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Performance of parallel execution time of query to flex table
When you run a parallel query to flex table, At this time, all processing is slow.
For example, two queries execute,
1 query about 100sec,
2 queries about 200sec/query, Much as both.
At this time, there is a margin in cpu utilization.
and
When to parallel processing of a single query to flextable can be slow,
EXECUTIONPARALLELISM=30 180sec CPU Usage 3000%
EXECUTIONPARALLELISM=5 95sec CPU Usage 500%
EXECUTIONPARALLELISM=1 58sec CPU Usage 100%
EXECUTIONPARALLELISM=1 is fastest and CPU usage is the lowest!
Test environment spec
5node cluster(cpu 32, mem 128GB, HDD 12TB)
For example, two queries execute,
1 query about 100sec,
2 queries about 200sec/query, Much as both.
At this time, there is a margin in cpu utilization.
and
When to parallel processing of a single query to flextable can be slow,
EXECUTIONPARALLELISM=30 180sec CPU Usage 3000%
EXECUTIONPARALLELISM=5 95sec CPU Usage 500%
EXECUTIONPARALLELISM=1 58sec CPU Usage 100%
EXECUTIONPARALLELISM=1 is fastest and CPU usage is the lowest!
Test environment spec
5node cluster(cpu 32, mem 128GB, HDD 12TB)
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