Splitting a database table into multiple segments for performance or manageability.

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Adding Partitions to an Existing Filegroup

For maintenance reasons, the organization that controls the servers where I work has decided to limit the number of file groups and files for partitioning to just 1 of each. Their reason for this is ...
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2k views

Partitioning a Table Referenced by a Foreign Key

I have one table: CREATE TABLE [dbo].[entry] ( [ID] [bigint] IDENTITY(1,1) NOT NULL, [EntryDate] [datetime] NOT NULL, [createddate] [datetime] NOT NULL, CONSTRAINT [PK_Entry_ID] ...
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Is it best practice to include partition keys within foreign keys when referencing partitioned tables?

The large tables in our database are partitioned by an id in order to separate data and speed up IO. The table of the data is partitioned by the partition key, but the primary key is only on an ...
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mysql - is it possible to create a partition expression based on two keys / indexes?

if i have a table with, lets say 500 million rows, and among others there are two main individual indexes on that table. the table looks like: CREATE TABLE `t1` ( id_1 bigint unsigned not null, ...
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28 views

Obtaining the next partition number

For a partitioned table, how do I determine via T-SQL what is the next partition number that will be used? For example, the switch-in today went into partition number 50. I want to build the new ...
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375 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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151 views

Copying a table with its structure, indexes, and associated triggers?

I have studied this post on Stack Overflow: Fastest way to copy a table in MySQL. But no answer is copying everything like the table's structure, data, indexes as well as associated triggers. Is it ...
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60 views

How do triggers work on partitioned tables?

I have partitioned a table on the basis of a column. This column can either have 0 or 1. So, only two partitions (p0, p1) have been created internally. On this table there are 3 triggers which execute ...
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189 views

SUM() the result of a stored procedure

I use the Pl/Proxy extension in order to shard a table. It works like a charm, except for this : I have a stored procedure which runs on 4 shards. It looks like this : CREATE OR REPLACE FUNCTION ...
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1answer
113 views

Is there a difference between RANGE and LIST method for partitioning by consecutive integer values?

I have a table with a year column that has consecutive values -- 2000, 2001, and so on. It's a read-heavy MyISAM table, with 25+ million rows for every value of year and a comparable set inserted in ...
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131 views

Paritioning performance for full table scan on non-paritioned index

We have a table in Postgres that we are considering partitioning. We occasionally query an indexed field that is separate from one with the partition key. My question is: Can partitioning the table ...
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204 views

SQL Server : ALTER TABLE tablename SWITCH PARTITION 2 to tempempty

Have a sliding partition where I need to remove the trailing partition when they expire. I create an empty table that matches the existing table. When I create the empty table, I specify the file ...
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Are we a good fit for SQL Server Enterprise and table partitioning?

We currently have a production database that contains millions of records (14 million in the largest table). One function of the database is to provide time sheet information so a single table could ...
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18 views

Incorporating Partition Views into a Data Warehouse

I've read some material on how to accomplish this but I want to validate it before proceeding. My understanding is that you: 1) Define the table that we want to add into the partition with the ...
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2answers
3k views

How to remove a table partition

I would like to remove a partition from a table in a SQL Server 2012 database. The table has a primary key but the partition column is not a primary key. I would also like to keep the data structure ...
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How Does Table Partitioning Help?

I am having difficulty to grab the idea of pros and cons of table partitioning. I am about to start work on a project which would have 8 tables and one of them will be the main data table which will ...
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202 views

How can I interpret the results of these DMVs to help me evaluate our partitioning strategy?

Version: SQL Server 2008 R2 Enterprise Edtn. (10.50.4000) In attempt to evaluate our partitioning strategy, I wrote this query to get the access methods against indexes on partitions (in the broadest ...
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590 views

Partitioning MySQL vs PostgreSQL

For our new system we are looking for database server. We considered a lot of pros/cons for MySQL(InnoDB) vs PostgreSQL and the breaking point for us is partitioning. We will choose the one which ...
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63 views

Want to create partitions of a MySQL table and change the charset of new partitions

I have a database table which contains large amount of data. I have written a script to create new partitions every week and drop old partitions (which are of no use). Currently, I have a column in ...
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2k views

ALTER TABLE … SWITCHing from regular table to partitioned table fails

The code below does the following: Creates a database play_partition in C:\TEMP Creates two identical partitioned tables play_table and archive_play_table Switches play_table partition 1 to ...
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55 views

Sharding TPC-C Benchmark with MySQL Fabric

Currently I have a setup of 5 mysql database nodes (db01 ~ db05). MySQL Fabric and backstore have been installed and running in db01. I configured one global_group (i.e. group_02) with db02 and three ...
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1answer
28 views

remove a paritition table

I need to remove a partition table for an application upgrade. It is SQL Server 2008 R2. The partition column is on column col1 data type smallint, null. Col1 has length 10 and precision 5. As you ...
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1answer
654 views

Is DBCC SHOWFILESTATS an accurate way to see unused space?

We have a few tables each with near 100 million rows of data. A co-worker has these tables setup with partitions based on a date field. Our disk space is starting to run low and knowing that ...
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237 views

PostgreSQL partition pruning?

In postgres partition is done by child tables. My problem are, when we issue a query to master table , does the query optimizer do partition pruning ? i.e select appropriate child table rather than ...
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1answer
449 views

Partitioning large mysql table

I have a large (40GB) table I would like to partition. The rows are essentially write once read many. Currently I am using mysql 5.5 innodb with file_per_table. It's tough to optimize this table since ...
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33 views

Are there any inherently non-partitionable datasets?

Are there any practical datasets that, by their nature, cannot be partitioned in any practical way? I am wondering about this because such datasets would be ill-suited to scaling out on commodity ...
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491 views

Oracle Partition Table Space Issue

I have a table with list partitions on it. When i insert data i see that all the partitions have default initial size of 8 MB and I also noticed that when i truncate full table and check size it still ...
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80 views

Best Practice in storage allocation for compressed and partitioned tables

I have a fairly large database that basically consists of one table, this table is paritioned by month and all partitions are compressed with page compression. After the initial load of the data there ...
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46 views

Modulus calculation for compound primary keys in MySQL Cluster (and other sharded databases)

In MySQL Cluster, and generally in sharded databases, how is a compound primary key's modulus calculated? Say, for example, there are two tables that have primary keys like so: CREATE TABLE Orders ...
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52 views

MySQL 5.1: How to rollback partitioned table

I have partitioned a table on the basis of one flag column have value either 0 or 1. Now, I want to roll back these tables. How can I do this?
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178 views

Drop partition scheme with orphan indexes

I have a partition scheme in my SQL Server database that I am trying to drop. This scheme was used by 2 indexes, which I deleted. I can't delete the scheme, since it appears to still be used by the ...
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1answer
89 views

What is a “leaf expression”?

What is a "leaf expression"? Partition-clause expressions are limited in the following ways: Your partition-clause must calculate a single non-null value for each row. You can reference multiple ...
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111 views

Oracle DB - Is it possible to distribute data of a table onto multiple servers?

BigTable[1]-like systems (HBase[2] for instance) allows a table to be distributed transparently accross multiple servers. This works as follows: Each server perform the read/writes operations on ...
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194 views

How to split the Wordpress database?

FYI - I originally posted this question under the Wordpress Development site here: http://wordpress.stackexchange.com/questions/145861/how-to-split-the-wordpress-database I have a site that is used ...
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102 views

Greenplum's poor dynamic partition elimination

I have large fact tables in Greenplum with many years of history that are partitioned by a surrogate key (which represents time). Of course almost all queries are for recent time periods where the ...
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31 views

whether to merge partitioned table with only partially overlapping columns

I opted for MonetDB for my static data, but this might be less of a MonetDB-specific question about features than about RDBMS (or just SQL) in general. I have data with a few "cross-sectional" ...
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1k views

How to get accurate row counts in partitions in a table

I am trying to fetch row counts in each partition for a table. But I got confused as in sys.partitions row counts is on basis of indexes. So how can I get exact row count for partitions in a table.
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Does partitioning sometimes require denormalization?

Specific example of what I'm asking: Say that a SaaS app has an Order table with CustomerID and a child OrderItem table. We want to partition both tables and we want to use CustomerID as the ...
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dynamic sql: merge partitioned tables (annual tables into a single table of all years)

I need to merge (UNION) data from annual tables into one large table. I am confused about how dynamic SQL (or else) should be used for this. Below is an updated version of my question on ...
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643 views

Strange behaviour with MySQL 5.1 TO_DAYS partitioning schema

I have this table definition: CREATE TABLE `va_ventas` ( `ID` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT, `Date` DATE NOT NULL, `Time` TIME NULL DEFAULT NULL, `Country` VARCHAR(3) NULL DEFAULT NULL, ...
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46 views

How does partitioning and the lack of a primary key affect ON DUPLICATE KEY UPDATE

Consider a table with the following columns: phone BIGINT NOT NULL PRIMARY KEY, name VARCHAR(64), state VARCHAR(64) We would like to partition the table on state, however that would require ...
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2answers
541 views

Creating a partition on my soft-delete indicator column

In SQL Server 2008 R2 I am exploring the use of partitioning tables. We have a soft-delete scheme which is sometimes an IsDeleted bit NOT NULL and sometimes a DateDeleted date NULL I want to focus ...
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3k views

Database partitioning - Horizontal and Vertical sharding - Difference between Normalization and Row Splitting?

I am trying to grasp the different concepts of Database Partitioning and this is what I understood of it: Horizontal Partitioning/Sharding: Splitting a table into different tables that will contain a ...
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1k views

Is table partitioning improving performance? Is it worth it?

I have just been involved in a project on which I will have to develop a data migration process and a web interface that uses an already existing SQL Server DB. This DB was developed by another person ...
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Oracle tables partition related

Here is my doubt. Is it possible to apply a partition to one table depending in the partitions values of another one? Why I am asking? I have one table where information headers are persisted, and ...
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1answer
1k views

How to take partitions or filegroups out of service

I'm an experienced SQL Server DBA but new to partitioning, and I have a couple of questions. Using SQL Server 2008 R2 Enterprise Edition. I've inherited a large customer metrics database that grows ...
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70 views

Partitioning a table state

So far I always used date ranges to partition my tables, however now I like to do it by state or a selected list of cities where all others that are not explicitly listed in an "other" partition, is ...
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What are the possible risks involved in partitioning large database tables? [closed]

There has been much talk about the benefits of table partitioning in Relational DBMS. I would like to know: Are there any risks to table partitioning ? What measures are there to take to minimize ...
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1answer
80 views

What inefficiency does sharding & partitioning attempt to address? [closed]

I have never implemented sharding or partitioning, but from what I understand, multiple servers are used to distribute large amounts of data. Is this because of a limited hardware budget or to ...
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3answers
1k views

Best practices for configuring the Drive/Filegroup setup for Microsoft SQL 2008

I am a software developer for a small company. I wish we had a dba but not in the cards at this point for this company. I was working on migrating our 75gb SQL Server 2000 database to SQL Server 2008 ...