When used in the context of databases, memory refers to RAM directly addressable by the CPU as opposed to going through the I/O subsystem.

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5answers
679 views

MySQL runs out of memory when importing innodb database

I have a small VPS with 512MB RAM and no swap (can't have any). I am importing a 1.5GB innodb database with mysql -u -p < database.sql Before the operation can finish it says : Lost connection ...
2
votes
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 ...
0
votes
2answers
117 views

SQL Server 2012 Very Slow to Consume Memory

I have a bit of a conundrum. I recently upgraded a ~20gb database from Window Server 2008 R2 || SQL Server 2008 R2 to Window Server 2012 || SQL Server 2012. The previous server had 32gb of memory, ...
0
votes
1answer
50 views

Performance of MySQL BLOB fields processing

Suppose, I have large (about 1 GB) strings in ASCII encoding. I have to choose whether to store them as separate blob fields or split each one of them into smaller pieces and then store them as ...
0
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1answer
88 views

Lowering MySQL Memory Usage without Restart

We are using Percona Server 5.5.35-rel33.0-611.precise with InnoDB in our production server. Recently Mysql memory went high and it did't drop from there. We are afraid whether it would result in OOM ...
0
votes
1answer
121 views

MySQL over total memory allocated usage? memory leak?

i'm using 5.6.21-70.0 for performance test. when i run mysqlslap -a --concurrency=40 --number-of-queries 1000 --iterations=500 --engine=innodb --debug-info -utest -p do some performance test ...
0
votes
1answer
153 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). ...
0
votes
1answer
60 views

InnoDB compression: memory usage

InnoDB offers table compression for Barracuda-type tables and the recommendation seems to be to "adjust" buffer_pool_size. The documentation is rather vague about the definite impact of compression on ...
0
votes
1answer
317 views

Does MySQL load the entire row into memory, or just the columns used in WHERE, ORDER BY and GROUP BY?

I have a table that isn't very large row wise (in the 100ks range), but that contains a lot of raw data that is very large in size. Despite having a relatively little number of rows, it's around ...
4
votes
0answers
462 views

SQL Server Internal Memory Pressure

I am trying to identify the cause of internal memory pressure. From what I have learned, Resource Monitor Ring Buffer returns an indicator for internal pressure. For example by using this query, ...
3
votes
0answers
190 views

What are reasonable options for an in-memory multi-core database?

I'm going to preface this with pointing out that I only need somewhat persistent data. The purpose of this database platform would be to support statistical analysis in R. I usually build my tables ...
2
votes
0answers
60 views

Multi-Instance Windows Failover Cluster - Min / Max Memory Allocation Dilemma

We run numerous 2 node SQL Server 2008 R2 Failover Clusters in Windows Server 2008 R2 on a VMWare eSXi virtual platform. Each cluster hosts 3-4 SQL instances with varying degrees of memory ...
2
votes
0answers
79 views

How to raise Procedure Cache Hit Ratio?

I have a SQL Server 2012 instance with 96 GB of RAM that has the Buffer Cache Hit Ratio consistently at 100% and the PLE consistently over 500,000, so memory is obviously not a problem. However, my ...
2
votes
0answers
82 views

Find out why SQL Server released memory

I have a SQL Server 2008 R2 used for sharepoint and ssrs. The SQL Server hosts two instances. For a few minutes both instances were timing out, not responding. CPU slowly rose to 100%, 30% from ...
2
votes
0answers
349 views

mariadb out of memory crash

I have recently migrated from mysql (5.5.36 MySQL Community Server (GPL)) to MariaDB (10.0.10-MariaDB-1~wheezy), along with switching my cloud hosting provider. Both machines have 2GB RAM and 1GB ...
2
votes
0answers
1k views

“custom archiver out of memory” error when restoring large DB using pg_restore

I'm trying to a restore a local copy of a 30GB DB (with only one table) dumped using the Heroku wrappers (described here) using pg_restore. The Heroku DB is using 9.1.7 and I have had the same result ...
1
vote
0answers
10 views

MySQL Cluster 7.4.6 - Analyze table failure on 15m reference table

I'm running MySQL Cluster 7.4.6 on Azure VM's with the following infrastructure: 2 x Mgmt Nodes: Ubuntu 14.10LTS, 2 cores, 3.5GB ram 2 x MySQL API Nodes: Ubuntu 14.10LTS, 2 cores, 3.5GB ram 2 x Data ...
1
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0answers
40 views

MySQL Memory & max_connections Performance Tuning

So, our site runs WordPress and in the past few days we have been getting tons of spam comments etc. I believe that we are becoming the victims of some kind of bot army that has been crashing our ...
1
vote
0answers
548 views

What to do with unused RAM on a MySQL database server?

For years I have been running dedicated servers with more or less limited ressources, resulting in unsatisfying performance of the web application (Drupal). Tools like Matthew Montgomery's MySQL ...
1
vote
0answers
406 views

pgAdmin goes “out of memory” with large queries

I am trying to run query with results stored in file from PostgreSQL. Now I am trying to use pgAdmin for this task: running query to file option. Problem starts with large queries. When I try running ...
1
vote
0answers
3k views

MySQL server taking up 100% CPU

I'm managing a site that does streaming video, the site is running off: Intel(R) Xeon(R) CPU E31220 @ 3.10GHz 16 GB RAM 2 x 2TB RAID1 1gbit unmetered bandwidth is not an issue as the ...
1
vote
0answers
154 views

Advice to set minimum preferable value for MEMORY_TARGET

I have a server having 90GB of RAM. I have set MEMORY_TARGET to 60GB, because OEM showed me the following graph: Which tells that, if you set the parameter to the value of 60GB, the performance ...
1
vote
0answers
248 views

MySql Very Slow Writes & Out of memory error

I am having a rds db instance in AWS which is used by Drupal 7 instatllation. I am getting the below error messages in the log: > 130912 11:57:39 [ERROR] /rdsdbbin/mysql/bin/mysqld: Out of memory ...
1
vote
0answers
57 views

memcached+mysql cluster maximum memory

I'm deploying a system with memcached and mysql cluster. The command line is: memcached -E lib/ndb_engine.so -e "connectstring=maddy:1186;role=dev" I can't specify the -m argument since I used -E ...
0
votes
0answers
48 views

During Peak hours memory utilization is too high?

I am using MySQL 5.1 and its memory size is 16GB,during peak hours it consuming complete memory only 200 mb of memory were free and My database size is only 500mb as well as no long running queries ...
0
votes
0answers
33 views

mysql eating RAM without queries?

Somehow MySQL eats up 50% of my RAM on the server being used. I checked and there are no queries, show full processlist is empty. I restarted the mysqld and within a couple of minutes the RAM usage ...
0
votes
0answers
50 views

Mongo DB accessesNotInMemory issue with RAM size

I am using Mongo Replica set and it seems to be working fine but when i check db.serverStatus i saw that there are lots of accessesNotInMemory for all The DBs in my mongo instance. I checked MY RAM ...
0
votes
0answers
94 views

Why only ~half of RAM is used by Oracle on Linux server?

Why Oracle 11.2 would be using only around half of available RAM on RHEL5 box? I have 64GB but 32GB is free which really annoys me. Any memory not used is wasted memory in my books - especially on ...
0
votes
0answers
58 views

mysql memory usage increasing

We have recently been facing consistent issues with mysql memory on almost all of our machines. Through the course of the week, we see the memory rise gradually until the machine starts swapping and ...
0
votes
0answers
129 views

table_open_cache

I know table_open_cache, max_connections, and open_files_limit are related. Is there a tried and true way to set table_open_cache correctly? I have raise it three times and still MySQL Enterprise ...
0
votes
0answers
69 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 ...
0
votes
0answers
262 views

MYSQL Out of memory, table crashing

an specific table on my DB keeps crashing. I suspect to be a bad buffer setting on my.conf, it show this error before crashing (most of the time it needs to be repaired): 18:26:59 [ERROR] ...
0
votes
0answers
37 views

MySQL Cluster Disk Data Tables - worth it?

I'm working on improving the performance of our 4-node MySQL cluster for a webapp with lots of DB writes. We've got a Solr index sitting 'on top' of the SQL in order to give us fast querying, and we ...
0
votes
0answers
116 views

MySQL: What should I do if too many tables opened during peak hours?

In Peak hours: When I run below statement, I found around 100 tables out of 250 have opened. show open tables where in_use>0; There are around 10 tables for which in_use value are >50. Storage ...
0
votes
0answers
61 views

innodb fulltext Table handler out of memory

I am running mariadb 10 and have a large innodb table with a fulltext index. When searching I am regularly getting this error ERROR 128 (HY000): Table handler out of memory Is there some way I ...
0
votes
0answers
41 views

Single query consuming most memory on server intermittently

Periodically, my SQL Server 2008 DB will come to a crawl because most of the connections are in memory wait. When I query the memory_grants DMV I see that three connections have been allocated ~33% of ...
0
votes
0answers
133 views

Memory Issue - SQL Server 2008r2

I am trying to troubleshoot a memory issue on a 2008r2 instance. Very high resource semaphore waits are present and a general slowdown of queries,backups,dbcc checks. Only one instance of SQL Server ...
0
votes
0answers
81 views

MySQL: What are the pros and cons of running with engine=Memory vs on a memory-mapped filesystem?

What is the difference (in terms of read and write perf, alter tables, backup and recoverability and consistency) of running a MySQL database on a memory-mapped filesystem vs with ENGINE=MEMORY
0
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0answers
78 views

Set max memory lower than minimal

I dont know the best way to fix that, but for lucky now I am using one Transactional Replication Repository server, please someone can save me? The main server is down beacuse I set the max memory to ...
0
votes
0answers
141 views

How much RAM do I need?

Let's assume a query like the following as typical: select A.`date` as `date`, count(*) as N from A as A join B as B on B.id = A.b_id join C as C on C.id = B.c_id join D as D on D.id = ...
0
votes
0answers
85 views

MySQL overtaking system memory and forced to restart

I'm facing a frustrating issue. I have a MySQL Server 5.5 running on top of Ubuntu Server 12.04.3 LTS (VMWare guest w/ 16GB RAM - 8 Cores) mysqltuner.pl says [OK] Maximum possible memory usage: ...
0
votes
0answers
220 views

After RAM upgrade on 32-bit Oracle server, ORA-04031: unable to allocate x bytes of shared memory

We are in the process of upgrading our Oracle database server at work, from SUSE Linux Enterprise Server 10.4 / Oracle 10g / 4GB RAM (Intel 32-bit) to Scientific Linux 6.4 / Oracle 12c / 8GB RAM ...
0
votes
0answers
80 views

MongoDB RAM requirements doubt

I have a data file with 100 million documents. The number of documents is expected to always remain between 100 million and 200 million for atleast a year. I have 15 GB Ram. Currently the update ...