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6 changes: 1 addition & 5 deletions Database-Features/analyzing-disk-i-o-and-concurrency-based-on-last-day-data.md
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# Analyzing disk I/O and concurrency based on *_last_day data

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## Background

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System performance data about disk I/O and concurrency is sought. 

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To check for I/O spikes based on hourly data:


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```sql
select
trunc(measure_time, 'HH') as interval_hour,
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group by 1
order by 1
;
```

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## Step 2

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### Query concurrency

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* percentage of queries with HDD_READ
* average (MB/sec/node) and total (GB/cluster) HDD_READ caused by SQL


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```sql
with k1 as (
-- preselected statements. Add type filter (COMMAND_NAME) or user filter (sessions/auditing) when required
select session_id, stmt_id, start_time, stop_time, hdd_read, temp_db_ram_peak, seconds_between(stop_time, start_time) as stmt_duration

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from exa_sql_last_day

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)


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```
## Additional References

<https://www.exasol.com/support/browse/EXASOL-1598>

<https://www.exasol.com/support/browse/EXASOL-2373>

[Statistical System Tables](https://docs.exasol.com/sql_references/metadata/statistical_system_table.htm)

*We appreciate your input! Share your knowledge by contributing to the Knowledge Base directly in [GitHub](https://github.com/exasol/public-knowledgebase).*
*We appreciate your input! Share your knowledge by contributing to the Knowledge Base directly in [GitHub](https://github.com/exasol/public-knowledgebase).*