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Fix Bug#56340 innodb updates index stats too frequently after non-index updates

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This is a simple optimization issue. All stats are related to only indexed
columns, index size or number of rows in the whole table. UPDATEs that touch
only non-indexed columns cannot affect stats and we can avoid calling the
function row_update_statistics_if_needed() which may result in unnecessary I/O.

Approved by:	Marko (rb://466)
This commit is contained in:
Vasil Dimov
2010-09-30 15:48:44 +03:00
parent 51cdf59546
commit eaaea8eb7d
2 changed files with 12 additions and 2 deletions
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7
storage/innodb_plugin/row/row0mysql.c
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@ -1422,7 +1422,12 @@ run_again:
srv_n_rows_updated++;
}
row_update_statistics_if_needed(prebuilt->table);
/* We update table statistics only if it is a DELETE or UPDATE
that changes indexed columns, UPDATEs that change only non-indexed
columns would not affect statistics. */
if (node->is_delete || !(node->cmpl_info & UPD_NODE_NO_ORD_CHANGE)) {
row_update_statistics_if_needed(prebuilt->table);
}
trx->op_info = "";