Note: Oracle In-Memory is available for Oracle 12c Release 1 (12.1.0.2) and above. Data is displayed for Oracle instances where In-Memory is available and has been enabled. In-Memory is disabled by default.
Drilldown on the In-Memory segments consuming the most I/O and disk resources. Assess the time saved by having the segment In-Memory and use this information to determine whether it is worth having the segment in memory.
To open the Segments page
Click Configuration & Memory | In-Memory Page | Segments Page.
Top Segments by In-Memory Scans
Show the memory segments of in-memory tables. Show the segments with the most In-Memory scans (Top 100) in descending order of magnitude.
Column | Description | ||||||||||||
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Name | The name of the segment. Invariably this segment will be of type table. | ||||||||||||
Owner | The owner of the segment. | ||||||||||||
Populate Status | The status of populating the segment. The status is started, completed or failed. | ||||||||||||
IM Distribute |
Applicable in the case of an Oracle RAC. The DISTRIBUTE clause controls how table data in the In-Memory column store is distributed across Oracle RAC instances.
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IM Duplicate |
Applicable in the case of an Oracle RAC. The DUPLICATE clause controls how table data in the In-Memory column store is duplicated across Oracle RAC instances.
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IM Compression |
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IM Priority |
The priority determines the order in which segments are populated in the In-Memory column store.
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Size on Disk (Mbytes) | The size of the segment on disk. | ||||||||||||
IM Size (Mbytes) | The size of the segment in the In-Memory column store. | ||||||||||||
Bytes not Populated (Mbytes) | The size of the portion of the on-disk segment that is not populated in memory. | ||||||||||||
Logical Reads | The number of logical reads on the segment. | ||||||||||||
DB Block Changes | The number of DB block changes on the segment. | ||||||||||||
Number of Indexes | The number of indexes in the segment (table). | ||||||||||||
IM Scans | The number of In-Memory scans on the segment. | ||||||||||||
Physical Reads | The number of physical reads on the segment. Physical reads are read from disk. | ||||||||||||
Container Name |
The name of the container for the pluggable database. |
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