[tcapulusdb knowledge base] manually view the online operation of tcapulusdb

[TcaplusDB The knowledge base ] View manually TcaplusDB Online operation

As an operator , One of my daily tasks is to check the overall situation of the database , Ensure that the background is running normally , Now let's briefly introduce how to check the situation .

Find one tcapsvr machine , Get into tcapsvr Of control Pattern ( Such as ：/data/tcaplus/tcaplus_service/bin/*_*_*_*/tcapsvr --id=*.*.*.* control), here *.*.*.* yes tcapsvr The process of id,

Then input StatusX, enter , View Book tcapsvr All that's managed shard Information （ You can see appid zoneid tablename shardid, Record number ）, And then use PrintEngineStat Appid Zoneid TableName Shardid, enter , You can see the output of the following screenshot

The following represents the use of tofu pieces , Such as

KeyNums[0] = 368951, On behalf of 368951 Bar record Key Part of it takes up 1 A piece of tofu , Subscript from 0 Start

valNums[1] = 60332, On behalf of 60332 Bar record Value Part of it takes up 2 A piece of tofu , Subscript from 0 Start

valNums[2]=52272, On behalf of 52272 Bar record Value Part of it takes up 3 A piece of tofu , Subscript from 0 Start

By analogy

The optimization idea is to make Key Value Every time I read and write, I use the least io operation , But don't just increase the index to make all key value Just one piece of tofu , Will cause memory 、 Disk resource waste , Like a piece of tofu 4K, But the average size of the record is only 256 byte , Every record stored is wasted 3.75KB

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TcaplusDB It's a distributed product of Tencent NoSQL database , The code for storage and scheduling is completely self-developed . With cache + Landing fusion architecture 、PB Levels of storage 、 Millisecond delay 、 Lossless horizontal expansion and complex data structure . At the same time, it has rich ecological environment 、 Easy migration 、 Extremely low operation and maintenance costs and five nine high availability features . Customer coverage game 、 Internet 、 government affairs 、 Finance 、 Manufacturing and the Internet of things .