內容簡介
管理員儀表板小工具，監控查詢緩存(query cache)效能統計數據- 以優化大小配置並突顯瓶頸。
每次頁面載入都會重新執行“選項自動載入大小”的查詢，其結果大小隨時間增加，與插件保存的數據量密切相關。
重量級插件可能會大大增加此查詢結果的大小。
已發現編寫不良的插件會不斷增加此查詢結果的大小。
過大的“選項自動載入大小”結果是慢速WordPress站點的頂級因素，也可能是性能突然下降的潛在原因。
監視“選項自動載入大小”可應用於“查詢緩存大小”和“查詢緩存限制”兩者之間。
當“Qcache_lowmem_prunes”發生時進行監控。
外掛標籤
開發者團隊
原文外掛簡介
Admin dashboard widget measuring and monitoring MySQL / MariaDB query cache performance & statistics – to optimize sizing configuration and highlight bottlenecks.
Why
Database Query for Options Autoload is repeatedly executed for each WP page load and its poor performance has been identified as a good indicator for a poorly performing database resulting in slow site.
How
Use dashboard widget to measure and monitor Options Autoload Query Time
Use dashboard widget to measure and monitor Options Autoload Query Size
This query result size increases constantly over time, as WP site usage grows – but its oversized sudden growth or constant balooning must not be overlooked.
Heavy plugins might rely heavily on adding data to Options Autoload Query Size.
Poorly written plugins causing WP performance degradation have been found to constantly increase this query result size.
Time Metrics
‘Options Autoload Query Time’ is measured in milliseconds (ms)
0 ms – great performance below one millisecond
1-2 ms – good performance
3-5 ms – OK performance
50+ ms – poor performance should be investigated
Size Metrics
‘Options Autoload Size’ is measured in Bytes
If you have the control to enable the database server wide query cache – configure query_cache_limit to be larger than Options Autoload Size
20,000 Bytes – freshly installed clean wordpress site
30,000 Bytes – small wordpress site
50,000 Bytes – medium wordpress site
250,000 Bytes – large wordpress site
2,000,000+ Bytes – too large should be investigated
( all above are rough metrics )
