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

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15 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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1answer
445 views

Are there any disadvantages to partitioning on financial year?

Our current set up has one table per financial year (May 1- April 30). Each table has approx 1.5 million rows. We have about 8 years of data, and will obviously be adding each year. The majority of ...
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1answer
86 views

SQL Server data files in Windows Azure: filegroups and partitioning still applicable?

I just created a database using the new functionality "SQL Server 2014 data files on Windows Azure" and this works quite well. However, I have a table with a billion records and in our local ...
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12 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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1answer
942 views

Partition by year and sub-partition by month mysql

I have a database with a date column having datatype as date. I am using mysql 5.6 The table is expected to have 10k rows each day. I want to create partition on the table on year range and then sub ...
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1answer
23 views

Oracle 11g r2: Cannot create partition on timestamp field

I have data with a timestamp field of the form '2014-01-01 00:00:00.99' in one of the columns. I want to create a new partition for the table every month. For this I did something like this. CREATE ...
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2answers
3k views

Oracle: adding subpartitions to existing partitioned table

In Oracle 11g, is there a way to introduce subpartitions into an existing partitioned table? I cannot seem to find a combination of EXCHANGE and SPLIT partition that does the right thing. SPLIT will ...
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1answer
109 views

Add partition works but not the drop partition

We have set an event as below. What we notice is that the add partition is working well as we can see on a daily basis the partition list is growing but the drop partition is not working well any ...
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22 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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1answer
144 views

Is searching an alternate index on a partitioned myISAM table concurrent or serial?

I have a myISAM table with 30 partitions. The primary key is a SHA1 hash value, which is also used in the partition selection function. I also have an alternate key - an autoincrement integer. Since ...
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1answer
35 views

Getting rid of partitioning in Postgresql 9

it turns out that our approach with list partitioning was not the best idea. We have way to much small partitions and a lot of time is wasted on partition choosing by query optimizer. What's the ...
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1answer
41 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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2answers
100 views

Make sure partitioning is working

I created a partition for a table. There is a column "archived" (tinyint). 0 goes to PRIMARY data file, 1 to ARCHIVED data file. ALTER DATABASE MYDB ADD FILEGROUP [ARCHIVED]; ALTER DATABASE MYDB ADD ...
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2answers
103 views

Slow querys on billions-rows-table // index used

Since I'm a young developer and not realy skiled in using databases (PostgreSQL 9.3) i ran into some problems with a project, where i realy need help with. My project is about collecting data of ...
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1answer
238 views

Snapshotting Database Tables

I have a reporting database (in SQL Server) that takes nightly snapshots of the production data (Oracle) for users to query against for the next day, but now the requirement is getting to be that they ...
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1answer
92 views

Best way set clustered primary key on a partitioned table?

I have the following table. create table T (K1 date, K2 int, K3 varchar(10), C1 int, C2....) The table will be partitioned by K1 (K1 has low selective. the data will be appended in the order by ...
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2answers
97 views

Update on view over partitioned tables updating all indexes

We have a table, which is partitioned through a date field into separate years. There is a view over all of these tables (Call) Schema is as follows: CREATE TABLE [dbo].[Call_2015]( [calID] ...
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25 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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1answer
135 views

Partition : understanding files and file groups

We are trying to partition a large history table. Being new to partitioning, I was trying to understand the concept of files and file groups. File groups can be set up in following three ways : 1. ...
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37 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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1answer
52 views

Adding Indexes To a Partitioned table in SQL Server 2012

I have recently converted our one large table to use table partitioning in SQL Server 2012. It's a table that stores logs based on a time. So I created a partition function to split the table on my ...
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1answer
52 views

Switching Data In Fails with “allows values that are not allowed by check constraints or partition function on target table”

Given the following -- table ddl create table dbo.f_word( sentence_id int NULL, sentence_word_id int NULL, word_id int NULL, lemma_id int NULL, source_id int NULL, ...
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184 views

Renaming the system generated partitions during interval partitioning

I am trying to rename the system-generated partition names (generated during interval partitioning). I try to do this while my table is live(data read and write is happening). I need two scripts. I ...
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1answer
43 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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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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1answer
38 views

How does subpartitioning actually work and what physical files are created?

I can't understand how the subpartitioning works in mysql. I am reading the following example: create table invoices ( customer_id int not null, product_id int not null, amount decimal ...
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1answer
489 views

Join tables in two databases make query slow? is better to partition db?

I have a table1 in db1 and table2 in db2 on SQL Server 2008 R2. If I make a select query joining both tables, it's really slow to get the results. A simple query like SELECT * FROM db1.dbo.table1 ...
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2answers
32 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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2answers
99 views

Dynamic Table partitioning on a daily basis

I have a SQL Server database which contains two tables -- Acks and Logs. These two tables are related in logic but not in a relational database way. Basically, every message that comes in gets saved ...
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2answers
1k views

Get all partition names for a table

I want to list all the partitions created by dynamic triggers in PostgreSQL 9.1. I was able to generate a count of partitions using this related answer by Frank Heikens. I have a table foo with an ...
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3answers
47 views

Redesign basic Mysql storage architecture

We are a small Internet provider and we are storing all our clients traffic data in a MySQL database (MyISAM). We insert data every few minutes in three tables like this: capture_table ---------- ...
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1answer
120 views

Archive partition before delete it?

I have manage to create an event and with the following scripts could both create and delete the partition. The issue now I need help on how to save the partition before its deleted? Should I use ...
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38 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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2answers
1k 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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33 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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2answers
78 views

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, ...
2
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1answer
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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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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48 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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37 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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2answers
65 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 ...
2
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1answer
40 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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1answer
42 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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59 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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4answers
171 views

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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17 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
394 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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3answers
4k views

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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1answer
185 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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1answer
459 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 ...