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statistics: avoid update delta when delta modified count is 0 #5164

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Nov 21, 2017
Merged

statistics: avoid update delta when delta modified count is 0 #5164

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3 changes: 3 additions & 0 deletions statistics/update.go
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Original file line number Diff line number Diff line change
Expand Up @@ -121,6 +121,9 @@ func (h *Handle) DumpStatsDeltaToKV() {

// dumpTableStatDeltaToKV dumps a single delta with some table to KV and updates the version.
func (h *Handle) dumpTableStatDeltaToKV(id int64, delta variable.TableDelta) error {
if delta.Count == 0 {
return nil
}
_, err := h.ctx.(sqlexec.SQLExecutor).Execute("begin")
if err != nil {
return errors.Trace(err)
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