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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Oracle SGA memory areas [on hold]

Why is it that when we startup Oracle instance we get four SGA areas listed (refer to figure), but when looking at Oracle documentation on Memory Architecture there are six respective sections, ...
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7 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 ...
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1answer
64 views

PostgreSQL replication with fsync disabled?

I need to run PostgreSQL in-memory (for performance reasons), so I intend to disable fsync, which means that no writes will be sent to the WAL. However, as part of my scheme to meet another ...
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1answer
199 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 ...
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1answer
33 views

Storing not very volatile information in database with cache or mongodb

For a new project I'm working on right now I was doubting on which database/storage system to use for specific information which does not change that often. We have for instance some ...
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0answers
20 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 ...
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1answer
23 views

Do threads in cache still use memory?

I was studying about how and how much memory allocated to each connection thread and found below MySQL tutorial: http://dev.mysql.com/doc/refman/5.1/en/memory-use.html There is a point mentioned as ...
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30 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 ...
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1answer
27 views

PostgreSQL complaining about shared memory, but shared memory seems to be OK

I've been performing kind of intensive schema dropping and creating over a PostgreSQL server, but now complains..: WARNING: out of shared memory ERROR: out of shared memory HINT: You might need to ...
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1answer
675 views

SSIS Memory allocation

Is SSIS subject to the maximum memory limitations for SQL Server 2012 Standard edition? If I have a server with 128GB RAM and I allocate 64GB of RAM to SQL Server does SSIS utilise this memory or ...
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2answers
399 views

Redis takes up all the Memory and Crashes

A redis server v2.8.4 is running on a Ubuntu 14.04 VPS with 8 GB RAM and 16 GB swap space (on SSDs). However htop shows that redis alone is taking up 22.4 G of memory! redis-server eventually crashed ...
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2answers
933 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 ...
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2answers
331 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 ...
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1answer
94 views

AWE to allocate memory in SQL Server 2008 Express with Advanced Services

I am running SQL Server Express Edition with Advanced Services on Windows Server 2008 Enterprise 32 bit OS. I have enabled "Use AWE to allocate memory" on the SQL Server, but I am not sure if this ...
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2answers
364 views

Is there a way to enable MariaDB MEMORY storage engine for every table?

I am new to MariaDB and interested in using it because I want to use MEMORY storage engine for every table. I read MEMORY storage engine on mariadb.com and it seems like I had to specify storage ...
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3answers
118 views

Large RAM use after import database - ubuntu server

My new VPS has 4GB of RAM. Before importing database system use about 1.2 GB of RAM. When I import into the database, using 250 MB SQL file, 25000 tables use of RAM goes to 97%, htop showing 3302 mb ...
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37 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 ...
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1answer
43 views

How Does Max Server Memory Affect PLE on a Host That Is Not Memory Bound?

I came across an unusual scenario on an instance where only half the physical RAM was being utilized but I was observing PLE values between 1-3 seconds constantly. Windows Server 2003, Enterprise ...
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1answer
28 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 ...
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2answers
99 views

Seeking help to test a use case on sql server memory

This is a question which came out of curiosity to know of how sql server handles memory. Assume I set a very low value for max server memory and I increase my workload like running dbcc checkdb, ...
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1answer
6k views

Quick look at how much RAM is allocated to SQL Server?

With SQL Server 2005, you could look at the Task Manager and, at least, get a cursory look at how much memory is allocated to SQL Server. With SQL Server 2008, the Working Set or Commit Size never ...
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86 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 ...
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1answer
158 views

MySQL RDS Instance eating up memory and swapping

I have an issue with memory on a RDS instance which is of db.m2.4xlarge class. Below are the specifications of the RDS instance Instance Class: db.m2.4xlarge ( 68.4 GB of RAM ) Engine: ...
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3answers
97 views

Oracle monitor tool [closed]

Our Oracle server continues with out of memory problem, and we don't have an Oracle DBA in our team. Is there any Oracle monitor tool or ways to find the reason? We have a lot of stored procedure ...
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22 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 ...
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15 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
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1answer
78 views

MySQL 5.6.17 running out of memory when opening table with many partitions

We are currently setting up a MySQL database (version 5.6.17) on an Amazon db.m1.large RDS instance for storing time series data. Each time series property of an object is stored in a separate InnoDB ...
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1answer
56 views

Wordpress blog where pages are almost-always served from cache: SSD or more RAM?

I am working on the design of a Wordpress blog which when finished will almost-always serve pages from disk cache and this is because all posts will be published in batch and then cached, with at ...
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2answers
376 views

MySQL memory usage issues?

I have a MySQL instance running on my Ubuntu server that is eating up most of the memory on the machine. I currently have 2 GB of ram installed on the machine, and MySQL is using 1983 MB. Most of my ...
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1answer
54 views

MonetDB ODBC driver memory allocation error on Windows

The driver is the latest from a month ago: 2014-SP2: 11.17.17, 64-bit. Windows is Server 2012. I have limited options to test whether earlier versions of the driver would work or this version works ...
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4answers
265 views

Large table with historical data allocates too much of SQL Server 2008 Std. memory - performance loss for other databases

Based on this question and the answers given: SQL 2008 Server - performance loss possibly connected with a very large table I have discovered memory allocation problem with SQL Server 2008. ...
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3answers
4k views

How long will a temporary MEMORY table persist if I don't drop it (MySQL)

I'm using a recursive stored procedure in MySQL to generate a temporary table called id_list, but I must use the results of that procedure in a follow up select query, so I can't DROP the temporary ...
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4answers
10k views

tuning postgresql for large amounts of ram

I have two identical servers (in terms of hardware), they are both standard installations of windows server 2008 r2, with minimal software installed (basically my code and required stuff like jvm ...
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1answer
71 views

SQL Server 2012: NUMA node shown as offline without special affinity settings

My main production server has four NUMA nodes with two SQL Server 2012 instances on it. One of the instances has the CPU affinity set to use only one NUMA node, and sys.dm_os_nodes reflects that ...
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1answer
72 views

What should I consider before I upgrade my SQL Server memory? [closed]

I want to upgrade the memory in my SQL Server. What should I check first? Version: SQL Server 2012 64-bit Standard edition
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2answers
169 views

SQL Server 2008 R2 memory issue

I have read many posts regarding the memory but still its not clear. I have dedicated server SQL Server 2008 R2 with Windows 2008 R2, 32 GB RAM, 2 6 core processor and a database of around 60 GB on ...
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1answer
92 views

SQL Server 2012 Unable to Utilize Defined Amount of Locks

So I've been beating my head against the wall for two days about this and I can't find a solution. I'm running a script to stage a large amount of data. This script requires roughly 35 million locks ...
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1answer
28 views

What is a construct in Oracle?

I'm currently studying Oracle Architecture and Database Memory Structures. I'm a newbie in the subject and I just read that a "Shared Pool" is "a data structure that caches various constructs that can ...
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1answer
316 views

Understanding pagefile.sys % Usage performance monitor (perfmon) counter correctly

Lately we run into performance inssues and I started tracking some recommended sql, memory, disk and cpu counters. I informed myself about the recommended values and numbers to look at. One of the ...
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2answers
171 views

When should I NOT set the Maximum Server Memory option in SQL Server?

In SQL Server, I normally set the Maximum Server Memory setting to one of the popular best practices, such as leaving 10% or 4GB, whichever is higher. ...
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1answer
98 views

MongoDB page faults even when all data is in resident in RAM

I have made a sample app that emulates what my real one does. It simply iterates over all documents of a specific collection over and over. I start mongo (as a windows service) and mongostat shows ...
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3answers
7k views

What are reasons *not* to use the MEMORY storage engine in MySQL?

I recently discovered that MySQL has a "memory" engine that I wasn't aware of (most of my database work is for hobby projects so I learn what I need as I go). It seems like this option should give me ...
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0answers
147 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 ...
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1answer
128 views

Recurring Memory Issues

We have a Windows Server 2008R2 server with 32GB or RAM running SQL Server 2008R2, along with an IIS server. The machine is also used as a backup server. The problem is, periodically (every week or ...
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1answer
58 views

Postgres resource management

I'm consolidating multiple Linux boxes running Postgres into one box. Given the way Postgres handles resource utilization, would one single server service handling all the databases provide a much ...
2
votes
1answer
47 views

Could 'Maximum Server Memory' be too low for large batched delete with captured output?

I'm trying to improve the performance of a SQL server database backup program that will create a new database to hold one years worth of report records, delete report records out of the main database, ...
6
votes
2answers
18k views

How do I shrink the innodb file ibdata1 without dumping all databases?

InnoDB stores all tables in one big file ibdata1. After dropping a big table, the file is keeping its size no matter how big the table was. How can I shrink that file without having to dump and ...
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0answers
257 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 ...
5
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2answers
358 views

How to determine when to reduce physical memory for SQL Server?

If I repeatedly notice SQL Server reporting a lot of free memory, can I likely remove about that amount of memory from the server without affecting performance? Or, can/should it use more for caching? ...
5
votes
1answer
152 views

sql server instance using only a few 100mb. Well below the minimum server memory setting

I've got two sql server instances running on ms sql 2012 on a server with 32gb of RAM and running little else. One instance is behaving normally and its working set memory is running close to its ...