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

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SQL Server 2008 R2 Partitioning - same FileGroup, 1 File, 2 partition_numbers - HELP

It's my first go at partitioning in SQL Server, I learned from the Brent Ozar guide which is fantastic :) A few times I have ran into a weird scenario; when I run: SELECT * FROM ph.FileGroupDetail ...
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80 views

Why is my SQL Server query behaving differently on UPDATE than on SELECT?

I've written a SQL Server query that updates records to have a sequential number after partitioning on a field. When I run it as a SELECT statement, everything looks great: DECLARE @RunDetailID INT = ...
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92 views

Get inserted row count when master table isn't modified

I have a partitioned table where data resides only in the child tables. The master table has an insert trigger that will distribute inserted data into appropriate child tables. Now, I need to create ...
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184 views

Postgres - Partitioning old tables, partition query planning, optimisation

I've been trying to optimise our database, but not being a DBA and not having done a whole lot of tuning before I'm struggling a little with "too many options". I've already run pg_tune and bumped a ...
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95 views

MySQL Partitioning Performance

I have a MyISAM table with billions of rows that is still causing me problems because the indexes, even after I shortened them as much as possible, do not fit in my 64GB of RAM. I am unable to index ...
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364 views

Dynamic MySQL partitioning based on UnixTime

My DB design includes multiple MYISAM tables with measurements collected online, Each row record contains auto-incremented id, some data and an integer representing unixtime. I am designing an aging ...
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79 views

MySQL Partioning: Is there a performance tradeoff between number of partitions and size of each partition?

I have a large table (several 100 million rows) that I would like to efficiently partition. My question is whether there is a tradeoff between partition size and number of partitions. As far as I ...
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112 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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81 views

Fast restore of dropped partitions

I want to test the restore of errorneously dropped partitions of a subpartitioned tables. This restore would consist of three steps: restore the database (or at least the necessary tablepsaces) to ...
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30 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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57 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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77 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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216 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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51 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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615 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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24 views

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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241 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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102 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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237 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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175 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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63 views

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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14 views

Working on a blog creation website; should I be creating a new table for each blog, or keep everything on the same table?

So I'm working on this blog creation website as a side project. I don't actually expect it to become anything, but I want to make it as efficient as possible, even if just for practice. The idea is ...
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8 views

Delete datafile from parttioned table

I'm used SQL Server 2014. My big table partitioned by date column and each partition has own datafile. I want delete oldest partition data and data file too. How to do it?
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25 views

Is there a workaround for the lack of foreign keys constraint to a partitioned table in PostgreSQL?

I have a big table A (~30 million lines) at the core of my model. Another table B has a foreign key referencing A. I would like to partition A using the well-known inheritance hack. Is there a ...
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12 views

Moving Replicated & Partitioned SQL2005 Enterprise to SQL 2008R2 Enterprise

Our SQL2005 Enterprise has 4 databases which are all partitioned, each have 5 files and a handful of tables replicated, compatibility mode is 90. They are on an old Windows Server 2003 32bit machine ...
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18 views

PostgreSQL analyze only parent table only

I am moving data from a few billion records table to newly created partitions. I am inserting into the child table directly and deleting from the main table with filters on the appropriate columns in ...
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41 views

Partitioning large table requires lots of extra disk space: does switching recovery model help?

We are in the process of implementing partitioning on a SQL Server 2012 database. It worked fine in our environment, but in the client environment we ran out of disk space. The entire database was ...
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36 views

Import non-partitioned table into an existing range partitioned table - ORACLE

I have export non-partitioned table1 on disk with some records, then I create same new table2 in my schema (different name) but with range partitioning, I'm talking about Oracle database. So my ...
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48 views

SQL Server Partitioning - parent/child tables reference partitioning

I have a requirement to partition quick growing tables in our product and below are the table information with key details. PERIODIC_EVENTS (PARENT TABLE which has ID (sequence no) as Primary KEY and ...
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28 views

How to determine is a value exists in a column within a partition

I have a set of data where I need to look at partitioned data and determine if a value exists within that partition. Example data: AccountNumber Code Status Credited ...
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27 views

Creating separate small table from big based on access frequency for “select” performance

I have table with several millions of rows which are selected a lot (many times in a second in average). It is indexed and everything is ok for now. But performance is always a question (sometimes ...
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147 views

How to partition a MySQL table by Week using a timestamp column?

I have the following MySQL 5.6 table, which uses InnoDB and contains a timestamp column (I've omitted all the extra columns, in order to simplify my question): create table partition_by_week ( id ...
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52 views

High CPU Usage for Mysql after adding partitions

On an amazon m3.large instance (vCPU:2, Mem: 7.5), I run a mysql(5.5.29) server. Initially, the state of the server is OK except that the query is too slow. However, after partitioning the table ...
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31 views

Is database sharding done on a table level or database level?

I'm new to sharding databases, so I'm trying to wrap my head around it. Let's say we have a database that has 3 tables: Customer, Suppliers and Orders. Each table has 10 million records. I want to ...
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17 views

Support for dynamically creating partitions

I would like to know the following: Is there a RDBMS which offers support for creating partitions for a table dynamically? For e.g.: If I choose to partition a table by day/week etc., I want it to ...
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113 views

Using partitioned table, and dealing with auto_increment PK

I have a big table (>100 million rows) that tracks user's activities. It has an ID, which is PK and has auto_increment property. This is the only unique key. Table also has userid and datetime column. ...
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59 views

Recreate partition in mysql

I have a table having datetime column partitioned by RANGE (DAYOFYEAR(datetime_col)) By this I want to drop oldest of 4th week partition data and recreate immediately for next year similar week ...
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47 views

Oracle estimate cardinality on partitioned table

How does Oracle estimate cardinality on a partitioned table if the query gets the list of partitions from a subquery or a join? For example, if I have a query like this select * from ...
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46 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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119 views

Performance degradation after partioning tables using DBMS_REDEFINITION package

We have created partitions on per-existing tables in my application using DBMS_REDEFINITION package. just for the sake of improving performance. Now , We are facing an issue in the performance ...
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22 views

How to figure out how to split a table using the proper scheme

If you have a big table that you want to partition and you have 2 candidates as the partitioning key (in the sense that 50% of the queries use one column and 50% of the queries use the other column ...
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41 views

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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78 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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62 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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173 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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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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58 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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105 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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79 views

MySQL: Optimizing for large but discrete data sets

In brief: I'm developing a database that handles GTFS datasets from multiple transit agencies. Each dataset contains millions of rows in the stop_times.txt file (and thus its corresponding table). ...
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93 views

How do I debug an Oracle Linux Diskspace Issue?

I have about 429GB Diskspace allocated to this VM. I see that only 179GB is being used. Now when I try to add a 128GB file I get an I/O error saying I do not have any space left. I need to be able ...