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

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Maintain Up-To-Date Copy of Very Large Table if Clustering/Partitioning/Moving Operation Needs to be Killed/Rollback

I've appended the following information in a previous post but I asked the 'why' instead of the 'how'. So here's the question... SQL Server 2014, CU6. 4.5 TB database, Simple recovery. The most ...
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533 views

Postgresql: Partition table by hour

I have a system that inserts several million records over the course of 24 hours. Users don't care about the data that's older than 24 hours, and typically query data over a small time frame (5 to 60 ...
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1answer
138 views

Mysql Partitions with Partition limit

I have a partition table on basis of Primary key having 1.5 Billion rows in it. But when i check ibd files only 80 ibd show in GB's whereas 120ibd shows 1MB file. I would like to know how does the ...
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51 views

Using the partition function in the Where clause

I've been asked to test out performance of a database (a test system) after implementing horizontal partitioning. The database is on SQL Server 2008 r2. I'm inheriting this from someone else and ...
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82 views

Does partitioning help if you don't query on the partition value?

Say I have an orders.Order table that is partitioned on CreatedWhen (a datetime column set to GetDate() when the row is created). The table has over 10 million rows and the partition is quarterly ...
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51 views

Best ratio for files and file groups for a highly partitioned table

I have a number of tables with exactly 1000 partitions. Each table can be up to 200G with 100M rows and cannot be compressed. Data in partitions distributed quite equally. The SQL Server has 8 ...
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1answer
78 views

SQL Server Database Table Partitioning Consideration

I have a SQL Server table with 42 million + records. This table acts as a staging area for transaction records loaded from a different system. Data from this staging table have to be transformed and ...
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108 views

MySQL table partition strange behavior (slow query suddenly)

(I asked this question in "stack overflow" and was recommended to ask in here). (MySQL version: 5.6.15) I have a huge table (Table_A) with 10M rows, in entity-attribute-value model. It has a ...
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53 views

SQL Server partitioning of many-to-many tables - triggers

Many to many tables usually have only foreign keys to related tables, like EmployeeId PositionId Is it good idea to add column only for partitioning and set its value with INSTEAD OF INSERT/UPDATE ...
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164 views

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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1answer
277 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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340 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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1answer
38 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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1answer
92 views

Mysql, sql server, oracle tables get too large [closed]

I hear a lot about things that, it is a lot cheaper to buy new harddisk than pay staff to come up with genius ideas how to save resources. But what I don't understand, is how these databases handle a ...
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857 views

Incorrect information in .frm file after a power outage?

CentOS release 6.3 (Final) x86_64 mysql Ver 14.14 Distrib 5.5.31, for Linux (x86_64) using readline 5.1 SHOW SLAVE STATUS\G: Slave_IO_Running: Yes Slave_SQL_Running: No ...
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How do I configure MySQL to store specific entire InnoDB tables on a different drive in Windows ( Server )?

After skimming the MySQL ( 5.5 ) docs on Partitioning, that seems to deal with breaking parts of the same table off onto other drives. I'm struggling to find information on how I pinpoint an ...
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How to take partitions or filegroups out of service [migration] [duplicate]

I'm an experienced SQL Server DBA but new to partitioning, and a had a couple of questions. Using SQL Server 2008 R2 Enterprise Edition. I've inherited a large customer metrics database that grows by ...
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5k views

How do I remove partitioning?

There is a table my_table which has not been created any partition in MySQL 5.6. And I'm trying to create partitions by procedure in my_table, when I run this code: alter table my_table remove ...
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1answer
178 views

Is there an advantage to moving to 'real' date partitions on MySQL 5.5?

We are using partitions per day for some our tables. We started with MySQL 5.1, so we had to partition using the to_days (end_time is a datetime column): ENGINE=InnoDB DEFAULT CHARSET=utf8 ...
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359 views

When to split a large table

I run the SQL Anywhere DBMS, and we have a table of about 10 columns(normal text, timestamps etc). However, in my use-case, every single day, the table gets 2160000 new rows. It's also crucial that ...
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119 views

MySQL Partitions

I've done a lot of work with MySQL but generally on a much smaller scale than this, so please excuse my ignorance. We've got an InnoDB table which is currently storing ~3.5 million rows, which I know ...
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300 views

How to make Greenplum 4.2.3 only scan the intended partition?

When I uses unnest() in a View, and uses that View in a select statement, Greenplum seems to fail in only searching for the intended partition and search through all the partition of the main table ...
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240 views

MySQL Partitioning, Reorganize Max Value partition (Known Bug / Feature)

I have written a crone job which reorganizes last max value partition every week into 2 new partitions , one for the previous week , and one for the future data (new max value partition which ...
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Partition guides and possible solutions?

We have a table called tblLink which is the main table and have its primary key in many other tables as shown below. The issue now we want to keep only the latest 3 months data and the rest should be ...
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106 views

Basic PARTITION question in MySQL

Say I have an application using MySQL and at some point decide that implementing Partitions on certain tables might improve performance. Would I need to change the applications select statements ...
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1answer
53 views

How to keep archive table accessible for some users which is not frequently accessible?

I have partitioned my table based on some boundary ranges. My Database is built at MSSQL server 2008 R2. I have done partitioning for a table which has 40 million records in it. Now it's time to ...
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1k views

Difference between partitioning and fragmentation [closed]

I'm trying to learn something about distributed databases and I stumbled upon the concepts of fragmentation and partitioning. It seems to me as if both do the same thing and produce similar results ...
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2answers
749 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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2answers
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MySql - partition by range and unique key

i'm trying to create the following table: CREATE TABLE `s_relations_with_partition` ( `id` int(11) NOT NULL AUTO_INCREMENT, `source_persona_id` int(11) NOT NULL, `relation_type` int(11) NOT ...
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2answers
671 views

Understanding Disk Partition Alignment for Windows Server 2012 and SQL Server 2014

I am about to setup a SQL Server 2014 on a Windows Server 2012. Starting from best performance on the drive I formatted the drive with 64k allocation unit size. Now I am stuck using Diskpart to set ...
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1answer
232 views

strange situation with very large partitioning table

I have a very strange situation here... On my SQL Box there is a large Table this table is partitioned, everything was fine until I forget to make new partition ranges. in the first picture the last ...
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1answer
138 views

Maximum Partitioning PostgreSQL

I have 400,000 records I need to partition. The records will increase 100,000 per year and those new records might need to have 1000 new partitions added. Here are some of my concerns: How many ...
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82 views

Partition Function Question - DatetimeOffset

I am planning to partition a large table on [datetimeoffset]. I thought the data in that column were all yyyy-mm-dd hh:mm:ss -08:00, but there are multiple offsets in that column such as -07:00 and ...
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143 views

Constrain exclusion to fetch latest N rows

I'm managing a table with several million records which are being inserted in real time. A part of my app needs to display the last N inserted records, so at the beginning I just queried for: ...
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1answer
1k views

Msg 1833, File 'ABC.ndf' cannot be reused until after the next BACKUP LOG operation

I am having a Database. The size of my database is near about 4GB(Only .mdf file). In that database only few tables present which have the maximum data of database. One of them and the biggest table ...
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2answers
214 views

Inputs on handling large volumes of data for specific tables in SQL Server standard

I have large OLTP ERP database with 10 million records in few tables. The database size is as large as 10GB. I have few critical transaction tables like this: 1. Payments 2. Cheques etc., and each of ...
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197 views

Counting unique records across 2 columns and computing a score based on boolean values

I have a table that looks like this in Google Big Query: custID InteractionDate Purchased? Sales 1 20150312 F 0 1 20150312 T 200 1 20150314 ...
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3answers
286 views

Active/current (1-5%) and historical records in same table: index or partitioning?

I am trying to discover the correct architecture for the following situation. An application stores 'source data' in multiple tables. Each of these 'source data' tables contains actual, current, ...
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491 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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73 views

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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1answer
3k views

Unable to select the records from specific partition in mysql?

I've created a table using the following query, CREATE TABLE employees ( id INT NOT NULL AUTO_INCREMENT PRIMARY KEY, fname VARCHAR(25) NOT NULL, lname VARCHAR(25) NOT NULL, store_id ...
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1answer
40 views

How to change initial extent of an existing partition

I'm having trouble with something that should be rather simple ... I'm sure I'm missing something obvious. I'm trying to change the initial extent of an existing table partition. For some reason, I ...
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1answer
48 views

Very large subpartitions after table redefinition

I'm trying to redefine a table to be partitioned. The original table has about 1.5M rows and about 150MB size. select segment_type, segment_name, bytes / 1014 / 1024 as SIZE_MB from user_segments ...
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MySQL : How do I partition based on Month of date

I have a table having id as primary key and date column. I want to partition the data.. I felt month would be the best option so that I have 12 partitions.. How do I achieve that ! I am using mysql ...
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1answer
117 views

postgres fetch record from partitions without the check constraints

I am using postgres 9.4, I have a messages table that has 100M records, messages belongs to one feed_id, so I decided to partition the tables by posted_at. Table "public.messages" ...
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1answer
577 views

How to split a MySQL table file?

I have a table in a MySQL database for which innodb_file_per_table is enabled. One of my tables is about 20GB and growing. How can I partition the table into separate files? Suppose that I have a ...
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62 views

Help with optimising a sql query on two partitioned tables

I have a SQL query that I am running on two very large tables in SQL Server 2012 Enterprise The two tables are ACKs and Logs. Both are partitioned on their time by day column with the appropriate ...
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1k views

Efficient way to DELETE whole partition's data in table partitioned by HASH(DAY(datetime))?

I have a MySQL InnoDB table PARTITIONed by HASH(DAY(dateTime)). I'd like to remove partitions holding data older than 10 days. CREATE TABLE `partitioned` ( `id` bigint(20) unsigned NOT NULL ...
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174 views

Connection problems with ManagePartition executable

I'm currently running SQL Server 2014 and we have some tables that have been partitioned and I'm trying to use the ManagePartition application here (http://sqlpartitionmgmt.codeplex.com/) I've typed ...
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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 ...