if (!$mask) { file_put_contents($pathname, $message . "\n", FILE_APPEND);
file_put_contents - [internal], line ??
Cake\Log\Engine\FileLog::log() - CORE/src/Log/Engine/FileLog.php, line 140
Cake\Log\Log::write() - CORE/src/Log/Log.php, line 392
Cake\Log\Log::warning() - CORE/src/Log/Log.php, line 477
DebugKit\ToolbarService::isSuspiciouslyProduction() - ROOT/vendor/cakephp/debug_kit/src/ToolbarService.php, line 169
DebugKit\ToolbarService::isEnabled() - ROOT/vendor/cakephp/debug_kit/src/ToolbarService.php, line 105
DebugKit\Plugin::bootstrap() - ROOT/vendor/cakephp/debug_kit/src/Plugin.php, line 48
Cake\Http\BaseApplication::pluginBootstrap() - CORE/src/Http/BaseApplication.php, line 182
Cake\Http\Server::bootstrap() - CORE/src/Http/Server.php, line 111
Cake\Http\Server::run() - CORE/src/Http/Server.php, line 79
[main] - ROOT/webroot/index.php, line 40
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Notice (8): SplFileObject::fwrite() [<a href='https://secure.php.net/splfileobject.fwrite'>splfileobject.fwrite</a>]: Write of 284 bytes failed with errno=28 No space left on device [CORE/src/Cache/Engine/FileEngine.php, line 141]
SplFileObject::fwrite() - [internal], line ??
Cake\Cache\Engine\FileEngine::set() - CORE/src/Cache/Engine/FileEngine.php, line 141
Cake\I18n\TranslatorRegistry::get() - CORE/src/I18n/TranslatorRegistry.php, line 206
Cake\I18n\I18n::getTranslator() - CORE/src/I18n/I18n.php, line 148
__ - CORE/src/I18n/functions.php, line 45
App\Controller\NewsController::view() - APP/Controller/NewsController.php, line 3420
Cake\Controller\Controller::invokeAction() - CORE/src/Controller/Controller.php, line 539
Cake\Controller\ControllerFactory::handle() - CORE/src/Controller/ControllerFactory.php, line 140
Cake\Controller\ControllerFactory::invoke() - CORE/src/Controller/ControllerFactory.php, line 115
Cake\Http\BaseApplication::handle() - CORE/src/Http/BaseApplication.php, line 317
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 77
Cake\Http\Middleware\CsrfProtectionMiddleware::process() - CORE/src/Http/Middleware/CsrfProtectionMiddleware.php, line 174
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 73
Cake\I18n\Middleware\LocaleSelectorMiddleware::process() - CORE/src/I18n/Middleware/LocaleSelectorMiddleware.php, line 61
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 73
Cake\Http\Middleware\BodyParserMiddleware::process() - CORE/src/Http/Middleware/BodyParserMiddleware.php, line 157
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 73
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Notice (8): SplFileObject::fwrite() [<a href='https://secure.php.net/splfileobject.fwrite'>splfileobject.fwrite</a>]: Write of 117 bytes failed with errno=28 No space left on device [CORE/src/Cache/Engine/FileEngine.php, line 141]
SplFileObject::fwrite() - [internal], line ??
Cake\Cache\Engine\FileEngine::set() - CORE/src/Cache/Engine/FileEngine.php, line 141
Cake\Cache\Cache::write() - CORE/src/Cache/Cache.php, line 266
App\Controller\NewsController::action_() - APP/Controller/NewsController.php, line 6766
App\Controller\NewsController::get_data() - APP/Controller/NewsController.php, line 5701
App\Controller\NewsController::action_cache() - APP/Controller/NewsController.php, line 5625
App\Controller\NewsController::cache_action() - APP/Controller/NewsController.php, line 5281
App\Controller\NewsController::view() - APP/Controller/NewsController.php, line 3634
Cake\Controller\Controller::invokeAction() - CORE/src/Controller/Controller.php, line 539
Cake\Controller\ControllerFactory::handle() - CORE/src/Controller/ControllerFactory.php, line 140
Cake\Controller\ControllerFactory::invoke() - CORE/src/Controller/ControllerFactory.php, line 115
Cake\Http\BaseApplication::handle() - CORE/src/Http/BaseApplication.php, line 317
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 77
Cake\Http\Middleware\CsrfProtectionMiddleware::process() - CORE/src/Http/Middleware/CsrfProtectionMiddleware.php, line 174
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 73
Cake\I18n\Middleware\LocaleSelectorMiddleware::process() - CORE/src/I18n/Middleware/LocaleSelectorMiddleware.php, line 61
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 73
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Warning (512): long cache was unable to write '7f2835bf0bfe6f9d0d2039bb85ef774f' to Cake\Cache\Engine\FileEngine cache [CORE/src/Cache/Cache.php, line 275]
Cake\Cache\Cache::write() - CORE/src/Cache/Cache.php, line 275
App\Controller\NewsController::action_() - APP/Controller/NewsController.php, line 6766
App\Controller\NewsController::get_data() - APP/Controller/NewsController.php, line 5701
App\Controller\NewsController::action_cache() - APP/Controller/NewsController.php, line 5625
App\Controller\NewsController::cache_action() - APP/Controller/NewsController.php, line 5281
App\Controller\NewsController::view() - APP/Controller/NewsController.php, line 3634
Cake\Controller\Controller::invokeAction() - CORE/src/Controller/Controller.php, line 539
Cake\Controller\ControllerFactory::handle() - CORE/src/Controller/ControllerFactory.php, line 140
Cake\Controller\ControllerFactory::invoke() - CORE/src/Controller/ControllerFactory.php, line 115
Cake\Http\BaseApplication::handle() - CORE/src/Http/BaseApplication.php, line 317
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 77
Cake\Http\Middleware\CsrfProtectionMiddleware::process() - CORE/src/Http/Middleware/CsrfProtectionMiddleware.php, line 174
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 73
Cake\I18n\Middleware\LocaleSelectorMiddleware::process() - CORE/src/I18n/Middleware/LocaleSelectorMiddleware.php, line 61
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 73
Cake\Http\Middleware\BodyParserMiddleware::process() - CORE/src/Http/Middleware/BodyParserMiddleware.php, line 157
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Notice (8): SplFileObject::fwrite() [<a href='https://secure.php.net/splfileobject.fwrite'>splfileobject.fwrite</a>]: Write of 109 bytes failed with errno=28 No space left on device [CORE/src/Cache/Engine/FileEngine.php, line 141]
SplFileObject::fwrite() - [internal], line ??
Cake\Cache\Engine\FileEngine::set() - CORE/src/Cache/Engine/FileEngine.php, line 141
Cake\Cache\Cache::write() - CORE/src/Cache/Cache.php, line 266
App\Controller\NewsController::action_() - APP/Controller/NewsController.php, line 6766
App\Controller\NewsController::get_data() - APP/Controller/NewsController.php, line 5701
App\Controller\NewsController::action_cache() - APP/Controller/NewsController.php, line 5625
App\Controller\NewsController::cache_action() - APP/Controller/NewsController.php, line 5281
App\Controller\NewsController::view() - APP/Controller/NewsController.php, line 3663
Cake\Controller\Controller::invokeAction() - CORE/src/Controller/Controller.php, line 539
Cake\Controller\ControllerFactory::handle() - CORE/src/Controller/ControllerFactory.php, line 140
Cake\Controller\ControllerFactory::invoke() - CORE/src/Controller/ControllerFactory.php, line 115
Cake\Http\BaseApplication::handle() - CORE/src/Http/BaseApplication.php, line 317
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 77
Cake\Http\Middleware\CsrfProtectionMiddleware::process() - CORE/src/Http/Middleware/CsrfProtectionMiddleware.php, line 174
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 73
Cake\I18n\Middleware\LocaleSelectorMiddleware::process() - CORE/src/I18n/Middleware/LocaleSelectorMiddleware.php, line 61
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 73
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Warning (512): long cache was unable to write 'ba274080e3466ca62dc35fc90231577b' to Cake\Cache\Engine\FileEngine cache [CORE/src/Cache/Cache.php, line 275]
Cake\Cache\Cache::write() - CORE/src/Cache/Cache.php, line 275
App\Controller\NewsController::action_() - APP/Controller/NewsController.php, line 6766
App\Controller\NewsController::get_data() - APP/Controller/NewsController.php, line 5701
App\Controller\NewsController::action_cache() - APP/Controller/NewsController.php, line 5625
App\Controller\NewsController::cache_action() - APP/Controller/NewsController.php, line 5281
App\Controller\NewsController::view() - APP/Controller/NewsController.php, line 3663
Cake\Controller\Controller::invokeAction() - CORE/src/Controller/Controller.php, line 539
Cake\Controller\ControllerFactory::handle() - CORE/src/Controller/ControllerFactory.php, line 140
Cake\Controller\ControllerFactory::invoke() - CORE/src/Controller/ControllerFactory.php, line 115
Cake\Http\BaseApplication::handle() - CORE/src/Http/BaseApplication.php, line 317
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 77
Cake\Http\Middleware\CsrfProtectionMiddleware::process() - CORE/src/Http/Middleware/CsrfProtectionMiddleware.php, line 174
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 73
Cake\I18n\Middleware\LocaleSelectorMiddleware::process() - CORE/src/I18n/Middleware/LocaleSelectorMiddleware.php, line 61
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 73
Cake\Http\Middleware\BodyParserMiddleware::process() - CORE/src/Http/Middleware/BodyParserMiddleware.php, line 157
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unserialize - [internal], line ??
App\Controller\NewsController::action_cache() - APP/Controller/NewsController.php, line 5571
App\Controller\NewsController::cache_action() - APP/Controller/NewsController.php, line 5281
App\Controller\NewsController::article_show() - APP/Controller/NewsController.php, line 4290
App\Controller\NewsController::view() - APP/Controller/NewsController.php, line 3822
Cake\Controller\Controller::invokeAction() - CORE/src/Controller/Controller.php, line 539
Cake\Controller\ControllerFactory::handle() - CORE/src/Controller/ControllerFactory.php, line 140
Cake\Controller\ControllerFactory::invoke() - CORE/src/Controller/ControllerFactory.php, line 115
Cake\Http\BaseApplication::handle() - CORE/src/Http/BaseApplication.php, line 317
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 77
Cake\Http\Middleware\CsrfProtectionMiddleware::process() - CORE/src/Http/Middleware/CsrfProtectionMiddleware.php, line 174
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 73
Cake\I18n\Middleware\LocaleSelectorMiddleware::process() - CORE/src/I18n/Middleware/LocaleSelectorMiddleware.php, line 61
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 73
Cake\Http\Middleware\BodyParserMiddleware::process() - CORE/src/Http/Middleware/BodyParserMiddleware.php, line 157
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 73
Cake\Routing\Middleware\RoutingMiddleware::process() - CORE/src/Routing/Middleware/RoutingMiddleware.php, line 161
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App\Controller\NewsController::action_cache() - APP/Controller/NewsController.php, line 5571
App\Controller\NewsController::cache_action() - APP/Controller/NewsController.php, line 5281
App\Controller\NewsController::article_show() - APP/Controller/NewsController.php, line 4310
App\Controller\NewsController::view() - APP/Controller/NewsController.php, line 3822
Cake\Controller\Controller::invokeAction() - CORE/src/Controller/Controller.php, line 539
Cake\Controller\ControllerFactory::handle() - CORE/src/Controller/ControllerFactory.php, line 140
Cake\Controller\ControllerFactory::invoke() - CORE/src/Controller/ControllerFactory.php, line 115
Cake\Http\BaseApplication::handle() - CORE/src/Http/BaseApplication.php, line 317
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 77
Cake\Http\Middleware\CsrfProtectionMiddleware::process() - CORE/src/Http/Middleware/CsrfProtectionMiddleware.php, line 174
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 73
Cake\I18n\Middleware\LocaleSelectorMiddleware::process() - CORE/src/I18n/Middleware/LocaleSelectorMiddleware.php, line 61
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 73
Cake\Http\Middleware\BodyParserMiddleware::process() - CORE/src/Http/Middleware/BodyParserMiddleware.php, line 157
Cake\Http\Runner::handle() - CORE/src/Http/Runner.php, line 73
Cake\Routing\Middleware\RoutingMiddleware::process() - CORE/src/Routing/Middleware/RoutingMiddleware.php, line 161
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SQL Server 根据需要动态获取和释放内存。通常,管理员不必指定应分配给 SQL Server 的内存量,尽管该选项仍然存在并且在某些环境中是必需的。
所有数据库软件的主要设计目标之一是最小化磁盘 I/O,因为磁盘读取和写入是最耗费资源的操作之一。SQL Server 在内存中构建一个缓冲池,以保存从数据库中读取的页。SQL Server 中的许多代码专用于最大程度地减少磁盘和缓冲池之间的物理读取和写入次数。SQL Server 试图在两个目标之间取得平衡:
SQL Server 数据库引擎的默认内存管理行为是根据需要获取尽可能多的内存,而不会在系统上造成内存不足。SQL Server 数据库引擎通过使用 Microsoft Windows 中的内存通知 API 来执行此操作。
当 SQL Server 动态使用内存时,它会定期查询系统以确定可用内存量。维护此可用内存可防止操作系统 (OS) 分页。如果可用内存较少,SQL Server 将向操作系统释放内存。如果有更多内存可用,SQL Server 可能会分配更多内存。SQL Server 仅在其工作负荷需要更多内存时才添加内存;静态服务器不会增加其虚拟地址空间的大小。如果您注意到任务管理器和性能监视器在使用动态内存管理时显示可用内存稳定减少,这是默认行为,不应被视为内存泄漏。
最大服务器内存控制 SQL Server 内存分配、编译内存、所有缓存(包括缓冲池)、查询执行内存授予、锁管理器内存和 CLR1记忆(基本上是在sys.dm_os_memory_clerks中找到的任何记忆职员)。
CLR 内存在从 SQL Server 2012 (11.x) 开始的max_server_memory分配下进行管理。
示例:查询返回有关当前分配的内存的信息。
SELECT physical_memory_in_use_kb/1024 AS sql_physical_memory_in_use_MB, large_page_allocations_kb/1024 AS sql_large_page_allocations_MB, locked_page_allocations_kb/1024 AS sql_locked_page_allocations_MB, virtual_address_space_reserved_kb/1024 AS sql_VAS_reserved_MB, virtual_address_space_committed_kb/1024 AS sql_VAS_committed_MB, virtual_address_space_available_kb/1024 AS sql_VAS_available_MB, page_fault_count AS sql_page_fault_count, memory_utilization_percentage AS sql_memory_utilization_percentage, process_physical_memory_low AS sql_process_physical_memory_low, process_virtual_memory_low AS sql_process_virtual_memory_lowFROM sys.dm_os_process_memory;
4.1、堆栈大小
线程堆栈的内存、CLR、文件.dll扩展过程、分布式查询引用的 OLE DB 提供程序、Transact-SQL 语句中引用的自动化对象以及非 SQL Server DLL 分配的任何内存不受最大服务器内存 (MB) 的控制。
当 SQL Server 启动时,它会根据多个参数(如系统上的物理内存量、服务器线程数和各种启动参数)计算缓冲池的虚拟地址空间的大小。SQL Server 为缓冲池保留其进程虚拟地址空间的计算量,但它仅获取(提交)当前加载所需的物理内存量。
然后,实例会根据需要继续获取内存以支持工作负载。随着越来越多的用户连接和运行查询,SQL Server 会按需获取更多的物理内存。SQL Server 实例继续获取物理内存,直到达到其最大服务器内存 (MB) 分配目标或操作系统指示不再有多余的可用内存;当内存超过最小服务器内存设置时,它会释放内存,并且操作系统指示可用内存不足。
当其他应用程序在运行 SQL Server 实例的计算机上启动时,它们会消耗内存,并且可用物理内存量将低于 SQL Server 目标。SQL Server 实例调整其内存消耗。如果另一个应用程序停止并且有更多内存可用,则 SQL Server 实例会增加其内存分配的大小。SQL Server 每秒可以释放和获取几兆字节的内存,从而能够快速适应内存分配更改。
五、缓冲区管理
SQL Server 数据库的主要用途是存储和检索数据,因此密集磁盘 I/O 是数据库引擎的核心特征。由于磁盘 I/O 操作可能会消耗许多资源并且需要相对较长的时间才能完成,因此 SQL Server 专注于提高 I/O 的效率。缓冲液管理是实现这种效率的关键组成部分。缓冲区管理组件由两种机制组成:用于访问和更新数据库页的缓冲区管理器,以及用于减少数据库文件 I/O 的缓冲区缓存(也称为缓冲池)。
当 SQL Server 启动时,它会根据多个参数(如系统上的物理内存量、配置的最大服务器线程数和各种启动参数)计算缓冲区缓存的虚拟地址空间的大小。SQL Server 为缓冲区缓存保留此计算量的进程虚拟地址空间(称为内存目标),但它仅获取(提交)当前加载所需的物理内存量。您可以查询sys.dm_os_sys_info目录视图中的committed_target_kb列和committed_kb列,以分别返回保留为内存目标的页数和缓冲区缓存中当前提交的页数。
SQL Server 启动和缓冲区缓存获取其内存目标之间的时间间隔称为上升。在此期间,读取请求会根据需要填充缓冲区。例如,单个 8 KB 页读取请求填充单个缓冲区页。这意味着上升取决于客户端请求的数量和类型。通过将单页读取请求转换为对齐的八页请求(构成一个范围)来加快提升速度。这使得爬坡可以更快地完成,尤其是在具有大量内存的机器上。
由于缓冲区管理器使用 SQL Server 进程中的大部分内存,因此它与内存管理器配合使用,以允许其他组件使用其缓冲区。缓冲区管理器主要与以下组件交互:
资源管理器,用于控制总体内存使用情况,在 32 位平台中,用于控制地址空间使用情况。
用于低级别文件 I/O 操作的数据库管理器和 SQL Server 操作系统 (SQLOS)。
用于预写日志记录的日志管理器。
5.2、支持的功能
缓冲区管理器可识别非一致性内存访问 (NUMA)。缓冲区缓存页分布在硬件 NUMA 节点上,这允许线程访问在本地 NUMA 节点上分配的缓冲区页,而不是从外部内存访问。
缓冲区管理器支持热添加内存,允许用户在不重新启动服务器的情况下添加物理内存。
缓冲区管理器支持 64 位平台上的大页面。页面大小特定于 Windows 版本。
缓冲区管理器提供通过动态管理视图公开的额外诊断。可以使用这些视图监视特定于 SQL Server 的各种操作系统资源。
SQL Server 可识别非一致性内存访问 (NUMA),并且在没有特殊配置的 NUMA 硬件上表现良好。随着时钟速度和处理器数量的增加,减少使用这种额外处理能力所需的内存延迟变得越来越困难。为了规避这种情况,硬件供应商提供了大型 L3 缓存,但这只是一个有限的解决方案。NUMA 体系结构为此问题提供了可扩展的解决方案。