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        Tune up network settings On the client side: Increase the ephermal port range, and decrease the fin_timeout To find out the default values: sysctl net.ipv4.ip_local_port_range sysctl net.ipv4.tcp_fin_timeout The ephermal port range defines the maximum num
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    日期:2024-04-19
    列引用 含義 col_name 來自於任意表的列col_name,用於包含該表的一個列的查詢中 tbl_name.col_name 來自當前的資料庫的表tbl_name的列col_name db_name.tbl_name.col_name 行列col_name從表格tbl_name資料庫db_name。這個形式在MySQL3.22或以後版本 ......
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    日期:2024-04-19
    The server does not write queries handled by the query cache to the slow query log, nor queries that would not benefit from the presence of an index because the table has zero rows or one row. Prior to MySQL 5.1.45, replication slaves did not write ......
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    日期:2024-04-15
    Andrea Gangini posted that slow queries made via prepared statements do not post to the slow query log. This is not exactly true. In the case of MySQL 5.0.22 when accessed through JDBC (Java 1.5.0), slow queries constructed via PreparedStatement always .....
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    日期:2024-04-12
    從一種 DB 轉到另一種 DB 的最初階段,徃徃要找自己原來熟悉的工具。拿我自己來說,算是有點 Oracle 的經驗,有時被問及 MySQL 優化的東西,就希朢找到 MySQL 上類似 Oracle 等待介面或是 SQL Trace 之類的工具,多少有些路徑依賴。...
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    日期:2024-04-13
    The slow query log consists of all SQL statements that took more than long_query_time seconds to execute and required at least min_examined_row_limit rows to be examined. The time to acquire the initial table locks is not counted as execution time. mysqld...
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    日期:2024-04-13
    # Log slow queries. Slow queries are queries which take more than the # amount OF TIME defined IN "long_query_time" OR which do NOT USE # indexes well, IF log_short_format IS NOT enabled. It IS normally good idea # TO have this turned ON IF you frequently...
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    日期:2024-04-17
    由於最近自己管理的mysql有出現查詢慢的情況,為了能夠查詢出慢查詢的sql語句,故啟動了mysql的慢查詢日誌,具體啟動慢查詢的方法有以下兩種: 1、直接登入mysql, 更改mysql參數.(註:登入賬號需有管理員許可權) mysql set global log_slow_queries=on; mysql...
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    日期:2024-04-13
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