存储引擎-存储结构之一:行
周未电影推荐: 《小时代》:讲述 四位女生 步入社会所面临的各种情感,生存问题。播放地址: SQLServer中,数据的存储是按记录行来存储的,每一行包含数据的所有的列,这样的存储,是非常有利数据的查询的, 但也正因为如此,LOB页,行溢出页,表结构修改都
周未电影推荐:
《小时代》:讲述四位女生步入社会所面临的各种情感,网站空间,生存问题。播放地址:
SQLServer中,数据的存储是按记录行来存储的,香港服务器,每一行包含数据的所有的列,这样的存储,是非常有利数据的查询的,香港服务器租用,
但也正因为如此,LOB页,行溢出页,表结构修改都极易产生空洞,形成磁盘碎片。
我们做个例子分析下:
测试范围->没有聚集索引,没有非聚集索引,含有定长列和变长列的堆
create table t_test
(
col1 int,
col2 varchar(10),
col3 datetime,
col4 char(10),
col5 nvarchar(4)
)
t_test ,,,N)
,,N)
t_test
DBCC IND(test,t_test,1)
DBCC TRACEON(3604)
,1,1456,1)
/*
Slot 0, Offset 0x60, Length 44, DumpStyle BYTE
Record Type = PRIMARY_RECORD Record Attributes = NULL_BITMAP VARIABLE_COLUMNS
Record Size = 44
Memory Dump @0x000000000FFEA060
0000000000000000: 30001a00 01000000 00000000 3a9d0000 †0...........:...
0000000000000010: 31323320 20202020 20200500 00020026 †123 .....&
0000000000000020: 002c0041 42436100 62006300 ††††††††††.,.ABCa.b.c.
*/

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