因而，读操作与日志写和缓冲池中的数据页的写操作之间存在竞争。
Thus, the read operations compete with log writing and the write operation for data pages from the buffer pool.
执行操作通常会导致读、写或修改一个或多个持久性数据。
Execution of an operation will typically cause one or more persistent data records to be read, written, or modified.
rw参数，使用它指明预抓取数据是为了执行读操作，还是执行写操作。
The rw parameter, which you use to indicate whether the data is being pulled in for Read or preparing for a Write operation.
如果没有分帧机制，一端接收到的数据可能比另外一端发送的数据多或少(这会将一次写操作划分成多次操作，或者将多次写操作合并到一个读操作中)。
Without framing, a peer may receive more or less than was sent (splitting up a write or aggregating multiple writes into a single read).
该解决方案使用与RAID文件服务器相同的技术，允许整个ZEO数据库集群以冗余的方式操作，并且所有服务器都参与读和写。
It USES the same techniques as a RAID file server to allow an entire cluster of ZEO databases to operate redundantly, with all servers participating in both reads and writes.
每个成员可以同时访问相同的数据库，包括读和写操作。
Each member can simultaneously access the same database for both read and write operations.
将分割镜像初始化为快照时，将执行崩溃恢复，回滚所有未提交的事务，并使数据库可以被所有读或写操作访问。
The initialization of the split mirror as snapshot performs a crash recovery, rolls back all uncommitted transactions, and makes the database available for any read or write operation.
但是，假若我们想全部利用IOCP服务器的潜力，我们应该有很多的异步读操作等待数据的到达。
But if we want to use the IOCP server's full potential, we should have several pending asynchronous reads waiting for data to arrive.
其他想要并发访问相同表中的数据的应用程序不需要与数据库断开连接，并且可以继续进行该表中的读或写操作。
Other applications that want to access data in the same table concurrently do not need to disconnect from the database, and are free to pursue read or write operations in that table.
通过使用乐观并发控制，数据库管理器在完成读操作之后可以立即释放行或页锁。
With optimistic concurrency control, the database manager releases the row or page locks immediately after a read operation.
只有部分数据副本参与更新操作，且/或作为读操作的一部分与其它副本进行联系时，就会出现弱/最终一致性。
Weak/eventual consistency happens when not all data replicas participate in the update operation and/or contacted as part of read operation.
在读事务中，没有变更需要提交，但是事务会防止对正在被读取的数据的修改，直到所有的读操作全部结束。
In a read transaction, there are no changes to commit, but the transaction prevents the data being read from changing until all of the reads are complete.
在数据库读操作成功之后，它循环遍历结果集并收集帐户数据信息。
After a successful database read operation, it iterates on the result set and collects the individual account data information.
事务再次读取某数据时发现它自最后一次读操作之后由于另一个事务修改并提交了该数据而发生了更改，则会发生不可重读。
An unrepeatable read can occur when the transaction reads some data again and finds that it changed since the last read due to another transaction that modified this data and committed.
他们没有建立严格的事务规则，而是把数据库表推到最简，索引只用来引用，发生实际的数据库读操作的时候才施加数据过滤。
Instead of a strict transaction protocol, they made the database tables canonical and used the indexes only for references and reapplied filters to the actual database reads.
操作系统调度程序决定哪个线程获得对互斥锁的控制权—通常，等待时间最长的读线程先读取数据。
The operating system scheduler determines which thread gets control of the mutex next-typically, the reader thread that has waited the longest gets to read the data first.
我在此处假设读操作(作为api层的入口点)不会对数据库调用写操作。
I am making the assumption here that the read operation (as an entry point to the API layer) is not in turn invoking write operations on the database.
这个隔离级只有当一个事务对同样的数据进行两次读操作而其他事务修改了两次读操作之间的数据，从而导致了每个读操作的结果不同时才会发生。
This happens when a transaction reads the same data twice, while another transaction modifies the data between the two reads, resulting in in a different result for each read.
DPF对于以读操作为主的工作负载很有用，包括数据仓库环境中常见的工作负载。
DPF can be useful for read-intensive workloads, including those common to data warehouse environments.
OpenLDAP软件和包提供了创建目录信息树（一个主要进行读操作的数据库）的工具。
The OpenLDAP software and the packages it interfaces with provide tools to create a Directory Information Tree, a read-mostly database.
Realm写操作：目前所有Realm实现都支持“读”操作来获取验证和授权数据以执行登录和访问控制。
Realm Write operations: Currently all Realm implementations support 'read' operations for acquiring authentication and authorization data to perform logins and access control.
当用户读数据时(SELECT、UPDATE和DELETE操作)，则应用读访问规则，读访问规则可总结如下。
The read access rules are applied when data is read (SELECT, UPDATE, and DELETE operations) and can be summarized as follows.
从纯数据的角度来看，eBay可以被描述为具有大量的读、写操作，但对容错性和一致性的要求非常严格。
From a pure data perspective, eBay can be described as having a huge number of frequent writes, as well as reads, with an extremely low tolerance for error or inconsistency.
读、写数据页是普通的操作，因为执行代码通常与含可执行代码的页面相关联。
Read and write are common operations on data pages, while executing code is commonly associated with a page containing executable code.
新增了一个名为协调数据结构(Coordination Data Sructures)的API，用于在多个进程中处理同步问题并协调读操作和写操作。
A new API named Coordination Data Structures which synchronizes and coordinates reads and writes from multiple processes.
读操作的数据必须结束或者截断，否则不能发送写指令。
Data from READ burst must be completed or truncated before a subsequent WRITE command can be issued.
通过定义主从机读操作的两次握手命令-应答帧格式及其参数改写子VI实现数据采集。
Data acquisition was realized by defined two times of handshake order or response frame format and VI of read-write operation between host and slave computers.
用C51程序设置对于控制器的读、写状态的时序，从而实现对于控制器的写指令代码、写数据代码、清屏幕、屏幕滚动功能的操作。
C51 program has been set the schedule of reading and writing status for controller. It can work out some operations of writing instruction code, writing data code, clear screen and roll screen.
LDAP是一种轻量级的目录访问协议，它对数据的读操作进行了优化，非常适合用于像网格服务这种频繁读取数据的资源管理系统。
LDAP is a kind of light directory access protocol, which optimizes the data-read operation. It is suitable for the resource management in grid service that requires frequent reading operations.
LDAP是一种轻量级的目录访问协议，它对数据的读操作进行了优化，非常适合用于像网格服务这种频繁读取数据的资源管理系统。
LDAP is a kind of light directory access protocol, which optimizes the data-read operation. It is suitable for the resource management in grid service that requires frequent reading operations.
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