In Oracle ASM (Automatic Storage Management), the terms "cold space" and "hot space" refer to the patterns of data access within the storage disks managed by ASM.
Hot Space: This is the area of the disk where data is frequently accessed. This section often contains data that is actively used or queried, such as recent transactional data in a database. Storing frequently accessed data in faster, more accessible parts of the disk can help improve performance.
Cold Space: Conversely, cold space refers to the parts of the disk where data is infrequently accessed. This area might contain archival or historical data that does not need to be accessed as often. This data can be stored on slower or less accessible parts of the disk, as its performance impact is minimal.
Cold Space vs Free Space in ASM:
Cold Space refers to areas where data is rarely accessed but still occupies space.
Free Space, on the other hand, refers to areas of the disk that are unallocated and available for storing data. This space doesn’t currently hold any data and can be used for new data or to expand existing datasets.
Therefore, cold space and free space in ASM are not the same. Cold space contains data, albeit infrequently accessed, while free space is entirely unoccupied and available for use.
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