Details
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Bug
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Status: Closed (View Workflow)
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Minor
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Resolution: Fixed
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10.0.21
Description
From slow query log:
# Thread_id: 161 Schema: hotspot QC_hit: No
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# Query_time: 17.934323 Lock_time: 0.000119 Rows_sent: 0 Rows_examined: 4
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#
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# explain: id select_type table type possible_keys key key_len ref rows Extra
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# explain: 1 SIMPLE radacct range AcctSessionId,UserName_AcctSessionId,UserStop UserName_AcctSessionId 52 NULL 1 Using where; Using buffer
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#
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SET timestamp=1443470903;
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UPDATE radacct ....
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Got same query plan with explain:
Found in slow query log. Tried to look up what "Using buffer" on https://mariadb.com/kb/en/mariadb/explain/ actually mean and couldn't see an explanation.
Attachments
Issue Links
- relates to
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MDEV-9133 range chosen for update while ref used for select on multicolumn index with length
- Closed