HANA tables

HANA tables

Purpose

To monitor table statistics is useful to detect potential performance or optimization problems. 
This monitor will check for the number of records and delta records as well as memory and disk usage of the column store tables.

Configuration hints

Add a new rule in the surveillance table to start monitoring tables.
You can customize the thresholds and severities per schema and table name using the schema and table filters.

You can set threshold for the following metrics:
- The number of records
- The number of delta records (not persistently written).
- The amount of delta memory (space used by delta records)
- The disk space used by the table The monitoring can be customized based on filter set on the schema, the table and the type of table (partitioned or not)

Also, you must set at least one threshold if you want metrics to be sent.

Metrics: Caution

If a “*” is used as table name filter, the number of metrics could be potentialy huge.
We advise not to turn metrics on for such case, but only for a subset of tables.
Metrics will be sent following below conditions:
- Memory and disk used space is greater than 1MB
- Number of records are greater than 5000
- Number of delta records are greater than 500

Surveillance table

Parameter	Description
Active	If checked, the rule is enabled and will be processed
Schema	Can be used to restrict the monitoring on the tables within a given schema. A star (‘*’) will match any schema
Table	Can be used to restrict the monitoring on a given table. A star (‘*’) will match any table
Table type	Select the type of table to monitor between partitioned or non-partitioned
Records threshold	The threshold of the alarm on the maximum number of records
Max delta memory	The threshold of the alarm on the maximum number of delta records
Max delta records	The threshold of the alarm on the maximum delta memory (use KB/MB/GB units)
Max disk usage	The threshold of the alarm on the maximum disk used space (use KB/MB/GB units)
Delta time	The period of time used to make a delta comparison of the measured elements
Aggregate	If checked, one alarm will be sent indicating the number of tables reaching each threshold. Potentially, there could be one alarm per breached threshold. If not checked, one alarm per table breaching a threshold will be sent. Potentially, there could be one alarm per table and per threshold
Severity	Defines the level of severity of the alarm that will be generated if one of the thresholds is reached
Auto clear	If set, the generated alarms will be automatically cleared from the console if the alarm condition is not fulfilled anymore
Alarm tag	You can define some text to use as a prefix of the alarm message generated by the current rule
Alarm	Defines if an alarm has to be generated for the given rule
Metric	Defines if a metric has to be generated for the given rule

Generated metrics

metricId	metricUnit	metricTarget	metricDescription
TABLE_RECORD_COUNT	Records	SCHEMA.TABLE	Sends the number of records per CS table
TABLE_DELTA_RECORD_COUNT	Records	SCHEMA.TABLE	Sends the number of delta records per CS table
TABLE_DELTA_MEMORY	MegaBytes	SCHEMA.TABLE	Sends the used memory per CS table
TABLE_DISK_USAGE	MegaBytes	SCHEMA.TABLE	Sends disk used space per CS table

Table of Contents

HANA tables

Purpose

Configuration hints

Surveillance table

Generated metrics