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  • PostGreSQL load increasing over time, why?

    - by TravisO
    It's a CentOS server (I don't know the specs) and just before anybody states the obvious, keep in mind these mitigating factors: the server does a nightly VACUUM job all the tables are indexed it's pretty much read only (meaning the DBs are not increasing in size) the number of queries being ran has been the same every month Here's a graph of the server load:

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  • What method should be used for searching this mysql dataset?

    - by GeoffreyF67
    I've got a mysql dataset that contains 86 million rows. I need to have a relatively fast search through this data. The data I'll be searching through is all strings. I also need to do partial matches. Now, if I have 'foobar' and search for '%oob%' I know it'll be really slow - it has to look at every row to see if there is a match. What methods can be used to speed queries like this up? G-Man

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  • Optimising speeds in HDF5 using Pytables

    - by Sree Aurovindh
    The problem is with respect to the writing speed of the computer (10 * 32 bit machine) and the postgresql query performance.I will explain the scenario in detail. I have data about 80 Gb (along with approprite database indexes in place). I am trying to read it from Postgresql database and writing it into HDF5 using Pytables.I have 1 table and 5 variable arrays in one hdf5 file.The implementation of Hdf5 is not multithreaded or enabled for symmetric multi processing.I have rented about 10 computers for a day and trying to write them inorder to speed up my data handling. As for as the postgresql table is concerned the overall record size is 140 million and I have 5 primary- foreign key referring tables.I am not using joins as it is not scalable So for a single lookup i do 6 lookup without joins and write them into hdf5 format. For each lookup i do 6 inserts into each of the table and its corresponding arrays. The queries are really simple select * from x.train where tr_id=1 (primary key & indexed) select q_t from x.qt where q_id=2 (non-primary key but indexed) (similarly five queries) Each computer writes two hdf5 files and hence the total count comes around 20 files. Some Calculations and statistics: Total number of records : 14,37,00,000 Total number of records per file : 143700000/20 =71,85,000 The total number of records in each file : 71,85,000 * 5 = 3,59,25,000 Current Postgresql database config : My current Machine : 8GB RAM with i7 2nd generation Processor. I made changes to the following to postgresql configuration file : shared_buffers : 2 GB effective_cache_size : 4 GB Note on current performance: I have run it for about ten hours and the performance is as follows: The total number of records written for each file is about 6,21,000 * 5 = 31,05,000 The bottle neck is that i can only rent it for 10 hours per day (overnight) and if it processes in this speed it will take about 11 days which is too high for my experiments. Please suggest me on how to improve. Questions: 1. Should i use Symmetric multi processing on those desktops(it has 2 cores with about 2 GB of RAM).In that case what is suggested or prefereable? 2. If i change my postgresql configuration file and increase the RAM will it enhance my process. 3. Should i use multi threading.. In that case any links or pointers would be of great help Thanks Sree aurovindh V

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  • Stored procedure to remove FK of a given table

    - by Nicole
    I need to create a stored procedure that: Accepts a table name as a parameter Find its dependencies (FKs) Removes them Truncate the table I created the following so far based on http://www.mssqltips.com/sqlservertip/1376/disable-enable-drop-and-recreate-sql-server-foreign-keys/ . My problem is that the following script successfully does 1 and 2 and generates queries to alter tables but does not actually execute them. In another word how can execute the resulting "Alter Table ..." queries to actually remove FKs? CREATE PROCEDURE DropDependencies(@TableName VARCHAR(50)) AS BEGIN SELECT 'ALTER TABLE ' + OBJECT_SCHEMA_NAME(parent_object_id) + '.[' + OBJECT_NAME(parent_object_id) + '] DROP CONSTRAINT ' + name FROM sys.foreign_keys WHERE referenced_object_id=object_id(@TableName) END EXEC DropDependencies 'TableName' Any idea is appreciated! Update: I added the cursor to the SP but I still get and error: "Msg 203, Level 16, State 2, Procedure DropRestoreDependencies, Line 75 The name 'ALTER TABLE [dbo].[ChildTable] DROP CONSTRAINT [FK__ChileTable__ParentTable__745C7C5D]' is not a valid identifier." Here is the updated SP: CREATE PROCEDURE DropRestoreDependencies(@schemaName sysname, @tableName sysname) AS BEGIN SET NOCOUNT ON DECLARE @operation VARCHAR(10) SET @operation = 'DROP' --ENABLE, DISABLE, DROP DECLARE @cmd NVARCHAR(1000) DECLARE @FK_NAME sysname, @FK_OBJECTID INT, @FK_DISABLED INT, @FK_NOT_FOR_REPLICATION INT, @DELETE_RULE smallint, @UPDATE_RULE smallint, @FKTABLE_NAME sysname, @FKTABLE_OWNER sysname, @PKTABLE_NAME sysname, @PKTABLE_OWNER sysname, @FKCOLUMN_NAME sysname, @PKCOLUMN_NAME sysname, @CONSTRAINT_COLID INT DECLARE cursor_fkeys CURSOR FOR SELECT Fk.name, Fk.OBJECT_ID, Fk.is_disabled, Fk.is_not_for_replication, Fk.delete_referential_action, Fk.update_referential_action, OBJECT_NAME(Fk.parent_object_id) AS Fk_table_name, schema_name(Fk.schema_id) AS Fk_table_schema, TbR.name AS Pk_table_name, schema_name(TbR.schema_id) Pk_table_schema FROM sys.foreign_keys Fk LEFT OUTER JOIN sys.tables TbR ON TbR.OBJECT_ID = Fk.referenced_object_id --inner join WHERE TbR.name = @tableName AND schema_name(TbR.schema_id) = @schemaName OPEN cursor_fkeys FETCH NEXT FROM cursor_fkeys INTO @FK_NAME,@FK_OBJECTID, @FK_DISABLED, @FK_NOT_FOR_REPLICATION, @DELETE_RULE, @UPDATE_RULE, @FKTABLE_NAME, @FKTABLE_OWNER, @PKTABLE_NAME, @PKTABLE_OWNER WHILE @@FETCH_STATUS = 0 BEGIN -- create statement for dropping FK and also for recreating FK IF @operation = 'DROP' BEGIN -- drop statement SET @cmd = 'ALTER TABLE [' + @FKTABLE_OWNER + '].[' + @FKTABLE_NAME + '] DROP CONSTRAINT [' + @FK_NAME + ']' EXEC @cmd -- create process DECLARE @FKCOLUMNS VARCHAR(1000), @PKCOLUMNS VARCHAR(1000), @COUNTER INT -- create cursor to get FK columns DECLARE cursor_fkeyCols CURSOR FOR SELECT COL_NAME(Fk.parent_object_id, Fk_Cl.parent_column_id) AS Fk_col_name, COL_NAME(Fk.referenced_object_id, Fk_Cl.referenced_column_id) AS Pk_col_name FROM sys.foreign_keys Fk LEFT OUTER JOIN sys.tables TbR ON TbR.OBJECT_ID = Fk.referenced_object_id INNER JOIN sys.foreign_key_columns Fk_Cl ON Fk_Cl.constraint_object_id = Fk.OBJECT_ID WHERE TbR.name = @tableName AND schema_name(TbR.schema_id) = @schemaName AND Fk_Cl.constraint_object_id = @FK_OBJECTID -- added 6/12/2008 ORDER BY Fk_Cl.constraint_column_id OPEN cursor_fkeyCols FETCH NEXT FROM cursor_fkeyCols INTO @FKCOLUMN_NAME,@PKCOLUMN_NAME SET @COUNTER = 1 SET @FKCOLUMNS = '' SET @PKCOLUMNS = '' WHILE @@FETCH_STATUS = 0 BEGIN IF @COUNTER > 1 BEGIN SET @FKCOLUMNS = @FKCOLUMNS + ',' SET @PKCOLUMNS = @PKCOLUMNS + ',' END SET @FKCOLUMNS = @FKCOLUMNS + '[' + @FKCOLUMN_NAME + ']' SET @PKCOLUMNS = @PKCOLUMNS + '[' + @PKCOLUMN_NAME + ']' SET @COUNTER = @COUNTER + 1 FETCH NEXT FROM cursor_fkeyCols INTO @FKCOLUMN_NAME,@PKCOLUMN_NAME END CLOSE cursor_fkeyCols DEALLOCATE cursor_fkeyCols END FETCH NEXT FROM cursor_fkeys INTO @FK_NAME,@FK_OBJECTID, @FK_DISABLED, @FK_NOT_FOR_REPLICATION, @DELETE_RULE, @UPDATE_RULE, @FKTABLE_NAME, @FKTABLE_OWNER, @PKTABLE_NAME, @PKTABLE_OWNER END CLOSE cursor_fkeys DEALLOCATE cursor_fkeys END For running use: EXEC DropRestoreDependencies dbo, ParentTable

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  • Selecting a column that is also a keyword in MySQL

    - by randall123
    For some reason, the developers at a new company I'm working for decided to name their columns "ignore" and "exists". Now when I run MySQL queries with those words in the where clause, I get a syntax error; however, I can't seem to figure out how to reference those columns without running into an error. I tried setting them as strings, but that doesn't make any sense. Help? Also, is there a term for this kind of mismatch?

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  • TSQL: Global Script Variable?

    - by Abs
    Hello all, I am making use of variables in my TSQL queries. As my script has grown, I have separated each part by GO, now the problem is I need access to variables at the top of my script. How can I still access these variables? Hopefully, this is something simple and straightforward. Thanks all

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  • Make CMD sensitive to use with MySQL?

    - by acidzombie24
    I have a cleanup scrip in a bat file and i wanted to do the below but the problem is i get a mysql error saying unknown database and showing it as testdb. I guess i can change my code testdb but i would like to know. How do i have windows cmd use case sensitivity so i can execute queries properly instead of always in lower case? mysql.exe -u root -q "drop database TestDB; create database TestDB;"

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  • multi word query in mysql

    - by salmane
    Hi there , in order to make things easier for users i want to add multiple keyword search to my site. so that in the input the user would do something like : " keyword1 keyword 2" ( similar to google for example. would i need to write a code that would parse that string and do queries based on that or is there something built in mysql that could do it?

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  • Can you help me optimize this code for finding factors of a number? I'm brushing up on my math progr

    - by Sergio Tapia
    I've never really bothered with math programming, but today I've decided to give it a shot. Here's my code and it's working as intended: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation; using System.Windows.Shapes; namespace PrimeFactorization { /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); } private void btnSubmit_Click(object sender, RoutedEventArgs e) { List<int> primeFactors = FindPrimeFactors(Convert.ToInt32(txtNumber.Text)); primeFactors.Sort(); for (int i = 0; i < primeFactors.Count; i++) { listBoxFoundNumbers.Items.Add(primeFactors[i]); } } private List<int> FindPrimeFactors(int number) { List<int> factors = new List<int>(); factors.Add(1); factors.Add(number); for (int i = 2; i < number; i++) { if (number % i == 0) { int holder = number / i; //If the number is in the list, don't add it again. if (!factors.Contains(i)) { factors.Add(i); } //If the number is in the list, don't add it again. if (!factors.Contains(holder)) { factors.Add(holder); } } } return factors; } } } The only problem I can see with my code is that it will iterate through to the bitter end, even though there will definitely not be any factors. For example, imagine I wrote in 35. My loop will go up to 35 and check 24,25,26,27...etc. Not very good. What do you recommend?

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  • Android Source Not Compilable?

    - by GuyNoir
    So I've been looking at code from various parts of the Android git, but when I try to load and compile many of them (camera, media player, etc) they reference classes and parts of the SDK that just aren't available even with my SDK version updated to 2.2. (for example the bitmap config option inNativeAlloc) Is there a reason that these are not in the SDK given out to developers?

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  • PostgreSQL or MS SQL Server?

    - by mmiika
    I'm considering using PostgreSQL with a .Net web app. Basically 3 reasons: Mature Geo Queries Small footprint + Linux Price I'm wondering a bit about tools though, SQL Server Profiler and query plans and performance monitors have been helpful. How is this world with Postgres? Some other things I should consider? Edit: Will most likely use NHibernate as ORM

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  • Fast find near users using PostGIS

    - by opedge
    I have 5 tables: - users - information about user with current location_id (fk to geo_location_data) - geo_location_data - information about location, with PostGIS geography(POINT, 4326) column - user_friends - relationships between users. I want to find near friends for current user, but it takes a lot of time of executing select query to know if user is a friend and after that execute select using ST_DWithin.. May be something wrong in domain model or in queries?

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  • Database that consumes less disk space

    - by Hugo Palma
    I'm looking at solutions to store a massive quantity of information consuming the less possible disk space. The information structure is very simple and the queries will also be very simple. I've looked at solutions like Apache Cassandra and relations databases but couldn't find a comparison where disk usage is mentioned. Any ideas on this would be great.

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  • how to create a dynamic sql statement w/ python and mysqldb

    - by Elias Bachaalany
    I have the following code: def sql_exec(self, sql_stmt, args = tuple()): """ Executes an SQL statement and returns a cursor. An SQL exception might be raised on error @return: SQL cursor object """ cursor = self.conn.cursor() if self.__debug_sql: try: print "sql_exec: " % (sql_stmt % args) except: print "sql_exec: " % sql_stmt cursor.execute(sql_stmt, args) return cursor def test(self, limit = 0): result = sql_exec(""" SELECT * FROM table """ + ("LIMIT %s" if limit else ""), (limit, )) while True: row = result.fetchone() if not row: break print row result.close() How can I nicely write test() so it works with or without 'limit' without having to write two queries?

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  • weird FileField url in admin site

    - by panchicore
    My model class TheFile(models.Model): document = models.FileField(upload_to="archivos") The weird HTML admin link: <a hacking_google_maps_and_google_earth.pdf="" archivos="" media="" localhost:8000="" http:="" href="" target="_blank">archivos/Hacking_Google_Maps_And_Google_Earth.pdf</a> If I firebug-edit the href="" it works :S

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  • SQL Query Syntax : Using table alias in a count is invalid? Why?

    - by contactmatt
    Could someone please explain to me why the following query is invalid? I'm running this query against an Oracle 10g database. select count(test.*) from my_table test; I get the following error: ORA-01747: invalid user.table.column, table.column, or column specification however, the following two queries are valid. select count(test.column) from my_table test; select test.* from my_table test;

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  • video API iphone

    - by Manish
    Hi, I want to play H.264 video streamed from network. To play video iphone provides the media player API. Does anyone one aware of any documented or undocumented API for decoding and playing single video frame?

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  • Enumerating and using wmp visualizers

    - by monoceres
    Hi! I want to use the systems available windows media player visualizers in my app. Apperently visualizers expose an IWMPEffects interface to the world. My question is how do I enumerate and create instances to the available visualizers on my system? Probably it's just a process of getting the cslid of the visualizers and then create the instance with CoCreateInstance. However I have no idea how to get these clsid's! Thanks!

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  • Autocomplete server-side implementation

    - by toluju
    What is a fast and efficient way to implement the server-side component for an autocomplete feature in an html input box? I am writing a service to autocomplete user queries in our web interface's main search box, and the completions are displayed in an ajax-powered dropdown. The data we are running queries against is simply a large table of concepts our system knows about, which matches roughly with the set of wikipedia page titles. For this service obviously speed is of utmost importance, as responsiveness of the web page is important to the user experience. The current implementation simply loads all concepts into memory in a sorted set, and performs a simple log(n) lookup on a user keystroke. The tailset is then used to provide additional matches beyond the closest match. The problem with this solution is that it does not scale. It currently is running up against the VM heap space limit (I've set -Xmx2g, which is about the most we can push on our 32 bit machines), and this prevents us from expanding our concept table or adding more functionality. Switching to 64-bit VMs on machines with more memory isn't an immediate option. I've been hesitant to start working on a disk-based solution as I am concerned that disk seek time will kill performance. Are there possible solutions that will let me scale better, either entirely in memory or with some fast disk-backed implementations? Edits: @Gandalf: For our use case it is important the the autocompletion is comprehensive and isn't just extra help for the user. As for what we are completing, it is a list of concept-type pairs. For example, possible entries are [("Microsoft", "Software Company"), ("Jeff Atwood", "Programmer"), ("StackOverflow.com", "Website")]. We are using Lucene for the full search once a user selects an item from the autocomplete list, but I am not yet sure Lucene would work well for the autocomplete itself. @Glen: No databases are being used here. When I'm talking about a table I just mean the structured representation of my data. @Jason Day: My original implementation to this problem was to use a Trie, but the memory bloat with that was actually worse than the sorted set due to needing a large number of object references. I'll read on the ternary search trees to see if it could be of use.

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  • Deleting Duplicates in MySQL

    - by elmaso
    Query was this: CREATE TABLE `query` ( `id` int(11) NOT NULL auto_increment, `searchquery` varchar(255) NOT NULL default '', `datetime` int(11) NOT NULL default '0', PRIMARY KEY (`id`) ) ENGINE=MyISAM first I want to drop the table with: ALTER TABLE `querynew` DROP `id` and then delete the double entries.. I tried it with: INSERT INTO `querynew` SELECT DISTINCT * FROM `query` but with no success.. :( and with ALTER TABLE query ADD UNIQUE ( searchquery ) - is it possible to save the queries only one time?

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