Update tidb_dml_batch_size section (#7371) #8220
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tidb_dml_batch_size is only effective when another variable is turned on 'tidb_batch_insert', however it is not documented causing some confusion for customer
commit new change according to morgan's suggestion Co-authored-by: Morgan Tocker <tocker@gmail.com>
Co-authored-by: TomShawn <41534398+TomShawn@users.noreply.github.com>
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This is an automated cherry-pick of #7371
tidb_dml_batch_size is only effective when another variable is turned on 'tidb_batch_insert',
however it is not documented causing some confusion for customer
What is changed, added or deleted? (Required)
added
'tidb_batch_insert' parameter is required to turn on in order for 'tidb_dml_batch_size' to work, but information is currently missing in the doc
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