytes * times	Insert	Query		once a record and ( 50 * 100 )bytes every record	times	Insert	Query
100K bytes = bytes * times	10bytes * 10K	1.154s	1.825s			1K	0.187s	6.240s
	100bytes * 1K	0.109s	0.219s			100	0.015s	0.656s
	1K * 100	0.000s	0.016s			10	0.000s	0.063s
	10K * 10	0.000s	0.000s			5	0.000s	0.031s
1M bytes = bytes * times	10bytes * 100K	10.218s	18.736s			3	0.000s	0.016s
	100bytes * 10K	1.123s	2.028s			1	0.000s	0.000s
	1K * 1K	0.109s	0.266s
	10K * 100	0.016s	0.046s
	100K * 10	0.000s	0.000s
1K bytes * times	1K * 10	0.000s	0.000s
	1K * 100	0.000s	0.031s
	1K * 1K	0.140s	0.281s
	1K * 10K	1.108s	2.013s
	1K * 100K	11.637s	11.482s
10K bytes * times	10K * 10	0.000s	0.000s
	10K * 100	0.015s	0.016s
	10K * 1K	0.188s	0.296s
	10K * 10K	1.622s	2.745s
100K bytes * times	100K * 10	0.000s	0.015s
	100K * 100	0.078s	0.140s
	100K * 1K	0.499s	0.936s
	100K * 10K	5.788s	9.391s
1M bytes * times	1M * 10	0.031s	0.031s
	1M * 100	0.422s	0.280s
	1M * 1K	3.744s	2.746s
10M bytes * times	10M * 10	0.499s	0.312s
	10M * 100	4.649s	3.198s
100M bytes * times	100M * 1	0.577s	0.312s
	100M * 10	4.649s	3.292s