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MCOL-5021 Add an option in Columnstore.xml, fastdelete (disabled

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by default), which when enabled, indiscriminately invalidates all
column extents and performs the actual DELETE only on the AUX
column. The trade-off with this approach would now be that the
first SELECT for certain query patterns (those containing a WHERE
predicate) after the DELETE operation will slow down as the
invalidated column extent would need to be scanned again to set
the min/max values.
This commit is contained in:
Gagan Goel
2022-05-26 15:13:19 -04:00
parent 2280b1dd25
commit c8b6b154bf
6 changed files with 96 additions and 32 deletions
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9
writeengine/shared/we_config.h
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@ -122,6 +122,14 @@ class Config
*/
EXPORT static std::string getBulkRollbackDir();
/**
* @brief MCOL-5021 Option to enable/disable fast deletes.
* When enabled (option is disabled by default),
* all column extents are indiscriminately invalidated
* and actual delete is only performed on the AUX column.
*/
EXPORT static bool getFastDelete();
/**
* @brief Max percentage of allowable file system disk usage for each DBRoot
*/
@ -187,6 +195,7 @@ class Config
static unsigned m_ExtentsPerSegmentFile; // # extents per segment file
static int m_BulkProcessPriority; // cpimport.bin proc priority
static std::string m_BulkRollbackDir; // bulk rollback meta data dir
static bool m_FastDelete; // fast delete option
static unsigned m_MaxFileSystemDiskUsage; // max file system % disk usage
static unsigned m_NumCompressedPadBlks; // num blks to pad comp chunks
static bool m_ParentOAMModuleFlag; // are we running on parent PM