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How big is the buffer pool in InnoDB?
Your innodb_buffer_pool_size is enormous. You have it set at 20971520000. That’s 19.5135 GB. If you only have 5GB of InnoDB data and indexes, then you should only have about 8GB.
How big should the chunk size be in InnoDB?
Chunk size is defined by the innodb_buffer_pool_chunk_size configuration option, which has a default of 128M. For more information, see Configuring InnoDB Buffer Pool Chunk Size . Buffer pool size must always be equal to or a multiple of innodb_buffer_pool_chunk_size * innodb_buffer_pool_instances . If you configure innodb_buffer_pool_size
How to resize the buffer pool in MySQL?
[Note] InnoDB: completed to resize buffer pool from 4294967296 to 134217728. [Note] InnoDB: re-enabled adaptive hash index. The resizing operation is performed by a background thread. When increasing the size of the buffer pool, the resizing operation:
How to calculate chunk size in MySQL 5.7?
For example, if the buffer pool is initialized with a size of 2GB (2147483648 bytes), 4 buffer pool instances, and a chunk size of 1GB (1073741824 bytes), chunk size is truncated to a value equal to innodb_buffer_pool_size / innodb_buffer_pool_instances , as shown below:
How big should be MySQL’s buffer pool size?
The database runs on a Debian server using SSD disks and I’ve set max connections = 800 which sometimes saturate and grind the server to halt. The average query per second is about 2.5K.
What should MySQL cache size be for 8GB RAM?
That would be 62.5% of RAM with a sufficient amount of RAM for the Server OS plus memory for DB Connections @kvisle recommended using mysqltuner.pl. That script is excellent for judging the amount of RAM to dedicate to join_buffer_size, sort_buffer_size, read_buffer_size, and read_rnd_buffer_size.
How many InnoDB log files should I use?
While it is possible to use multiple innodb log files, two usually works best. However, in all fairness, someone from the original InnoBase Oy company expressed not using the 25% rule because of having larger InnoDB Buffers Pool. Naturally, the 25% rule cannot work when having huge amounts of RAM.
How long does it take to initialize a buffer pool?
The time to initialize the buffer pool is roughly proportional to its size. On large installations, this initialization time may be significant. For example, on a modern Linux x86_64 server, initialization of a 10GB buffer pool takes approximately 6 seconds. See Section 8.9.1, “The InnoDB Buffer Pool”.
Currently, we allocate 6GB of RAM for the buffer pool. Our database size is about the same. Here’s the output from show engine innodb status\\G (we’re running v5.5)
Can you use InnoDB if the pool is too small?
InnoDB is using it, it doesn’t do anything without it. If the pool is too small, pages get evicted and new pages get read in and the other stats help you understand that… but that is problem you don’t appear to have.
What is the size of the buffer pool?
The Buffer pool size 393215 This is in pages not bytes. Database pages 360515 This is the number of pages with data inside the Buffer Pool Modified db pages 300 This is the number of pages in the Buffer Pool that have to be written back to the database.
I tried to separate the webserver and mysql server. MySQL server = 16GB RAM and the config of Innodb_buffer_pool_size = 10GB. And my Web server = 4GB RAM
Why is MySQL not allocating memory for the buffer pool?
The InnoDB memory heap is disabled. This isn’t really an error, just an indication that InnoDB is using the system’s internal memory allocator instead of its own. The default is yes/1, and is acceptable for production.
How much memory do I need for the buffer pool?
If so, then 10GB for the buffer_pool should be fine for a mysql-only server with 16GB of RAM. Something is hogging memory. It could be: