optimize(ANALYZE); //带参数 快速检查; 类似于完整性检查 PRAGMA quick_check; --- 快速检查; 类似于完整性检查,只是它不验证 UNIQUE 约束,也不验证索引内容是否与表内容匹配。通过跳过 UNIQUE 和索引一致性检查,quick_check 能够运行得更快。 PRAGMA quick_check('表名'); 返回有关模式中的表和视图的信息 ...
2.PRAGMA totalParse.optimize(ANALYZE); //带参数 快速检查; 类似于完整性检查 PRAGMA quick_check;--- 快速检查; 类似于完整性检查,只是它不验证 UNIQUE 约束,也不验证索引内容是否与表内容匹配。通过跳过 UNIQUE 和索引一致性检查,quick_check 能够运行得更快。PRAGMA quick_check('表名'); 返回有...
就是告诉编译器,不要优化 如果优化的话,因为while里面的东西是一样的,有些编译器会把while循环优化掉,造成延时时间不正确甚至不延时。谢谢采纳
1.PRAGMA totalParse.optimize; --为了获得最佳的长期查询性能而不需要对应用程序模式和 SQL 进行详细的工程分析,建议应用程序在关闭每个数据库连接之前运行“PRAGMA optimize”(不带参数) 。长时间运行的应用程序也可能受益于设置计时器以每隔几个小时运行一次“PRAGMA 优化”。 2.PRAGMA totalParse.optimize(ANALYZE);...
In principle, an optimizer that recognizes this attribute could insert the appropriate edges in the control flow graph, thus handling function calls safely in functions that callsetjmp(), while maintaining the ability to optimize code in unaffected parts of the flow graph. ...
(push) // 保存当前警告设置 #pragma warning(disable: 4996) // 禁用警告 // 恢复警告...5.1 基本语法 #pragma optimize 用于启用或禁用特定优化选项,主要用在性能敏感的代码片段中:语法形式 作用 说明 #pragma optimize("", on) 启用所有优化选项。...启用编译器优化功能,参数为空字符串表示所有优化,on ...
FMT_PRAGMA_GCC(optimize("Og")) #endif FMT_CLANG_PRAGMA(diagnostic push) FMT_PRAGMA_CLANG(diagnostic push)FMT_BEGIN_NAMESPACE@@ -401,7 +401,7 @@ inline auto map(uint128_opt) -> monostate { return {}; } #endif#if FMT_USE_BITINT ...
To see all optimizations that would have been done without actually doing them, run "PRAGMA optimize(-1)". To use only the ANALYZE optimization, run "PRAGMA optimize(0x02)".Determination Of When To Run AnalyzeIn the current implementation, a table is analyzed if and only if all of the ...
In principle, an optimizer that recognizes this attribute could insert the appropriate edges in the control flow graph, thus handling function calls safely in functions that callsetjmp(), while maintaining the ability to optimize code in unaffected parts of the flow graph. ...