Examples with "buffer cache of another instance" and their translation in Japans
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If accessing a database block of any class does not locate a buffered copy in the local cache, a global cache operation is initiated. Before reading a block from disk, an attempt is made to find the block in the buffer cache of another instance. If the block is in another instance, a version of the block may be shipped. Two different types of blocks are distinguished: current and consistent read blocks.
When a process attempts to access a data block, it first tries to locate a copy of the data block in the local buffer cache. If a copy of the data block is not found in the local buffer cache, a global cache operation is initiated. Before reading a data block from disk, the process attempts to find the data block in the buffer cache of another instance. If the data block is in the buffer cache of another instance, Cache Fusion transfers a version of the data block to the local buffer cache, rather than having one database instance write the data block to disk and requiring the other instance to reread the data block from disk. For example, after the sales1 instance loads a data block into its buffer cache, the sales2 instance can more quickly acquire the data block from the sales1 instance by using Cache Fusion rather than by reading the data block from disk.
If a logical read fails to find a copy of the buffer in the local cache, it attempts to find the buffer in the database cache of a remote instance. If the block is present in another database, it is sent to the current instance. This graph shows the amount of blocks received.
Cache Fusion enhances the performance of Oracle RAC by utilizing a high-speed interconnect to send data blocks to another instance's buffer cache. The high-speed interconnect should be a private network with the highest bandwidth to maximize performance.
The global cache block transfer rate shows the total aggregated number of data blocks received by all instances in the cluster by way of an interconnect. If a logical read fails to find a copy of the buffer in the local cache, it attempts to find the buffer in the database cache of a remote instance. If the block is present in another database, it is sent to the current instance.
≪グローバル・キャッシュ・ブロック転送率|Global Cache Block Transfer Rate|emdw≫は、インターコネクト経由でクラスタ内のすべてのインスタンスにより受信されたデータ・ブロックの全集計数を示します。論理読取りでローカル・キャッシュ内にバッファのコピーが検出されないと、リモート・インスタンスのデータベース・キャッシュでバッファの検索が行われます。そのブロックが別のデータベースに存在する場合は、現在のインスタンスに送信されます。
Each database instance in an Oracle RAC database uses its own memory structures and background processes. Oracle RAC uses Cache Fusion to synchronize the data stored in the buffer cache of each database instance. Cache Fusion moves current data blocks (which reside in memory) between database instances, rather than having one database instance write the data blocks to disk and requiring another database instance to reread the data blocks from disk. When a data block located in the buffer cache of one instance is required by another instance, Cache Fusion transfers the data block directly between the instances using the interconnect, enabling the Oracle RAC database to access and modify data as if the data resided in a single buffer cache.
Alternatively, you can give a pre-filled dictionary (copied from another instance of the same kind of cache) to start cache with some data already in it.
Shows the percentage of logical read operations that retrieved data from the buffer cache of other instances by way of Direct Memory Access and from disk. It is essentially a profile of how much work is performed in the local buffer cache, rather than the portion of remote references and physical reads, which both have higher latencies.
Data block reads issued from the instance. These are data file reads issued by foregrounds to read the blocks into buffer cache or data file reads by foregrounds for direct reads (query operations).
Data block writes issued from the instance. This includes data block writes issued by the database writer (dbwr) process from buffer cache and writes issued by foregrounds as part of direct load operations.
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