摘要: 事務(wù)（transaction）是數(shù)據(jù)庫管理系統(tǒng)的執(zhí)行單位，可以是一個數(shù)據(jù)庫操作（如Select操作）或者是一組操作序列。事務(wù)ACID屬性，即原子性（Atomicity）、一致性(Consistency)、隔離性（Isolation）、持久性（Durability）。
閱讀全文
摘要: solidDB? can store binary and character data up to 2147483647 (2G - 1) bytes long. When such data exceeds a certain length, the data is called a BLOB (Binary Large OBject) or CLOB (Character Large OBject), depending upon the data type that stores the information. CLOBS contain only "plain text" and can be stored in any of the following data types:
閱讀全文