Oracle distributes the connection requests to rac nodes using a random algorithm.
Oracle使用随机算法把连接请求分发给rac节点。
The Oracle RAC physical configuration contains two nodes: rac-node1 and rac-node2.
OracleRAC物理配置包括两个节点：rac-node1和 rac-node2。
Oracle attempts to distribute the data block's ownership uniformly across all rac nodes.
Oracle尝试跨所有rac节点统一分发该数据块的所有权。
He explained that a large number of Spring developers use Oracle and in turn Oracle rac.
他说相当多的Spring开发者在使用Oracle，相应地也在使用Oraclerac。
Support has also been added for Highly Available (ha) databases, including DB2 HADR and Oracle rac.
还添加了对高可用性(HA)数据库(包括DB 2HADR和Oracle rac)的支持。
For each connection request, the Oracle JDBC driver randomly picks up a rac node for obtaining connections.
对于每个连接请求，OracleJDBC驱动程序将随机选择一个rac节点来获取连接。
The Oracle JDBC driver can be configured for failover or load balancing (or both) in an Oracle rac environment.
在Oraclerac环境中，可以将OracleJDBC驱动程序配置为用于故障转移或负载平衡(或者同时用于两者)。
Even if the Oracle nodes come back up, the Oracle DTP service will not return to the freshly restarted rac node.
即使Oracle节点恢复，OracleDTP服务也不会返回到刚刚重启的rac节点。
In an Oracle rac environment, every Oracle data block is assigned one (and only one) "Master" Oracle rac node.
在Oraclerac环境中，每个Oracle数据块都被赋予一个(且只有一个)“主”Oracle rac节点。
This implies that for URL (1) (in Listing 1), the URL of cluster-member1, rac-node1 is the primary RAC node.
这说明，对于URL (1)（在清单 1 中），cluster-member1的 URL (rac-node1)是 RAC主节点。
Here is an outline of the simplest strategy for avoiding the XA-related limitation of Oracle rac mentioned above.
下面简要介绍可以避免上述与xa相关的Oraclerac限制的最简单策略。
The Global Cache Service (GCS) of that Oracle rac node is responsible for managing access to these sets of data blocks.
该Oraclerac节点的全局缓存服务(GCS)负责管理对这些数据块集的访问。
On a request to obtain connections, the Oracle JDBC driver will provide physical connections from the running rac nodes.
在请求获取连接时，OracleJDBC驱动程序将从运行的rac节点提供物理连接。
If a rac node stops working, Oracle will not failover the DTP service until the Oracle rac cleanup and recovery is complete.
如果rac节点停止工作，Oracle需要在完成Oracle rac清理和恢复之后才能对DTP服务进行故障转移。
The Oracle JDBC driver always tries to obtain physical connections from the RAC node that occupies the first position in the list.
OracleJDBC驱动程序始终尝试从占据列表中第一位置的RAC节点获取物理连接。
If all connections in a global 2pc transaction originate from the same Oracle rac node, transaction recovery problems should not arise.
如果一个全局2pc事务中的所有连接都源自同一oraclerac节点，就不会出现事务恢复问题。
Specifying the load-balance or failover in the URL when Oracle services are used will not affect the rac nodes' load balance or failover.
在使用Oracle服务时在URL中指定负载平衡或故障转移不会影响rac节点的负载平衡或故障转移。
At 104,100 QphH@10TB, DB2 delivered 20% more performance compared to the Oracle 10g RAC result, even though DB2 used only half the number of CPUs.
在 104,100 QphH@10TB 中，即使DB2只使用一半数量的CPU，获得的性能仍然比Oracle 10gRAC结果的性能高出 20%。
Since the Oracle JDBC driver is not providing any load balancing, all of these inbound requests will open and use connections from the same rac node.
由于OracleJDBC驱动程序不提供任何负载平衡，所有这些入站请求都将打开并使用来自同一rac节点的连接。
However, to the WebSphere Application Server runtime, an Oracle rac is essentially just another database to be accessed using an appropriate JDBC driver.
不过，对于WebSphereApplicationServer运行时，Oraclerac本质上就是使用合适的JDBC驱动程序访问的另一数据库。
The Oracle database administrator (DBA) will consider many factors related to failover, load balancing, and others while creating and configuring an rac.
Oracle数据库管理员(DBA)在创建和配置rac时需要考虑与故障转移、负载平衡以及其他事项相关的诸多因素。
All the Oracle rac nodes will be the master of identical number of data blocks, if the number of rac nodes is a divisor of the number of Oracle data blocks.
如果Oraclerac节点数是Oracle数据块数的约数，则所有rac节点都是具有同样数量的数据块的主节点。
In addition to high availability, Oracle rac can also be configured to provide workload balancing; workload balance to the database happens at the connection level.
除高可用性外，还可以将Oraclerac配置为提供工作负载平衡；数据库的工作负载平衡在连接级别发生。
When the primary destination is not available, the database feature will direct the communication to the disaster data center (for example: DB2 HADR or Oracle RAC).
当主要目的地不可用时，此数据库功能会将通信定向到灾难数据库（例如：DB2HADR或Oracle RAC）。
Based on their interactions with these developers SpringSource has found that many are not taking advantage of rac features such as data types and fail over support.
在与这些开发者的交流中，SpringSource发现很多开发者都没有充分利用到RAC特性的优势，例如数据类型和失败转移的支持。
For example, if 100 database connection requests are made in a two-node Oracle rac environment, each rac node will be used to obtain approximately 50 database connections.
例如，如果在两节点的Oraclerac环境中进行100个数据库连接请求，则将使用每个rac节点来获取大约50个数据库连接。
Since failover is enabled, the Oracle JDBC driver will provide the connection from rac-node2 after recovery is done on the rac side (that is, Oracle rac is open for business).
由于支持故障转移，所以在rac端完成恢复后(即已为业务打开Oracle rac)，OracleJDBC驱动程序将从rac -node2提供连接。
The retry support in the Spring Batch project can be used to retry failing operations (for example, an operation that has failed on an individual cluster node in an Oracle rac).
SpringBatch项目中支持的重试可以用来重试失败的操作(例如，在Oraclerac中，一个在某一簇节点上已经失败的操作)。
Again, in this approach for using Oracle RAC in a WebSphere product, you have to simply specify the RAC-ified URL as the Oracle URL when defining the relevant Oracle JDBC data sources.
而且，在WebSphere产品中使用OracleRAC这一方法中，在定义相关的 OracleJDBC数据源时，您只需将 RAC-ifiedURL指定为 Oracle URL。
Proper RAC configuration for handling 2pc global transactions.
处理2pc全局事务的正确RAC配置。
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