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3
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1answer
125 views

dbcc memorystatus - buffer pool target on VM higher than max memory

I'm doing some digging into potential memory/configuration problems on a sql server 2012 SP2. I stumbled upon something that seems a bit strange in the performance counters as well as the dbcc ...
0
votes
0answers
32 views

mysql uses a lot of virtual memory

I've a mysql server with a lot of small size innodb databases (each db also contains a lot of small tables) & 6GB of RAM dedicated to mysql server. Recently I've increased my ...
1
vote
1answer
20 views

Does InnoDB Log Files take RAM space or Disk Space

When I set InnoDB Log File size to 512M, does it take the space (512M * 2) from RAM or the SSD Disk space? When I explored, I can see that the log files are located inside /var/lib/mysql folder. So ...
0
votes
1answer
67 views

mysql innodb_buffer_pool_size let me understand

I couldn't find answer for my situation. I have a windows server 2008 with 2 cores and 7 GB RAM (Azure D1 VM). I'm running mariadb 10.0.14 on it. I have 2 databases (1.5GB and 9GB in size). ...
1
vote
1answer
15 views

“Approximately equal” between Sync and Async operations for PageCleaners

The documentation of num_iocleaners says: The parameter can be reduced if both of the following conditions are true: pool_data_writes is approximately equal to pool_async_data_writes ...
1
vote
1answer
443 views

InnoDB Buffer Pool Hit Rate

As given at http://cherry.world.edoors.com/COBFKUqnUdBY one can obtain buffer hit ratio by following sql query: SELECT round ((P2.variable_value / P1.variable_value),4), P2.variable_value, ...
1
vote
1answer
37 views

InnoDB buffer pool active pages

I'd like to optimize (lower) the InnoDB buffer pool size. How can one find out how many distinct pages are active in the InnoDB buffer pool? A page could be made young twice in a while (see SHOW ...
1
vote
3answers
134 views

Will redirecting queries to dev/null warm up indexes?

I'm trying to warm up the buffer pool. Will running a query and re-directing the output to /dev/null suffice? e.g. mysql -u username -p -e "select id from tbl where 1=1" > /tmp/results.txt Thanks
2
votes
0answers
197 views

Empty Space in buffer pool

I was doing some reading and came across this article from Paul Randal: http://www.sqlskills.com/blogs/paul/performance-issues-from-wasted-buffer-pool-memory/ Using the queries from that article, I ...
0
votes
1answer
291 views

DB2 - How to estimate proper BUFFERPOOL size?

DB2 9.7. 8GB RAM on server. Currently BP has 500 MB (number of pages*pagesize) Database has issue with increased IOPS. So we think maybe BP should be increased. How to estimate needed size for BP? Is ...
3
votes
3answers
3k views

Making sense of INNODB buffer pool stats

After having read this page in the mysql documentation, I tried to make sense of our current InnoDB usage. Currently, we allocate 6GB of RAM for the buffer pool. Our database size is about the same. ...
3
votes
2answers
118 views

optimal size of innodb buffer pool

I read a lot of optimal number of innodb_buffer_pool_size and people say it must be larger with 10% than the innodb tables size, what is 60M. Accordyngly this the optimal size of the buffer is about ...
0
votes
2answers
8k views

How to set Innodb Buffer Pool Size [duplicate]

I have a database using innodb completely. Its now having a innodb_buffer_pool_size at 128MB. Which I know is very less for my user. But no matter what I do it won't change. I have added a value of ...
1
vote
2answers
506 views

MySQL stores BLOB in innodb buffer pool (innodb_buffer_pool_size)?

I have several databases all in INNODB, 50GB are BLOB columns, only 700MB are not BLOB data. Tools as mysqltuner ask me to set innodb_buffer_pool_size = 51GB. Does MySQL store the BLOB in RAM? If ...
3
votes
1answer
521 views

Finding swap causes of MySQL

In my centos 6.3 server I have a MySQL 5.5.33 database. It has 17 tables (15 InnoDB, 2 MyISAM) and total records 6.7M rows. I refactored my schemas and added indexes for my slow logs. My average query ...
0
votes
1answer
1k views

DB2 LUW: Should temporary tablespaces share bufferpools with other tablespaces?

We are in the process of tuning a massive application our company has just written. Part of that tuning includes tuning the databases. We run DB2 LUW on AIX. Specifically we are at 9.7 Fix Pack 4 ...
1
vote
2answers
1k views

Why would increase in innodb_buffer_pool_size slow down MySQL?

5.1.68-cll - MySQL Community Server on CentOS The system has 32GB of RAM. I increased innodb_buffer_pool_size from 10240M to 15360M (10GB -> 15GB). Time taken for a series of identical operations ...
4
votes
1answer
256 views

Buffer usage for index with no reads

Using SQL Server 2008 R2, the main transactional table in a vendor database is massive compared to all others and has about 14 indexes. Some of these indexes don't get used in our environment, but we ...
2
votes
1answer
675 views

How to create Buffer Pool in Database dedicated only for ONE BIG table?

I have table TICKET with 400K records in database (DB2). I wish to create one huge buffer pool which will be dedicated only to this one big table for faster response. What are the steps to do it? ...
2
votes
0answers
216 views

tempdb objects creator wanted, bufferpool issue caused by tempdb objects

I have a number of tables in tempdb named like #A0030B77 #A01D908C #A06D1FCB #A0F72FB0 #A1614404 #A1EB53E9 #A205D8FE #A255683D How (if) can I get spid of the process which created them? These ...
1
vote
1answer
235 views

Should indexes automatically be placed into their own bufferpool?

We work with DB2 LUW (specifically we are currently on 9.7 FP4) running on AIX. Per best practices from IBM, they recommend that when you build a table, you place the data, the indexes, and LOBs/LONG ...