A database structure that can improve the speed of queries at the cost of disk space and slower inserts/updates. It stores a copy of one or more columns but structures the data differently to allow for faster access.

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23 views

N-dimensional vectors in PostgreSQL Spatial Index

I have many 8-dimensional vectors. And I want to construct on them a R-tree ('USING gist' in PostgreSQL). But I have got stucked at the choice of the correct geometrical type. Whether the 'path' type ...
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0answers
30 views

Detect when a CREATE INDEX CONCURRENTLY is finished in PostgreSQL

If I create an index CONCURRENTLY in PostgreSQL, how can I see when it is finished? I am attempting to rebuild indexes to solve index bloat, and I need to keep the old index around for a while until ...
2
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1answer
68 views

Index columns with arithmetic operators

I commonly make this query on my database SELECT * FROM Example_tab WHERE Column_a + Column_b < 10;. Is it possible to create indexes based on Column_a + Column_b < 10 to speed up this lookup. ...
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1answer
29 views

InnoDB slow query (few derived and dependent queries)

I have a select query which always worked pretty fast but data kept increasing which is why this query became very slow (2/3mins). I need to get all 0 values from those tables in the last WHERE ...
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2answers
37 views

What is the minimum privilege required to create a full text index?

I just created a full text catalog on my database. I now have a developer who needs the ability to create full text indexes on the tables in this database. The suggestion given in a previous ...
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1answer
30 views

Query not using indexes

I have a query which is not using the timestamp index and scanning 200 million records. I know that the query will not use the index if there is a function applied on top of it. However is there any ...
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3answers
76 views

Is having Estimated number of Rows > Actual Number of Rows an issue to worry about?

I've a table [order] where a simple select shows cardinal difference between Estimated Number of Rows and Actual Number of Rows and in a strange way. Generally Estimated Number of Rows skews as ...
2
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2answers
79 views

How do I get the DDL used to create function based index?

I am reverse-engineering the schema of an Oracle database. I have a table and I created a function-based index on it. DROP TABLE Fbi_tab; CREATE TABLE Fbi_tab ( a INTEGER, b INTEGER, c ...
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2answers
53 views

What is the ideal composite index for this query?

What is the ideal Composite Index in MySQL for the following query on an InnoDB Table1? SELECT ColA FROM Table1 WHERE ColB = 0 AND ColC = 0 AND ColD = 0 ColA is the left-most Primary Key. ColB ...
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1answer
38 views

PostgreSQL not using partial index when using boolean in WHERE clause

I'm trying to create a partial index which includes rows based on a boolean value but in my tests neither rows with the value set to TRUE or FALSE are included in the index, or at least the index ...
2
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1answer
50 views

How to start indexing a new data warehouse

I am building a data warehouse (SQL Server 2012, Kimball Dimensional modeling, 750GB) that will supply data to reports (SSRS), cubes (SSAS) and various datafeeds. I plan to use an index tuning tool ...
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1answer
304 views

Execution plan with multiple missing indexes

If you run a query with 'Include Actual execution plan' the plan will also suggest indexes which are missing. The index details are inside MissingIndexes tag in the XML. Is there a situation when the ...
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1answer
56 views

Preventing MySQL index corruption

I'm having a recurring issue with a MySQL database where one index in particular has been getting corrupted. Originally I saw a corruption event about every 2-3 weeks and this week I've seen it happen ...
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1answer
63 views

Index fragmentation increased significantly after rebuild

I've googled this and I know that some people say index fragmentation doesn't matter, but they go on to describe scenarios where it might matter. Mine might be such a scenario. I have an index on a ...
3
votes
1answer
114 views

Speeding up a GROUP BY, HAVING COUNT query

I'm trying to speed up this query in Postgres 9.4: SELECT "groupingsFrameHash", COUNT(*) AS nb FROM "public"."zrac_c1e350bb-a7fc-4f6b-9f49-92dfd1873876" GROUP BY "groupingsFrameHash" HAVING COUNT(*) ...
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0answers
33 views

Weird single-column “key” index in mysql

I am running MySQL 5.5.47-0+deb7u1-log (Debian). In a database I have two tables with exactly the same structure, roughly the same data (don't ask me why, its a long story..., and I know they are ...
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1answer
59 views

Postgresql 9.5 BRIN index dramatically slower than expected

I have a table with over 12 million rows of log data and have migrated to Postgres 9.5 to take advantage of the new BRIN index because I have disk space limitations. I assumed that my situation was ...
0
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1answer
38 views

Query bytea column using prefix

Assuming I have a table with a bytea column called data on a table called t, how can I: Write a query that returns all rows which have a specific prefix on their data column. Index the query. I am ...
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1answer
61 views

If I query records matching some value, why does InnoDB examine most of the records that had that value once, but have changed since then?

We have an issue with MySQL InnoDB performance. We insert records into a table with a status field value of zero, these records need to be processed by another task. When this another task starts ...
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1answer
103 views

Index SEEK is not used unless OPTION (RECOMPILE)?

(Question moved from SO) I have a table (dummy data) with clustered index contains 2 columns : Now I run those two queries : declare @productid int =1 , @priceid int = 1 SELECT ...
1
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1answer
23 views

Postgres odd behavior with indices

I've got a datavalue table with ~200M rows or so, with indices on both site_id and paramter_id. I need to execute queries like "return all sites with data" and "return all parameters with data". The ...
2
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2answers
173 views

Clustered Index Creation

I have been trying to create a clustered index on a table which is 1.4 TB in size. This is my query: CREATE CLUSTERED INDEX [C_IDX_Impressions] ON [dbo].[Impressions] ( [User_ID] ASC ) WITH ...
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2answers
65 views

PostgreSQL ignoring (unique) index on TEXT field

I have a users table similar to CREATE TABLE users ( id bigserial NOT NULL, msisdn text NOT NULL ); and a UNIQUE constraint defined on msisdn: ALTER TABLE users ADD CONSTRAINT UNIQUE (msisdn); ...
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1answer
30 views

MySQL indexing issue when trying to search for a part of a string/word

What we're running into: Engine: MySQL. We've been working on a filter where an user can search for a reference number. However, we've ran into an issue with performance on bigger data sets. We ...
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1answer
64 views

Choosing good indexes for my queries

I have a table which looks like this: Messages table: Message_ID (BIGINT) PK auto_increment FromUser (INT 16) ToUser (INT 16) DateCreated (Timestamp) MessageText (Varchar (500) ) HasRead (TINYINT ...
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3answers
271 views

Field order in a composite index order with high selectivity and low selectivity fields

I have a SQL Server table with over 3 billion rows. One of my query takes an extremely long time so I am considering optimizing it. The query looks like this: SELECT [Enroll_Date] ,Count(*) AS ...
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2answers
62 views

Performance for MySQL InnoDB B+Tree index with many duplicate values

I'm trying to diagnose seemingly random performance issues with our database server. Below is a simplified scenario, hopefully generic enough to serve as a useful future reference for anyone looking ...
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1answer
111 views

How can I improve this table, and subsequently the performance of the queries I execute on it?

I have inherited this table of POS transaction level data. In my opinion it is terrible. There are 3.5 million rows, which span ~4 years, with a distribution of anywhere between 1 result and 100k ...
5
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2answers
156 views

Total billions of rows and daily millions of row insert: What database system suits best [closed]

We developed a system with very high volume of data but very simplified data structure. We had only cellX, cellY, timeStamp and value columns. Operations are: Insert 455+ thousand rows per day ...
3
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1answer
79 views

Using ILIKE with unaccent and with only right end wildcard

I use Postgresql 9.4 and I have a big table named foo. I want to search on it but I get long execution times if the search text is very short (e.g. "v") or long (e.g. "This is a search example with ...
6
votes
1answer
103 views

Index Allocation Maps

I am a developer reading the book "Querying Microsoft SQL Server 2012." I have come across the following diagram: Why are the pages in the first two rows of the diagram (row 1 starting: 1:174 and ...
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0answers
52 views

Cardinality of an index in a MySQL table is equal to table's row size

I have just included an index to a MyISAM table and the cardinality appears to be 1 million something which is exactly the number of rows in the table. In fact it needed to be 315 because distinct ...
2
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1answer
39 views

How do I recover my database after losing a tablespace with indexes?

I'm thinking of moving all the indexes in my PostgreSQL 9.3 database to a tablespace on an SSD for improved performance. This SSD is not in a RAID array and I need to consider a scenario where it ...
2
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2answers
306 views

SQL Server : Included columns in an Index: is there something like “too many”?

We have a table in one of our databases with approximately following structure: Field1 int primary key Field2 int foreign key A Field3 int foreign key B Field4 int foreign key C Field5 ... Field70 ...
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1answer
30 views

Splitting the table to get more clusterization options - will it help? [closed]

Complete theory. Let's assume we have a table with a few millions rows. The table has clustered index over PK, and it is important for quick fetching of particular rows. However, the table also has a ...
3
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0answers
84 views

Sort operation SQL Server 2012

I am trying to optimize a query and the sort operation (91% cost) is the costliest operation. Any help will be appreciated. Query is : SELECT TOP 1 ArchiveType, CONVERT(NVARCHAR(30), ...
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1answer
49 views

Full text indexes on big tables

I have a news website where I store my articles in a table that looks like that: Id title data Where data contains the content of the article and is the biggest column in the database by far. ...
0
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1answer
27 views

How to create unique index for both cases

I have table in PostgreSQL with sender_id and receiver_id and a unique index: add_index :my_table, [:sender_id, :recipient_id], unique: true Table will created, if sender_id: 1, and recipient_id: ...
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6answers
916 views

Fast reads without paying the price on writes

We have a large append-only table containing financial transactions. On average 1000 transactions are inserted per minute. Since there are now more and more usecases where we actually want to read, ...
3
votes
1answer
48 views

What indexing to be used over string columns(text type) with string length around 3000 characters

I am using open source columnar dbms (postgresql+Cstore). I am trying to speed up the response time of queries. My database has tables with strings mostly. String columns contain huge data (up to ...
3
votes
1answer
50 views

Fill Factor: Will the fill factor change automatically after it detects the changes in the index pages?

So lets say that the default fill factor is left at 0 initially. Data has been loaded up into the server and one fine weekend, the index rebuild job is run. Now if it detects any new data which must ...
2
votes
1answer
64 views

Can I use an index to optimize select clause, versus where clause?

I'm not sure if this question has been answered, because I'm not sure of the proper wording to describe what I need. So here it is: I am trying to optimize a database that is running very slowly, ...
2
votes
2answers
50 views

Is there any point with a combined index on all columns in a table?

I have stumbled upon several cases of indices set on all columns of a table. In my mind this will be as efficient as the full table scan that would occur without the index. Is this correct or is there ...
2
votes
1answer
106 views

How to estimate reindexing time?

How do you estimate the total time reindexing an entire table will take in PostgreSQL? I have a large PostgreSQL database, the primary table of which has 15 million rows with 100 columns and 200 ...
0
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0answers
8 views

How to estimate PostgreSQL reindexing time? [duplicate]

How do you estimate the total time reindexing an entire table will take in PostgreSQL? I have a large PostgreSQL database, the primary table of which has 15 million records and 100 columns, and 200 ...
9
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2answers
425 views

Unused Indexes Best Practices

Based on this query, if I see a low amount of total reads (very close to 0 or 0, like 1 or 2) and a high or moderate amount of user updates (I couldn't find inserts or deletes with this query) with a ...
0
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1answer
64 views

Oracle over-indexed tables

I am trying to improve performance of a view in Oracle 11g, the view joins 11 tables, the 3 biggest tables in the query are 40, 27, 19 milions of rows. I found that each of these big tables has more ...
2
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1answer
51 views

How to create an index to be picked by query

I have created multiple indexes one after another, but my query doesn't want to pick them :( CREATE INDEX x ON gan.paid (project_id, country_iso_code, source, date(created_at)); CREATE INDEX x ...
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0answers
42 views

Is there an equivalent of virtual columns in mysql?

Currently I'm taking a look at amazon's new aurora database and I'd like to check how my current setup performs there. The original table is on maria DB and contains a virtual column ...
9
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1answer
136 views

Why can my index seek estimate the right number of rows and the sort operator can't?

I've a query that uses a function on the predicate, something like this: commentType = 'EL' AND commentDateTime >= DATEADD(month,datediff(month,0,getdate()) - 13,0) I have a filtered index on ...