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

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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 = ...
3
votes
0answers
98 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 ...
3
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0answers
318 views

PostgreSQL 9.2 - Partitioning: Constraint Exclusion on SELECT not kicking in [closed]

My partitioned table SELECT queries include all partitioned tables even though checks are in place and constraint_exclusion = on. The insert trigger works fine and new rows are inserted into the ...
3
votes
1answer
172 views

MySQL table architecture

Background information: I have a table containing upload information, every day I get more and more uploads but most of the queries I run center around information gathered within the last 12 months; ...
3
votes
2answers
2k views

ALTER TABLE SWITCH statement failed

ALTER TABLE SWITCH statement failed because column does not have the same ANSI trimming semantics in tables... Does anyone knows how to fix that on already existing table full of data? Well, I've ...
3
votes
1answer
265 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 ...
2
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2answers
2k views

Why the query scan all the partitions?

I have the following partitioned table create table T (Month char(6), ID int, .... primary key (ID, Month)) on psMonth(Month) The partition function is CREATE PARTITION FUNCTION [pfMonth](char(6)) ...
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2answers
1k views

Is it possible with SQL Server 2008 to have a Partioned Tables with an Identity Column?

I'm not thinking of using it for the partition function. I just want to know, if it is supported or not. Don't tell me why it is not a good idea to use such columns on partitioned tables.
2
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1answer
710 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 ...
2
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1answer
3k views

When is data moved during an Oracle partition split?

I need to split an Oracle partition, and I'm confused about whether or not Oracle is going to physically relocate the data when I execute the split. Here's what I intend to do: alter table ...
2
votes
2answers
310 views

MySQL Partitioning

I have a MyISAM table that holds a few million Messages. I am thinking about converting it to an partition InnoDB table. Just wondering about the best partition strategy. I would like to do this ...
2
votes
1answer
135 views

Optimise huge Postgres table for fast read

I'm about to create a Postgres table with 1.5 billion rows. The table will just have a single TEXT column. The table is effectively a blacklist. When a user of my software saves certain data, this ...
2
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2answers
119 views

SQL Server 2012 Table Partitioning - Have I done it correctly?

I have a table that stores accounting transactions for what we call "jobs". The table looks like this: ( REGION char(3) JobNumber char(17) SeqNum decimal(5,0) ..... ..... ..... AcctYear decimal(4,0) ...
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votes
2answers
168 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] ...
2
votes
2answers
313 views

Partitioning a multi-terabyte database [closed]

We have a database which is nearly 3TB in size, out of which 8 tables together are 1.5TB which we want to partition based on year. But as we will be partitioning over a terabyte of data, this will be ...
2
votes
1answer
759 views

How to partition a very large table with limited db space?

I have a very big table. I want to partition it, but I cannot. Database size: 1TB, Free space 200GB Table: Size: 165 columns (row lengh 4216 KB, no LOBs), 500 million rows, 600GB of data. ...
2
votes
1answer
177 views

Can not add list partitions

Following is the create table statement that is working as expected. But if I have a table without any partitions and if I try add partitions, it seems that I can not add more than 16 values in it. ...
2
votes
3answers
42 views

SQL Server uses only PRIMARY partition by default

My database has 2 partitions files: PRIMARY, DATABASE_ARCHIVED. A lot of tables have a column "archived". When archived is 1 row is in the DATABASE_ARCHIVED partition. When archived is 0 row is in the ...
2
votes
1answer
98 views

Shrinking old partitions

I have a large partitioned time series table where each partition is stored in it's own file. Since it's time series based partitioning divided by week and I'm only storing data that is new I have ...
2
votes
2answers
520 views

Return ID from partitioned table in postgres?

When I insert a record I need to return the inserted id by RETURNING. The problem is that the table is partitioned and in partitioned table I can't use RETURNING. I run multiple queries at once so I'm ...
2
votes
2answers
565 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 ...
2
votes
1answer
446 views

Does SQL Server have a reference partitioning equivalent?

Oracle 11g has introduced a new feature that is called Reference Partition. Using reference partitioning, a child table can inherit the partitioning characteristics from a parent table. ...
2
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2answers
1k views

Best option to back up mysql innodb partition

We have a number of tables which we plan to partition based on months. The issue now before we can drop those partition we would like to perform backup. One option we found is this link ...
2
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1answer
7k views

After truncating a single partition its Primary key's index becomes unusable and all inserts/updates into that partition fail

I have a partitioned table: SAMPLE_PARTITIONED_TBL with 60 partitions (no sub-paritions) based on the PERIOD_ID numeric field (Data set: 201001...201212.. and so on). This table has several local ...
2
votes
2answers
1k views

Best practices for creating partition schemes and functions

I'm implementing partitioning for the first time in SQL Server 2008 R2. I've several large tables that I am partitioning. My main question is: Should I use the same Partition Scheme and Function for ...
2
votes
2answers
45 views

Benefits of table partitioning on same disk

Maybe is stupid question, but I must ask to be clear with that. I know that table partitioning is powerful mechanism of speeding data search when partitions is placed on different disks. What I need ...
2
votes
1answer
66 views

Why do we need partitions in PostgresSQL? (or any other RDBMS)

So, I am trying to teach myself partitions in PostgreSQL. I understand that a database can become slow when a table hits millions+ of lines and indexes don't fit into memory anymore. One thing that ...
2
votes
1answer
194 views

Script Table Definition in Powershell

I'm writing a powershell to create a duplicate table(in another schema) for the purposes of partition switching*. I'm having problems adding the columns and the clustered column store index. Here's ...
2
votes
2answers
118 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 ...
2
votes
1answer
107 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 ...
2
votes
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 ...
2
votes
2answers
163 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. ...
2
votes
1answer
608 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 ...
2
votes
1answer
852 views

How can I find out which tables use reference partitioning from the Oracle data dictionary?

I'm writing a generic drop-all-objects script for our Oracle databases. It generates drop table TABLE_NAME cascade constraints purge lines for all tables, amongst other object types, by looping ...
2
votes
2answers
486 views

How to do Partition for MySQL 100GB table in zero downtime?

I have a Innodb engine table with 100GB,I have a planned to do partition the table.Can anyone tell me how to do it in zero downtime? In 100GB table the records are increasing for each and every ...
2
votes
1answer
444 views

InnoDB, Hash Table, Reference Table and Fragmentation

I have a big list of domains and URLs that I store in a database, there are around 150M domains and 300M URLs, I'm using InnoDB to store each in the format: CREATE TABLE IF NOT EXISTS `domains_list` ...
2
votes
1answer
5k views

Rename interval partitioning system generated partition names

I have an existing table which I partitioned (interval partitioning on a daily basis) using dbms_redefnition. PARTITION BY RANGE ("TIME_ID") INTERVAL (NUMTODSINTERVAL(1,'DAY')) (PARTITION "p1_1" ...
2
votes
1answer
226 views

Unique Non Clustered Column in Partitioned table

We have partitioned one of our SQL Server tables on a Clustered Index datetime column, we have a Primary key Non-clustered index column with Identity data type and this column is setup as a ...
2
votes
2answers
523 views

Investigating/Troubleshooting I/O Spikes

We have been experiencing some relatively large I/O (IOPS) spikes on the SAN that supports our production SQL Server. The spikes seem to fall at an exact time after the hour, each hour. We have ...
2
votes
3answers
2k views

db2 range partitioning attach and detach issue

We have a table which is used in many select Queries, as it is be accessed by customers to fetch their information. Also they can change their information too whenever they want. We had to retrieve ...
2
votes
1answer
801 views

PostgreSQL partitioning query performance inexplicably bad

I find this a bit mysterious. The cost of getting the maximum value out of just the partition parent table (which is empty) is very cheap: evlampts=# explain select max(timestamp) from only mcdata; ...
2
votes
1answer
121 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 ...
2
votes
1answer
82 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 ...
2
votes
1answer
2k views

Sharding Postgres Database

I have a Postgres database that has grown to the size where it is no longer feasible to store everything on a single database node. There is a Customer table in my schema where each row represents a ...
2
votes
2answers
8k views

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 ...
2
votes
1answer
405 views

Does partitioning a MySQL table also increase index creation performance?

This is something I was wondering since I'm planning to partition a aggregation table with 10 mil records where rebuilding indexes cause table locks for some time. Because partitions are bluntly put ...
2
votes
1answer
932 views

Why is MySQL order by performance poor within a single partition of a partitioned table?

I have to store some sequence numbered data in MySQL. I have about 300,000 data items per day for about a 10 year span. Let's say the table structure is just sequence number (a big int) and data (a ...
2
votes
1answer
176 views

Availability Groups and Partition Swapping

Is it possible to use SQL 2012 Availability Groups over two machines and perform partition swapping on the primary machine ?
2
votes
1answer
263 views

Where are partitions defined in mysql

I have a large table that I want to spread across multiple disks/LUNs. It will contain blobs and I want to have it separated out from the other data. How do I go from new disks (lets call them ...
2
votes
1answer
500 views

Migrating database from SQL Server 2005 Enterprise to SQL Server 2008 Standard

I'm attempting to migrate a database from SQL Server 2005 Enterprise to SQL Server 2008 Standard. I've run into an issue because there is a partition function defined in the database of the Enterprise ...