We konden deze vermelding niet vinden. Er worden benaderende resultaten weergegeven. Controleer je spelling of stel voor deze term aan het woordenboek toe te voegen.
データベース・バッファ・キャッシュ
The first time an Oracle user process requires a particular piece of data, it searches for the data in the database buffer cache. If the process finds the data already in the cache (a cache hit), it can read the data directly from memory. If the process cannot find the data in the cache (a cache miss), it must copy the data block from a datafile on disk into a buffer in the cache before accessing the data. Accessing data through a cache hit is faster than data accessed through a cache miss.
When a buffer in the database buffer cache is modified, it is marked dirty. The primary job of the DBWn process is to keep the buffer cache clean by writing dirty buffers to disk. As user processes dirty buffers, the number of free buffers diminishes. If the number of free buffers drops too low, user processes that must read blocks from disk into the cache are not able to find free buffers. DBWn manages the buffer cache so that user processes can always find free buffers.
The database writer process (DBWn) writes the contents of buffers to DBWn processes are responsible for writing modified (dirty) buffers in the database buffer cache to disk.
This metric represents the number of disk reads per transaction during the sample period. When a user performs a SQL query, Oracle tries to retrieve the data from the database buffer cache (memory) first, then goes to disk if it is not in memory already. Reading data blocks from disk is much more expensive than reading the data blocks from memory. The goal with Oracle should always be to maximize memory utilization.
The database writer writes modified blocks from the database buffer cache to the files on disk. Oracle Database allows a maximum of 20 database writer processes.
Enter the size in bytes for the database buffer cache. This is the portion of the SGA that holds copies of data blocks read from data files.The initialization parameter specifies the number of buffers in the database buffer cache.
Er worden alleen voorbeelden gegeven om u te helpen het woord of de woordcombinatie waarop u hebt gezocht, te vertalen. Deze worden niet door ons geselecteerd of gevalideerd en kunnen ongepaste taal bevatten. Wij vragen u melding te maken van voorbeelden die dienen te worden aangepast of verwijderd. Vertalingen met grof of informeel taalgebruik worden meestal rood of oranje gemarkeerd.
Er zijn geen resultaten gevonden voor deze term.
Synoniemen voor database buffer cache in het Engels