Access数据库的存储上限
Access数据库的存储上限
数据库属性 最大值
Microsoft Access 数据库 (.mdb) 文件大小 2G 字节减去系统对象所需的空间。
数据库中的对象个数 32,768
模块（包括“内含模块”属性为“是”的窗体和报表） 1,000
对象名称中的字符数 64
密码的字符个数 14
用户名或组名的字符个数 20
并发用户的个数 255
表
属性 最大值
表名的字符个数 64
字段名的字符个数 64
表中字段的个数 255
打开表的个数 2048；实际可打开的表的数目可能会少一些，因为 Microsoft Access 还要打开一些内部的表。
表的大小 2G 字节减去系统对象所需的空间
“文本”字段的字符个数 255
“备注”字段的字符个数 通过用户界面输入为 65,535；以编程方式输入时为 1G 字节的字符存储。
“OLE 对象”字段的大小 1G 字节
表中的索引个数 32
索引中的字段个数 10
有效性消息的字符个数 255
有效性规则的字符个数 2,048
表或字段说明的字符个数 255
记录的字符个数（除“备注”字段和“OLE 对象”字段外） 2,000
字段属性设置的字符个数 255
查询
属性 最大值
实施关系的个数 每个表为 32 减去表中不包含在关系中的字段或字段组合的索引个数
查询中的表的个数 32
记录集中的字段个数 255
记录集大小 1G 字节
排序限制 255 个字符（一个或一个以上字段）
嵌套查询的层次数 50
查询设计网格一个单元格中的字符个数 1,024
参数查询的参数字符个数 255
Where 或 HAVING 子句中 AND 的个数 99
SQL 语句中的字符个数 约为 64,000
窗体和报表
属性 最笾?br />标签中的字符个数 2,048
文本框中的字符个数 65,535
窗体或报表宽度 22 英寸（55.87 厘米）
节高度 22 英寸（55.87 厘米）
所有节加上节页眉的高度（在“设计”视图中） 200 英寸（508 厘米）
窗体或报表的最大嵌套层数 7
报表中可作为排序或分组依据的字段或表达式个数 10
报表中页眉和页脚的个数 1 对报表页眉/报表页脚，1 对页面页眉/页面页脚，10 对组页眉/组页脚
报表的打印页数 65,536
可添加到窗体或报表的控件和节的个数 754
SQL 语句中作为窗体、报表或控件的“记录源”或“行来源”属性的字符个数（适用于 .mdb 和 .adp） 32,750
宏
属性 最大值
宏中的操作个数 999
条件中的字符个数 255
备注中的字符个数 255
操作参数中的字符个数 255
Microsoft Access 项目规格
Access 项目
属性 最大值
Microsoft Access 项目 (.adp) 中的对象数目 32,768
模块（包括“内含模块”属性为“是”的窗体和报表） 1,000
对象名称中的字符数 64
表中的索引个数 250 (Microsoft SQL Server 6.5)
1024（Microsoft SQL Server 7.0 和 2000）
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