…InnoDB buffer pool size is set to 6G and the buffer pool was warmed up, so that the relevant pages were already loaded in the buffer pool…how effective are the join optimizations when the workload is IO bound. For the purpose of benchmarking IO bound workload, the InnoDB buffer pool…
Post: Multi Range Read (MRR) in MySQL 5.6 and MariaDB 5.5
March 21, 2012 By 10 Comments
…, the InnoDB buffer pool size is set to 6G and the buffer pool was warmed up, so that the relevant pages were already loaded in the buffer pool… Innodb_buffer_pool_read_ahead 0 20920 23669 20920 23734 Innodb_buffer_pool_read_requests 1361851 1264739 1235472 1263290 1235781 Innodb_buffer_pool_reads 120548 102948 76882 102672 76832 Innodb… Innodb_rows_read. While MySQL 5.6 is also reporting increased numbers for the counter Handler_read_key. This is because of how…
Post: Troubleshooting MySQL Memory Usage
March 21, 2012 By 3 Comments
…INNODB STATUS and look for memory information block, which can use like this: ———————- BUFFER POOL AND MEMORY ———————- Total memory allocated 132183490560; in additional pool…
Post: Choosing innodb_buffer_pool_size
November 3, 2007 By 38 Comments
… is usually much better to simply check it. Start MySQL With 10GB Innodb buffer pool for example and see how large RSS and VSZ get in “ps” output on Unix Systems. If it gets to 12GB when you need 2GB for other stuff, and you can increase it a bit to be on the…
Post: How to estimate time it takes Innodb to Recover ?
May 9, 2007 By 7 Comments
…buffer pool when recovery is complete but again this does not normally take major part of recovery time. It is worth to note Innodb… seems to be done in the background. In the future to increase recovery…to handle and crash Innodb few times to see how long it takes Innodb to recover. I’d recommend to…
Post: SHOW INNODB STATUS walk through
July 17, 2006 By 40 Comments
…innodb_log_buffer_size is optimal – if you see more than 30% of log buffer size being unflushed you may want to increase…buffer pool. Finally you can see buffer pool hit ratio which measures buffer pool efficiency. 1000/1000 corresponds to 100% hit rate. It is hard to tell what buffer pool…
Post: Heikki Tuuri answers to Innodb questions, Part II
November 4, 2007 By 13 Comments
…to increase size of your Innodb log files to be able to use a lot of memory for write buffering…to the first file in the log file group? HT: InnoDB writes the checkpoint information to the first file. Q31: How… this matter the other day – choosing innodb_buffer_pool_size Q36: There have been several …
Post: What to tune in MySQL Server after installation
September 29, 2006 By 116 Comments
…innodb_buffer_pool_size This is very important variable to tune if you’re using Innodb tables. Innodb tables are much more sensitive to buffer size compared to…to increase sort_buffer_size even if you have 64GB of memory to…
Post: The relationship between Innodb Log checkpointing and dirty Buffer pool pages
February 17, 2012 By 5 Comments
…buffer pool pages are flushed down the to the tablespace. If Innodb stops (read: crashes) with dirty buffer pool pages, Innodb recovery must be done to… on these numbers, we can determine how many bytes back in…buffers and they are hitting their max checkpoint age. The way this increases dirty buffer…
Post: When is it a time to upgrade memory ?
September 16, 2008 By 11 Comments
… as database which is less than innodb_buffer_pool_size) You will have all buffer pool busy sooner or later. How to figure out if it is… to 50 reads/sec may be because load is getting more IO bound or may be just because amount of queries increased… innodb_buffer_pool_size (while having innodb_flush_method=O_DIRECT) and see how performance depends on buffer size so you get and understanding what Memory-To…
