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  • Non-auto-increment rails/postgresql column

    - by Redian
    I'm trying to have a model/table with duplicate information in it. The reason for this is so that the same data can be written to the table under different users and found for each user. However, I want a quick easy way to identify which information is a duplicate of other information. I think the best way to do this would be to have an item_id of sorts that increments with each "set" of entries to the table. Is there a way to do this without including another table that stores the information without attributing it to users?

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  • String literals and escape characters in postgresql

    - by rjohnston
    Attempting to insert an escape character into a table results in a warning. For example: create table EscapeTest (text varchar(50)); insert into EscapeTest (text) values ('This is the first part \n And this is the second'); Produces the warning: WARNING: nonstandard use of escape in a string literal (Using PSQL 8.2) Anyone know how to get around this?

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  • PHP syntax for postgresql Mixed-case table names

    - by yam
    I have a code below: <?php require "institution.php" /* in this portion, query for database connection is executed, and */ $institution= $_POST['institutionname']; $sCampID = 'SELECT ins_id FROM institution where ins_name= '$institution' '; $qcampID = pg_query($sCampID) or die("Error in query: $query." . pg_last_error($connection)); /* this portion outputs the ins_id */ ?> My database before has no mixed-case table names, that's why when I run this query, it shows no error at all. But because I've changed my database for some reasons, and it contains now mixed-case table names, i have to change the code above into this one: $sCampID = 'SELECT ins_id FROM "Institution" where ins_name= '$institution' '; where the Institution has to be double quoted. The query returned parse error. When i removed this portion: where ins_name= '$institution', no error occured. My question is how do I solve this problem where the table name which contains a mixed-case letter and a value stored in a variable ($institution in this case) will be combined in a single select statement? Your answers and suggestions will be very much appreciated.

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  • Strange postgresql behavior

    - by Sergey
    Hi can someone explain me why it works like this? = select client_id from clients_to_delete; ERROR: column "client_id" does not exist at character 8 but, when putting this inside an IN()... = select * from orders where client_id in(select client_id from clients_to_delete); it works! and select all rows in the orders table. Same when running delete/update. Why it doesn't produce an error like before? Thank you!

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  • Postgresql full text search part of words

    - by Grezly
    Is postresql capable of doing a full text search, based on 'half' a word? For example i'm trying to seach foor tree, but i tell postgres to search for 'tr'. I can't find such a solution that is capable of doing this. Currently i'm using this select * from test, to_tsquery('tree') as q where vectors @@ q ; But i like to do something like this: select * from test, to_tsquery('tr%') as q where vectors @@ q ;

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  • Stored Procedure in postgresql, multiple queries w/ agreggates.

    - by fenix
    I'm trying to write a store procedure that can take some input parameters (obviously), run multiple queries against those, taking the output from those and doing calculations, and from those calculations and the original queries, outputting a formatted text string like: Number of Rows for max(Z) matching condition x and y of total rows matching x (x&y/x*100). To explain the max(Z) bit, this will be the username field, it won't matter which actual entry is picked, because the where clause will filter the results by user id, is there a saner way to do this?

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  • Return multiple results using dynamic sql (postgresql 8.2)

    - by precose
    I want to loop through schemas and get a result set that looks like this: Count 5 834 345 34 984 However, I can't get it to return anything using dynamic sql...I've tried everything but 8.2 is being a real pain. Here is my function: CREATE OR REPLACE FUNCTION dwh.adam_test4() RETURNS void LANGUAGE plpgsql AS $function$ DECLARE myschema text; rec RECORD; BEGIN FOR myschema IN select distinct c.table_schema, d.p_id from information_schema.tables t inner join information_schema.columns c on (t.table_schema = t.table_schema and t.table_name = c.table_name) join dwh.sgmt_clients d on c.table_schema = lower(d.userid) where c.table_name = 'fact_members' and c.column_name = 'debit_card' and t.table_schema NOT LIKE 'pg_%' and t.table_schema NOT IN ('information_schema', 'ad_delivery', 'dwh', 'users', 'wand', 'ttd') order by table_schema LOOP EXECUTE 'select count(ucic) from '|| myschema || '.' ||'fact_members where debit_card = ''yes''' into rec; RETURN rec; END LOOP; END $function$

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  • IntegrityError with Booleand Fields and Postgresql

    - by xRobot
    I have this simple Blog model: class Blog(models.Model): title = models.CharField(_('title'), max_length=60, blank=True, null=True) body = models.TextField(_('body')) user = models.ForeignKey(User) is_public = models.BooleanField(_('is public'), default = True) When I insert a blog in admin interface, I get this error: IntegrityError at /admin/blogs/blog/add/ null value in column "is_public" violates not-null constraint Why ???

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  • Querying Postgresql with a very large result set

    - by sanity
    In an application I need to query a Postgres DB where I expect tens or even hundreds of millions of rows in the result set. I might do this query once a day, or even more frequently. The query itself is relatively simple, although may involve a few JOINs. My question is: How smart is Postgres with respect to avoiding having to seek around the disk for each row of the result set? Given the time required for a hard disk seek, this could be extremely expensive. If this isn't an issue, how does Postgres avoid it? How does it know how to lay out data on the disk such that it can be streamed out in an efficient manner in response to this query?

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  • I think I have multiple postgresql servers installed, how do I identify and delete the 'extra' ones?

    - by Guided33
    I seem to have a few installations of postgresql on my machine somehow. I'm not sure if this is a mistake or, if Ubuntu for some odd reason duplicates direcotories and keeps them elsewhere. I have a postgresql directory in /etc one in /usr/lib and one in /opt I'm properly confused at this point. How do I go about deleting the extra ones.which ones are he extra one? I also need to make sure that my 'pg' gem in my rails env is pointing towards the correct posgresql db server. Any thoughts on my issue would be huge.

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  • How do I fix "Library not loaded: libssl.1.0.0.dylib" with PostgreSQL?

    - by Simpleton
    After deleting Macports, I've had some strange behaviour. When I try to run PostgreSQL via CLI, I get: pawel:~ pawel$ psql dyld: Library not loaded: /opt/local/lib/libssl.1.0.0.dylib Referenced from: /usr/local/bin/psql Reason: image not found Trace/BPT trap This is strange because I've installed Postgresql through Homebrew and running brew list confirms that it's there. How would I get psql to work again? Additionally, trying to install the pg gem fails due to an file not found: /opt/local/lib/libssl.1.0.0.dylib error. I need to make Postgres not look in the /opt/local/ directory for this file.

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  • PostgreSQL under Mac OSX Lion. Wrong userpass?

    - by Matt
    I'm completely helpless, maybe you guys can help me out. I installed PostgreSQL under my new MacOSX Lion. When I try to connect to my localhost with pgAdminIII.app it says: Error connecting to the database: FATAL password authentication failed for user postgres I just have no idea what to do? Non of my passwords work. Neither my adminpass nor "postgres" nor anyhting else. I tried to install it again via the console where I found this helpful link: http://www.peerassembly.com/2011/08/...resql-on-lion/ However the problem is, that when I try to run createuser -a -d _postgres the same password problem appears again. I just can't seem to find a solution to this. Always wrong password. Btw. I have a new User called "PostgreSQL" on my machine after I installed postgres. Any ideas? I'm so stuck and I really need to make this work.

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  • SQLAlchemy - SQLite for testing and Postgresql for devlopment - How to port?

    - by StackUnderflow
    I want to use sqlite memory database for all my testing and Postgresql for my development/production server. But the SQL syntax is not same in both dbs. for ex: SQLite has autoincrement, and Postgresql has serial Is it easy to port the SQL script from sqlite to postgresql... what are your solutions? If you want me to use standard SQL, how should I go about generating primary key in both the databases?

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  • Is it possible to create a jdbc connection without a password (using postgresql 'trust')?

    - by mojones
    I am using jdbc to connect to a postgresql database in a java application (actually the app is written in Groovy). I have postgresql set up to use the 'trust' authentication method. Is it possible to open a jdbc connection without specifying a password? When I try to use the normal constructor with a blank password, it fails with Exception in thread "Thread-2" org.postgresql.util.PSQLException: FATAL: password authentication failed for user "myuser" Even though, from the command line, this works fine psql -U myuser mydatabase Welcome to psql 8.3.5, the PostgreSQL interactive terminal. Type: \copyright for distribution terms \h for help with SQL commands \? for help with psql commands \g or terminate with semicolon to execute query \q to quit

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  • How to set shmall, shmmax, shmni, etc ... in general and for postgresql

    - by jpic
    I've used the documentation from PostgreSQL to set it for example this config: >>> cat /proc/meminfo MemTotal: 16345480 kB MemFree: 1770128 kB Buffers: 382184 kB Cached: 10432632 kB SwapCached: 0 kB Active: 9228324 kB Inactive: 4621264 kB Active(anon): 7019996 kB Inactive(anon): 548528 kB Active(file): 2208328 kB Inactive(file): 4072736 kB Unevictable: 0 kB Mlocked: 0 kB SwapTotal: 0 kB SwapFree: 0 kB Dirty: 3432 kB Writeback: 0 kB AnonPages: 3034588 kB Mapped: 4243720 kB Shmem: 4533752 kB Slab: 481728 kB SReclaimable: 440712 kB SUnreclaim: 41016 kB KernelStack: 1776 kB PageTables: 39208 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 8172740 kB Committed_AS: 14935216 kB VmallocTotal: 34359738367 kB VmallocUsed: 399340 kB VmallocChunk: 34359334908 kB HardwareCorrupted: 0 kB AnonHugePages: 456704 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB DirectMap4k: 12288 kB DirectMap2M: 16680960 kB >>> ipcs -l ------ Shared Memory Limits -------- max number of segments = 4096 max seg size (kbytes) = 4316816 max total shared memory (kbytes) = 4316816 min seg size (bytes) = 1 ------ Semaphore Limits -------- max number of arrays = 128 max semaphores per array = 250 max semaphores system wide = 32000 max ops per semop call = 32 semaphore max value = 32767 ------ Messages Limits -------- max queues system wide = 31918 max size of message (bytes) = 8192 default max size of queue (bytes) = 16384 sysctl.conf extract: kernel.shmall = 1079204 kernel.shmmax = 4420419584 postgresql.conf non defaults: max_connections = 60 # (change requires restart) shared_buffers = 4GB # min 128kB work_mem = 4MB # min 64kB wal_sync_method = open_sync # the default is the first option checkpoint_segments = 16 # in logfile segments, min 1, 16MB each checkpoint_completion_target = 0.9 # checkpoint target duration, 0.0 - 1.0 effective_cache_size = 6GB Is this appropriate ? If not (or not necessarily), in which case would it be appropriate ? We did note nice performance improvements with this config, how would you improve it ? How should kernel memory management parameters be set ? Can anybody explain how to really set them from the ground up ?

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  • How to verify PostgreSQL 9 has installed correctly on a CentOS server?

    - by A4J
    I'm trying to install the PG (postgres) gem on a CentoOS server, but it keeps saying Postgres is too old, even though I have upgraded it to 9.1.3 (as per the instructions here http://www.davidghedini.com/pg/entry/install_postgresql_9_on_centos). I am using CentOS 5.8 (and Ruby 1.9.3) Here is the error message: Building native extensions. This could take a while... ERROR: Error installing pg: ERROR: Failed to build gem native extension. /usr/local/bin/ruby extconf.rb checking for pg_config... yes Using config values from /usr/bin/pg_config checking for libpq-fe.h... yes checking for libpq/libpq-fs.h... yes checking for pg_config_manual.h... yes checking for PQconnectdb() in -lpq... yes checking for PQconnectionUsedPassword()... no Your PostgreSQL is too old. Either install an older version of this gem or upgrade your database. *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. psql --version confirms my version: psql (PostgreSQL) 9.1.3 I can confirm packages installed: Setting up Install Process Package postgresql91-9.1.3-1PGDG.rhel5.x86_64 already installed and latest version Package postgresql91-devel-9.1.3-1PGDG.rhel5.x86_64 already installed and latest version Package postgresql91-server-9.1.3-1PGDG.rhel5.x86_64 already installed and latest version Package postgresql91-libs-9.1.3-1PGDG.rhel5.x86_64 already installed and latest version Package postgresql91-contrib-9.1.3-1PGDG.rhel5.x86_64 already installed and latest version Nothing to do Any ideas on how to troubleshoot this? Thanks in advance.

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  • How to optimize a postgreSQL server for a "write once, read many"-type infrastructure ?

    - by mhu
    Greetings, I am working on a piece of software that logs entries (and related tagging) in a PostgreSQL database for storage and retrieval. We never update any data once it has been inserted; we might remove it when the entry gets too old, but this is done at most once a day. Stored entries can be retrieved by users. The insertion of new entries can happen rather fast and regularly, thus the database will commonly hold several millions elements. The tables used are pretty simple : one table for ids, raw content and insertion date; and one table storing tags and their values associated to an id. User search mostly concern tags values, so SELECTs usually consist of JOIN queries on ids on the two tables. To sum it up : 2 tables Lots of INSERT no UPDATE some DELETE, once a day at most some user-generated SELECT with JOIN huge data set What would an optimal server configuration (software and hardware, I assume for example that RAID10 could help) be for my PostgreSQL server, given these requirements ? By optimal, I mean one that allows SELECT queries taking a reasonably little amount of time. I can provide more information about the current setup (like tables, indexes ...) if needed.

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  • Prepared transactions with Postgres 8.4.3 on CentOS

    - by peter
    I have set 'max_prepared_transactions' to 20 in the local postgres.config and yet the transaction fails with the following error trace (but only on Linux). Since in Windows the same code works seamlessly I am wandering if this isn't an issue of permission. What would be the solution? Thanks Peter 372300 [Atomikos:7] WARN atomikos - XA resource 'XADBMS': rollback for XID '3137332E3230332E3132362E3139302E746D30303030313030303037:3137332E3230332E3132362E3139302E746D31' raised -3: the XA resource detected an internal error org.postgresql.xa.PGXAException: Error rolling back prepared transaction at org.postgresql.xa.PGXAConnection.rollback(PGXAConnection.java:357) at com.atomikos.datasource.xa.XAResourceTransaction.rollback(XAResourceTransaction.java:873) at com.atomikos.icatch.imp.RollbackMessage.send(RollbackMessage.java:90) at com.atomikos.icatch.imp.PropagationMessage.submit(PropagationMessage.java:86) at com.atomikos.icatch.imp.Propagator$PropagatorThread.run(Propagator.java:62) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:651) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:676) at java.lang.Thread.run(Thread.java:595) Caused by: org.postgresql.util.PSQLException: ERROR: prepared transaction with identifier "1096044365_MTczLjIwMy4xMjYuMTkwLnRtMDAwMDEwMDAwNw==_MTczLjIwMy4xMjYuMTkwLnRtMQ==" does not exist at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2062) at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1795) at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:257) at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:479) at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:353) at org.postgresql.jdbc2.AbstractJdbc2Statement.executeUpdate(AbstractJdbc2Statement.java:299) at org.postgresql.xa.PGXAConnection.rollback(PGXAConnection.java:347)

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  • How do I make a script that properly introduces hstore in both 9.0 and 9.1?

    - by Igor Zinov'yev
    I am trying to introduce the hstore type into the database of a project I'm developing. But the problem is that I have a slightly newer version of the Postgres server installed on my development machine than there is on the production machine. While I can simply execute the CREATE EXTENSION command locally, this command is unavailable on the production machine. Is there a way to create a script that will install hstore both on 9.1 and 9.0?

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  • Convert executed SQL result to a list of Model object

    - by huynq9
    I'm wondering that is it possible to convert the executed query result to a list of models. I'm using Ruby with ActiveRecord and need to execute custom SQL query to join two or many tables. The code looks like below: connection = ActiveRecord::Base.connection sql = "select T1.f1, T2.f2 from T1 left join T2 on T1.id = T2.id" @result = connection.execute(sql) In Ruby code, I defined a models to manage the executed SQL result: class Model property :f1, :f2 end Is there any way to convert @result to list of Model object? so I can deal with each item in the list as following @result.each do |item| puts item.f1 puts item.f2 end

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  • Running a java program in linux terminal with -class path

    - by Arya
    Hello I've been trying for an hour to run the following program with a the postgresql classpath class Test{ public static void main(String[] args){ try { Class.forName("org.postgresql.Driver"); } catch (ClassNotFoundException cnfe) { System.err.println("Couldn't find Postgresql driver class!"); } } } The program compiled fine with the javac command, but I'm having a hard time running it with the postgresql classpath. I have "postgresql-9.0-801.jdbc4.jar" in the same directory as the file and I tried the following, but non of them worked java -classpath ./postgresql-9.0-801.jdbc4.jar Test java -classpath postgresql-9.0-801.jdbc4.jar Test java -classpath "postgresql-9.0-801.jdbc4.jar" Test What am I doing wrong? Regards!

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  • Why can I create a table with PRIMARY KEY on a nullable column?

    - by AlexKuznetsov
    The following code creates a table without raising any errors: CREATE TABLE test( ID INTEGER NULL, CONSTRAINT PK_test PRIMARY KEY(ID) ) Note that I cannot insert a NULL, as expected: INSERT INTO test VALUES(1),(NULL) ERROR: null value in column "id" violates not-null constraint DETAIL: Failing row contains (null). ********** Error ********** ERROR: null value in column "id" violates not-null constraint SQL state: 23502 Detail: Failing row contains (null). Why can I create a table with a self-contradictory definition? ID column is explicitly declared as NULLable, and it is implicitly not nullable, as a part of the PRIMARY KEY. Does it make sense? Edit: would it not be better if this self-contradictory CREATE TABLE just failed right there?

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