2751675 - Why do HANA Database systems use 4 or 5 (/1LT/* or /1DH/*) triggers? - SLT / ABAP CDC Engine

• Why do HANA Database systems use 4 or 5 (/1LT/* or /1DH/*) triggers?
• Why are there 4 or 5 triggers rather than 3 triggers for each source table?
• Why is there an UPD1 and UPD2 trigger (and UPD3 trigger)?
• Why does an update to a keyfield result in two logging table records (1 record for delete and 1 record for insert)?
• Why can a single update or upsert to a record result in multiple update triggers firing?

• SAP Landscape Transformation Replication Server (/1LT/* or /1DH/* triggers)
  AND/OR
• ABAP CDC engine (/1DH/* triggers).

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