org.apache.derby.iapi.store.access.ScanController#getScanInfo()
| Modifier and Type | Field and Description |
|---|---|
| private int | |
| private int | stat_numpages_visited
Performance counters ... |
| private int | |
| private int | |
| private FormatableBitSet |
| Access | Constructor and Description |
|---|---|
| pack-priv |
| Modifier and Type | Method and Description |
|---|---|
| public Properties | getAllScanInfo(Properties
Property list to fill in. prop)Implements org. Return all information gathered about the scan. |
| stat_numColumnsFetched | back to summary |
|---|---|
| private int stat_numColumnsFetched | |
| stat_numpages_visited | back to summary |
|---|---|
| private int stat_numpages_visited Performance counters ... | |
| stat_numrows_qualified | back to summary |
|---|---|
| private int stat_numrows_qualified | |
| stat_numrows_visited | back to summary |
|---|---|
| private int stat_numrows_visited | |
| stat_validColumns | back to summary |
|---|---|
| private FormatableBitSet stat_validColumns | |
| HeapScanInfo | back to summary |
|---|---|
| pack-priv HeapScanInfo(HeapScan scan) | |
| getAllScanInfo | back to summary |
|---|---|
| public Properties getAllScanInfo(Properties prop) throws StandardException Implements org. Return all information gathered about the scan. This routine returns a list of properties which contains all information gathered about the scan. If a Property is passed in, then that property list is appeneded to, otherwise a new property object is created and returned. Not all scans may support all properties, if the property is not supported then it will not be returned. The following is a list of properties that may be returned: numPagesVisited - the number of pages visited during the scan. For btree scans this number only includes the leaf pages visited. numRowsVisited - the number of rows visited during the scan. This number includes all rows, including: those marked deleted, those that don't meet qualification, ... numRowsQualified - the number of undeleted rows, which met the qualification. treeHeight (btree's only) - for btree's the height of the tree. A tree with one page has a height of 1. Total number of pages visited in a btree scan is (treeHeight - 1 + numPagesVisited). NOTE - this list will be expanded as more information about the scan is gathered and returned.
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