在 Yii 2.0 的控制台命令中，连接 Redis 时报错：yii/db/Exception: Redis error: ERR invalid DB index Redis command was: SELECT 29 in /vendor/yiisoft/yii2-redis/src/Connection.php:736 的分析解决

1、在 Yii 2.0 的控制台命令中，报错：yii/db/Exception: Redis error: ERR invalid DB index
Redis command was: SELECT 29 in /vendor/yiisoft/yii2-redis/src/Connection.php:736，查看 /console/runtime/logs/app.log

2019-08-09 09:44:13 [-][-][-][error][yii/db/Exception] yii/db/Exception: Redis error: ERR invalid DB index
Redis command was: SELECT 29 in /sobey/www/channel-pub-api/vendor/yiisoft/yii2-redis/src/Connection.php:736
Stack trace:
#0 /sobey/www/channel-pub-api/vendor/yiisoft/yii2-redis/src/Connection.php(713): yii/redis/Connection->parseResponse('SELECT 29')
#1 /sobey/www/channel-pub-api/vendor/yiisoft/yii2-redis/src/Connection.php(697): yii/redis/Connection->sendCommandInternal('*2/r/n$6/r/nSELECT/r...', Array)
#2 /sobey/www/channel-pub-api/vendor/yiisoft/yii2-redis/src/Connection.php(559): yii/redis/Connection->executeCommand('SELECT', Array)
#3 /sobey/www/channel-pub-api/vendor/yiisoft/yii2-redis/src/Connection.php(665): yii/redis/Connection->open()
#4 /sobey/www/channel-pub-api/vendor/yiisoft/yii2-redis/src/Connection.php(630): yii/redis/Connection->executeCommand('SET', Array)
#5 /sobey/www/channel-pub-api/vendor/yiisoft/yii2-queue/src/drivers/redis/Queue.php(135): yii/redis/Connection->__call('set', Array)
#6 /sobey/www/channel-pub-api/vendor/yiisoft/yii2-queue/src/drivers/redis/Queue.php(59): yii/queue/redis/Queue->reserve(3)
#7 [internal function]: yii/queue/redis/Queue->yii/queue/redis/{closure}(Object(Closure))
#8 /sobey/www/channel-pub-api/vendor/yiisoft/yii2-queue/src/cli/Queue.php(117): call_user_func(Object(Closure), Object(Closure))
#9 /sobey/www/channel-pub-api/vendor/yiisoft/yii2-queue/src/drivers/redis/Queue.php(68): yii/queue/cli/Queue->runWorker(Object(Closure))
#10 /sobey/www/channel-pub-api/vendor/yiisoft/yii2-queue/src/drivers/redis/Command.php(76): yii/queue/redis/Queue->run(true, 3)
#11 [internal function]: yii/queue/redis/Command->actionListen(3)
#12 /sobey/www/channel-pub-api/vendor/yiisoft/yii2/base/InlineAction.php(57): call_user_func_array(Array, Array)
#13 /sobey/www/channel-pub-api/vendor/yiisoft/yii2/base/Controller.php(157): yii/base/InlineAction->runWithParams(Array)
#14 /sobey/www/channel-pub-api/vendor/yiisoft/yii2/console/Controller.php(148): yii/base/Controller->runAction('listen', Array)
#15 /sobey/www/channel-pub-api/vendor/yiisoft/yii2/base/Module.php(528): yii/console/Controller->runAction('listen', Array)
#16 /sobey/www/channel-pub-api/vendor/yiisoft/yii2/console/Application.php(180): yii/base/Module->runAction('upload-asset-qu...', Array)
#17 /sobey/www/channel-pub-api/vendor/yiisoft/yii2/console/Application.php(147): yii/console/Application->runAction('upload-asset-qu...', Array)
#18 /sobey/www/channel-pub-api/vendor/yiisoft/yii2/base/Application.php(386): yii/console/Application->handleRequest(Object(yii/console/Request))
#19 /sobey/www/channel-pub-api/yii(23): yii/base/Application->run()
#20 {main}

2、分析发现，是在执行命令：SELECT 29 时，切换到相应数据库：29 时报错的，一个 redis 实例默认有 16 个数据库，从 0 – 15，超出这个范围就会报 ERR invalid DB index，如图1

图1

#0 /sobey/www/channel-pub-api/vendor/yiisoft/yii2-redis/src/Connection.php(713): yii/redis/Connection->parseResponse('SELECT 29')

3、编辑 redis.windows.conf 与 redis.windows-service.conf 文件，查找：databases 16，修改为：databases 32

# Set the number of databases. The default database is DB 0, you can select
# a different one on a per-connection basis using SELECT <dbid> where
# dbid is a number between 0 and 'databases'-1
databases 32

4、在 Windows 10 中，停止与启动 Redis

PS C:/> redis-server --service-stop
[87292] 09 Aug 10:44:18.772 # Redis service successfully stopped.
PS C:/> redis-server --service-start
[77236] 09 Aug 10:44:31.673 # Redis service successfully started.

5、打开 RedisDesktopManager，数量变化为 20，但是已经可以执行 SELECT 0 – 31 的命令，如图2

图2

6、删除连接，新连接设置 – 高级设置 – 数据库发现限制，其值默认为 20 ，编辑为 32，如图3

图3

7、打开 RedisDesktopManager，数量变化为 32，符合预期，如图4

图4