*: add statistic lock/unlock function #38387
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| tableID = task.idxIncrementalExec.tableID | ||
| } | ||
| // skip locked tables | ||
| if !statsHandle.IsTableLocked(tableID.TableID) { |
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Maybe we can use warnings to remind users that the table is locked.
statistics/handle/handle.go
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| } | ||
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| if len(tids) > 1 { | ||
| err = finishTransaction(ctx, exec, err) |
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Maybe it is better to defer finishTransaction right after begin begin pessimistic.
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if finishTransaction get failed, 'mysql.stats_table_locked' won't be updated, and "h.tableLocked = tableLocked" won't be execute, so h.tableLocked is consistent with table.
if change to defer finishTransaction , if finishTransaction get failed, table won't be updated but h.tableLocked will be updated, data in table and memory is inconsistent.
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@pingandb Please solve the conflicting. |
statistics/handle/handle.go
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| // GetTableLockedAndClear for unit test only | ||
| func (h *Handle) GetTableLockedAndClear() []int64 { |
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Add ForTest to make its scope clearer
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| exec := h.mu.ctx.(sqlexec.SQLExecutor) | ||
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| if len(tids) > 1 { |
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Now we also have to consider len(pids). Maybe we can all use begin pessimistic for simplicity?
statistics/handle/handle.go
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| ctx := kv.WithInternalSourceType(context.Background(), kv.InternalTxnStats) | ||
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| exec := h.mu.ctx.(sqlexec.SQLExecutor) | ||
| if len(tids) > 1 { |
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TiDB MergeCI notify🔴 Bad News! New failing [3] after this pr merged.
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What problem does this PR solve?
Issue Number: close #xxx
Problem Summary:
Sometime peformance drop due to the explain change that caused by statistic info change after data changes in table.
So we want to introduce table statistic lock/unlock function to avoid unexpected peformance drop by statistic changes.
What is changed and how it works?
The main idea is adding new table mysql.stats_table_locked to record which table is locked, and when doing manual/auto table analyze, check whether table is locked, if locked, skip analyse. And I also filter the locked table in session stat collector operations, that session stat collector won't collect the statistic data of locked table.
Add SQL syntax 'lock/unlock stats xxx(table name)' to add/remove table name to/from mysql.stats_table_locked.
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