(DI-2211) Collector for HANA Save Point performance

The technical name of the Collector for HANA Save Point performance is /DVD/MON_HDB_CL_COL_SP.

This collector collects information about Save Point performance according to the view M_SAVEPOINTS. During a save point, the database system writes data that has changed since the last save point from the data cache (working memory) to the data area (permanent storage). The data written during a save point always represents a consistent state of the database. During a save point, the database system does not overwrite the pages written to the data area at the previous save point, but instead writes the changed data to free positions. This is because the database system requires this information from the previous save point for a restart to check if there is a system failure during the new save point. Only after the database system has successfully completed the new save point, does it release the pages of the old save point in the data area for overwriting. To perform a save point write operation, SAP HANA needs to take a global database lock. This period is called the critical phase of a save point.

Default KPIs delivered with this collector

The following default KPIs are delivered with this collector:

KPI name

Description

Unit

Collected for

Server specification

KPI name

Description

Unit

Collected for

Server specification

HDB_SP_COUNT

Number of save points

Count

System

Any server

HDB_SP_LAST

Time since the last save point

S

System

Any server

HDB_SP_MAXRUN

Max. duration of a save point

S

System

Any server

HDB_SP_MAXRUN_C

Max. critical phase duration of a save point

S

System

Any server

HDB_SP_SPEED

Save point speed

MB/s

System

Any server

Detail Table:

The collector provides a detail table for HANA Savepoint Critical Time. The technical name of the detail table is /DVD/MON_HDB_S_SP_CRIT.

Its shows a histogram of critical HANA save point time grouped by time-based on how long was their critical time. It has the following fields:

Technical Name

Short Description

Description

Technical Name

Short Description

Description

TIME

HANA Savepoint Time

Time of aggregation in format ‘YYYY-MM-DD HH:MM’

LESS1S

HANA Critical Savepoint Less than 1 second

Number of savepoints that had critical time less than 1 second

LESS2S

HANA Critical Savepoint Less than 2 seconds

Number of savepoints that had critical time less than 2 seconds

LESS3S

HANA Critical Savepoint Less than 3 seconds

Number of savepoints that had critical time less than 3 seconds

LESS4S

HANA Critical Savepoint Less than 4 seconds

Number of savepoints that had critical time less than 4 seconds

LESS5S

HANA Critical Savepoint Less than 5 seconds

Number of savepoints that had critical time less than 5 seconds

LESS10S

HANA Critical Savepoint Less than 10 seconds

Number of savepoints that had critical time less than 10 seconds

LESS20S

HANA Critical Savepoint Less than 20 seconds

Number of savepoints that had critical time less than 20 seconds

LESS40S

HANA Critical Savepoint Less than 40 seconds

Number of savepoints that had critical time less than 40 seconds

LESS60S

HANA Critical Savepoint Less than 60 seconds

Number of savepoints that had critical time less than 60 seconds

MORE60S

HANA Critical Savepoint More than 60 seconds

Number of savepoints that had critical time of more than 60 seconds

TOTAL

HANA Total number of savepoints with critical time

Total number of save points