【数据库系统工程师201905】【5】令序列X、Y、Z的每个元素都按顺序进栈，且每个元素进栈和出栈仅一次，则不可能得到的出栈序列是（5）。

真题详情及解析

【数据库系统工程师201905】【4】某系统由3个部件构成，每个部件的千小时可靠度都为R，该系统的千小时可靠度为(1-(1-R)²)R，则该系统的构成方式是（4）。

真题详情及解析

【数据库系统工程师201905】【3】在计算机的存储系统中，（3）属于外存储器。

真题详情及解析

【数据库系统工程师201905】【2】DMA控制方式是在（2）之间直接建立数据通路进行数据的交换处理。

真题详情及解析

【数据库系统工程师201905】【1】计算机执行程序时，CPU中（1）的内容是一条指令的地址。

真题详情及解析

【数据库系统工程师201805】【71-75】A transaction is an action, or a series of actions, carried out by a single user or（71）, that accesses or changes the contents of database.
A transaction should possess the four basic or so-called ACID properties:
Atomicity,The “all or nothing” property, A transaction is an（72）unit that is either performed in its entirety or is not performed at all.
Consistency. A transaction must transform the database from one consistent state to another consistent state.
Isolation. Transactions execute independently of one another. In other words, the partial effects of （73）transactions should not be visible to other transactions.
Durability. The effects of successfully completed（committed） transaction are permanently recorded in the database and must not be lost because of subsequent failure.
The four properties above, only（74）property is the responsibility of the concurrency control subsystem to ensure. It is the responsibility of both the（75）and the application developers to ensure consistency. To guarantee the Atomicity and Durability properties after a failure, a log file is needed.

真题详情及解析

【数据库系统工程师201805】【71-75】A transaction is an action, or a series of actions, carried out by a single user or（71）, that accesses or changes the contents of database.
A transaction should possess the four basic or so-called ACID properties:
Atomicity,The “all or nothing” property, A transaction is an（72）unit that is either performed in its entirety or is not performed at all.
Consistency. A transaction must transform the database from one consistent state to another consistent state.
Isolation. Transactions execute independently of one another. In other words, the partial effects of （73）transactions should not be visible to other transactions.
Durability. The effects of successfully completed（committed） transaction are permanently recorded in the database and must not be lost because of subsequent failure.
The four properties above, only（74）property is the responsibility of the concurrency control subsystem to ensure. It is the responsibility of both the（75）and the application developers to ensure consistency. To guarantee the Atomicity and Durability properties after a failure, a log file is needed.

真题详情及解析

【数据库系统工程师201805】【71-75】A transaction is an action, or a series of actions, carried out by a single user or（71）, that accesses or changes the contents of database.
A transaction should possess the four basic or so-called ACID properties:
Atomicity,The “all or nothing” property, A transaction is an（72）unit that is either performed in its entirety or is not performed at all.
Consistency. A transaction must transform the database from one consistent state to another consistent state.
Isolation. Transactions execute independently of one another. In other words, the partial effects of （73）transactions should not be visible to other transactions.
Durability. The effects of successfully completed（committed） transaction are permanently recorded in the database and must not be lost because of subsequent failure.
The four properties above, only（74）property is the responsibility of the concurrency control subsystem to ensure. It is the responsibility of both the（75）and the application developers to ensure consistency. To guarantee the Atomicity and Durability properties after a failure, a log file is needed.

真题详情及解析

【数据库系统工程师201805】【71-75】A transaction is an action, or a series of actions, carried out by a single user or（71）, that accesses or changes the contents of database.
A transaction should possess the four basic or so-called ACID properties:
Atomicity,The “all or nothing” property, A transaction is an（72）unit that is either performed in its entirety or is not performed at all.
Consistency. A transaction must transform the database from one consistent state to another consistent state.
Isolation. Transactions execute independently of one another. In other words, the partial effects of （73）transactions should not be visible to other transactions.
Durability. The effects of successfully completed（committed） transaction are permanently recorded in the database and must not be lost because of subsequent failure.
The four properties above, only（74）property is the responsibility of the concurrency control subsystem to ensure. It is the responsibility of both the（75）and the application developers to ensure consistency. To guarantee the Atomicity and Durability properties after a failure, a log file is needed.

真题详情及解析

【数据库系统工程师201805】【71-75】A transaction is an action, or a series of actions, carried out by a single user or（71）, that accesses or changes the contents of database.
A transaction should possess the four basic or so-called ACID properties:
Atomicity,The “all or nothing” property, A transaction is an（72）unit that is either performed in its entirety or is not performed at all.
Consistency. A transaction must transform the database from one consistent state to another consistent state.
Isolation. Transactions execute independently of one another. In other words, the partial effects of （73）transactions should not be visible to other transactions.
Durability. The effects of successfully completed（committed） transaction are permanently recorded in the database and must not be lost because of subsequent failure.
The four properties above, only（74）property is the responsibility of the concurrency control subsystem to ensure. It is the responsibility of both the（75）and the application developers to ensure consistency. To guarantee the Atomicity and Durability properties after a failure, a log file is needed.

真题详情及解析