Notice (8): file_put_contents(): Write of 274 bytes failed with errno=28 No space left on device [CORE/src/Log/Engine/FileLog.php, line 140]

        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

Notice (8): SplFileObject::fwrite() [<a href='https://secure.php.net/splfileobject.fwrite'>splfileobject.fwrite</a>]: Write of 97 bytes failed with errno=28 No space left on device [CORE/src/Cache/Engine/FileEngine.php, line 141]

Code Context

        $success = $this->_File->ftruncate(0) &&
            $this->_File->fwrite($contents) &&
            $this->_File->fflush();

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

Warning (512): long cache was unable to write 'dc891acf804371e110aa6f32bb82718e' to Cake\Cache\Engine\FileEngine cache [CORE/src/Cache/Cache.php, line 275]

Code Context

                ),
                E_USER_WARNING
            );

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

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]

Code Context

        $success = $this->_File->ftruncate(0) &&
            $this->_File->fwrite($contents) &&
            $this->_File->fflush();

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

Warning (512): long cache was unable to write 'c7d9115dab7261cfbed71060eac7cf4f' to Cake\Cache\Engine\FileEngine cache [CORE/src/Cache/Cache.php, line 275]

Code Context

                ),
                E_USER_WARNING
            );

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

sqlserver中几种典型的等待

数据库操作教程 2022-09-23 18:07:38 转载来源: 网络整理/侵权必删

为了准备今年的双11很久没有更新blog，在最近的几次sqlserver问题的排查中，总结了sqlserver几种典型的等待类型，类似于oracle中的等待事件，如果看到这样的等待类型时候能够迅速定位问题的根源,下面通过一则案例来把这些典型的等待处理方法整理出来：第一种等待.memory等待早上接到一用户反馈其RDS实例非常的慢，通过观察sqlserver活动会话监视器（activemonitor）的waitingtasks（类似于mysql的threadrunning）可以看到有10多w的等待任务,可以明确数据库现在已经出现了较大的瓶颈，紧接着通过resourcewaits看到数据库中有大量的memory内存等待：看到是memory资源等待后，为了立刻恢复用户应用，想到立刻去调大内存，发现该实例已经是24G了，看来一下os的空余内存，还有较多的内存剩余，所以将内存调大到36G，发现resourcewaits还是在memory上等待，同时这个时候的cpu使用率飙升，达到了90%左右（之前在10%左右的等待）.这样解决不了根本问题，于是通过recentexpensivequeries,发

为了准备今年的双11很久没有更新blog，在最近的几次sqlserver问题的排查中，总结了sqlserver几种典型的等待类型，类似于oracle中的等待事件，如果看到这样的等待类型时候能够迅速定位问题的根源,下面通过一则案例来把这些典型的等待处理方法整理出来：

第一种等待.memory等待

早上接到一用户反馈其RDS实例非常的慢，通过观察sqlserver活动会话监视器（active monitor）的waiting tasks（类似于mysql的thread running）可以看到有10多w的等待任务,可以明确数据库现在已经出现了较大的瓶颈，紧接着通过resource waits看到数据库中有大量的memory内存等待：

看到是memory 资源等待后，为了立刻恢复用户应用，想到立刻去调大内存，发现该实例已经是24G了，看来一下os的空余内存，还有较多的内存剩余，所以将内存调大到36G，发现resource waits还是在memory上等待，同时这个时候的cpu使用率飙升，达到了90%左右（之前在10%左右的等待）.这样解决不了根本问题，于是通过recent expensive queries,发现以下sql的逻辑读很高，执行非常频繁：

SELECT * FROM RefundOrder_Message messages0_ WHERE messages0_.Order_Id=@p0;

也可以通过如下方式获得造成内存等待的sql：
SELECT st.text FROM sys.dm_exec_query_memory_grants req CROSS APPLY sys.dm_exec_sql_text(req.sql_handle) as ST where req.grant_time is NULL or req.granted_memory_kb is NULL

The columns grant_time and granted_memory_kb will be NULL for those queries which are waiting to get their requested memory

sp_helpindex RefundOrder_Message
发现该表只有一个主键索引：

创建一下索引：
create index ind_RefundOrder_Message_order_id on RefundOrder_Message(Order_Id);

第二种等待：latch等待

在索引加上去后，memory的等待立刻消失，但是resource waits的等待变为了 lock：

通过以下内部视图可以发现如下调用出现了等待：
SELECT ss.host_name, req.blocking_session_id,req.wait_type ,req.wait_time ,req.wait_resource ,req.transaction_id ,st.text FROM sys.dm_exec_requests req CROSS APPLY sys.dm_exec_sql_text(req.sql_handle) as ST
cross apply sys.dm_exec_sessions ss where req.status =N'suspended' and ss.session_id=req.session_id;

得到阻塞其他会话的sql：
(@p0 int,@p1 nvarchar(4000),@p2 bit)
SELECT TOP (@p0) this.* FROM ViewSalesOrder this_ WHERE this_.MemberCode = @p1 and this_.IsObsolete = @p2 ORDER BY this_.OdCode desc;

视图ViewSalesOrder是一张非常核心的视图，里面关联了订单，订单消息，订单发货等多个业务逻辑；查询条件中代入了membercode为店铺的名称，可能操作某个店铺的订单；
通过ViewSalesOrder视图中的定义，membercode，IsObsolete ，OdCode 为salesOrder表的三个字段，查看salesOrder上并没有相应的索引，于是加上如下索引：
create index ind_salesOrder_member on salesOrder(membercode,IsObsolete,code)；
在添加完索引后，数据库的waiting tasks 下降，batch requests提升：

第三种等待：lock

第三种等待是常见的等待，常见的情况在删除，更新的时候由于条件中没有合适的索引导致锁定的记录范围太大，导致阻塞其他的会话请求：

用户在在进行压测的时候发现一条更新语句执行的非常慢，导致整个系统都卡住：

update DD_ShenHe set ZF = 0 where zf is null;

查看dd_shenhe表上面的索引：

可以看到表中并没有zf字段的索引，而该表总共有400w的数据，zf 为null的有8000条，所以在zf字段添加索引是合适的：

Create index ind_dd_shenhe_zf on dd_shenhe(zf);

添加完索引后，系统恢复正常。

标签: sqlserver 几种典型的等待

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