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

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How to define partition according to Date?

I am currently using MySQL 5.6. In my database, I have a log table called paramlog_ems. It has 2M rows I want like to partition this log table according to Date. Here is the table structure: ...
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276 views

Many columns vs few tables - performance wise

Yes, I am aware that data normalization should be my priority (as it is). I've got a table with 65 columns storing vehicle data with columns: used_vehicle, color, doors, mileage, price and so forth, ...
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611 views

SQL Server Standard edition attach partitioned database

I have a little problem. I'm using a SQL Server database version 11. I have to change database edition from enterprise to standard. I overlooked fact that standard edition doesn't have partitioned ...
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667 views

Will enabling row movements on list-partitioned table cause performance problems(oracle 11g r2)

Our incident management system has run for years, and the large quantity of closed incident tickets makes the table rather huge and slows down the search queries. Our database version is oracle 11g ...
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90 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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105 views

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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22 views

Logically Horizontale-Partitioned Tables

I have two legacy tables, lets call them TableA and TableB. Both of them fall under the same schema design with identical columns, in other words you can union them directly as one table. The only ...
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569 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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805 views

How to partition an Oracle table with 65 million rows?

The table that needs partitioning contains a list of Components and their Values. So one table is tblComponents. Another is tblFields. Then this table, tblValues, contains the values of the ...
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5k views

conversion of high_value to date datatype

I need to comparte the high_value which is of LONG datatype to sysdate which is of DATE datatype. I need to fetch the partition names of all the partitions which is 90 days old. The code is some what ...
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1k views

MySQL, “columns partitioning” when multiple columns are individiually important

MySQL 5.5 introduces "columns partitioning". http://dev.mysql.com/doc/refman/5.5/en/partitioning-columns.html I'm trying to better understand how it works when two columns are important individually. ...
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95 views

Where does it make sense to store Indexes for partitioned tables?

Prior to table partitioning, all the indexes were stored on a separate drive, per this question. Now that I partitioned a couple of tables, SSMS is offering to store indexes in the partition scheme. ...
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1k views

oracle global index vs local index on a partitioned table

I have a table that has range partition by month on a date column (created_time). I was wondering what is more efficient of creating a global index on this column or creating a local index on this ...
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131 views

Reasons against using local indexes

For Oracle 10g and above: except in cases where a local index cannot be used and a global index is needed (e.g. unique constraint), is there any reason to favor a global index over a local index?
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Diffrences between master and slave replication in mysql?

In a database named asterisk, there is a table named cdr which was partitioned on the time field. mysql> show create table cdr; Create Table: CREATE TABLE `cdr` ( `gid` bigint(20) NOT NULL ...
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22 views

How to merge partitions in Postgres?

I have a table that is partitioned by date on a monthly basis beginning January 1, 2014. There is significantly more rows of data in 2015 than there were in 2014 and the data in 2014 is not accessed ...
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39 views

mysql RANGE partitioning - how do I find partition boundaries?

I am implementing partitioning support for mysql in eludia engine I need to compare partitioning description in model with actual database contents and alter table, if necessary. To extract all ...
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77 views

How to migrate data of to another sql server

Good day, I have a database running on a virtual machine hosted at our ISP. It is a fairly large database which has about 5GB of data inserted into it every day (network logs). It is partitioned ...
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152 views

Is there any way to use “like” operator during oracle table partitioning

I am using Oracle 11g database and I have 45 million records. I want to partition the table, but if it's possible for partitioning to support the like operator then it will be much helpful for me. In ...
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36 views

How to efficiently swap a portion of a large table's data?

I run an application (price comparison website) where I need to update a pricing table with dozens of millions of rows every day. Basically, every product feed I download from a merchant results in ...
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94 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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619 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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5k 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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79 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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253 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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163 views

Partition Function with only one value, what does this effect?

I am currently looking at a database that has been setup by the default installation routine of AppFabric. Looking at the creation scripts I encountered this partition function: CREATE PARTITION ...
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101 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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493 views

MS SQL Server 2005 DB backup with partitioned tables to non-partitioned SQL Server 2012

I have a database with several partitioned tables on MS SQL Server 2005 Enterprise, and I have to restore this DB on MS SQL Server 2012 Standard. Since Standard doesn't support partitioning - it's a ...
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212 views

Monitor Oracle query plans for PARTITION LIST (ALL)

Is there any way I can monitor all the queries running on an Oracle instance and report which queries are using PARTITION LIST (ALL)? What I'm essentially asking for is a way to automatically ...
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267 views

Can a partitioned table span on multiple files across different file groups?

In SQL Server 2008 and above, if a table is partitioned, can it span across multiple files across multiple filegroups? Thanks
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134 views

Key lookup partition pruning

I have a query inner joining multiple tables all of which are partitioned and have 10 partitions each: SELECT A.COL1, B.COL2, C.COL3 FROM A INNER JOIN B ON A.ID = B.ID INNER JOIN C ON A.ID = C.ID ...
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160 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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2k views

Indexing issues while partitioning with dbms_redefinition

I get an error while doing the redefinition. Following are the steps which I have taken so far: Step 1. Start redefinition DBMS_REDEFINITION.CAN_REDEF_TABLE(v_name, 'T_FDC_TOOLCONTEXT', ...
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210 views

Is there a way to write intelligent queries against a merge table in MySQL that represents a bunch of tables partitioned by date?

I have a set of MySQL tables that are partitioned by date, with a merge table representing all of them. For the query I am writing, the results are joined by date, so rows in table A_2012-12-05 will ...
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3k views

PostgreSQL 9.1 - Query on VIEWS taking a lot of time

Using PostgreSQL 9.1, we are having problems while executing queries on a VIEW of PostgreSQL. Following is the situation: We have a partitioned Table "buz_scdr" over which we have built a VIEW ...
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409 views

What is the “Data partitioned, Shared-Nothing, Parallel Database” solution for PostgreSQL ? [closed]

I was looking for a open source parallel database solution. It seems Postgres-XC is a viable solution. However, I don't need the replication. In this case, is there any better solution towards read ...
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646 views

How many files should I create for one filegroup and 9 weekly partitions?

I have 9 weekly partitions on one filegroup. How many files do I need to create? There are 3 tables containing 46 million, 16 million and 10 million rows.
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611 views

Create multiple files for each file group for table partitioning?

I am partitioning a table by date (month). The server has four drives. The partition scheme is defined as CREATE PARTITION SCHEME ByDate AS PARTITION ByDate TO ( [PRIMARY], [fg2], [fg3], [fg4], ...
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Explain partitions

What does the possible keys, reference and rows indicate in explain partitions? I have used partitions on the table and I executing the explain partitions with a query: select ...
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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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253 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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69 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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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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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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57 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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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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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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102 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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192 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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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 ...