`usage` int UNSIGNED NOT NULL DEFAULT 0 COMMENT '浣跨敤閲', `max_size` int UNSIGNED NOT NULL DEFAULT 0 COMMENT '鍗曚釜閰嶇疆澶у皬涓婇檺錛屽崟浣嶄負(fù)瀛楄妭錛?琛ㄧず浣跨敤榛樿?鍊', `max_aggr_count` int UNSIGNED NOT NULL DEFAULT 0 COMMENT
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