PostgreSQL is a powerful, enterprise class, open source RDBMS. It has more than 15 years of active development and a proven architecture that has earned it a strong reputation for reliability and data integrity. It runs on all major operating systems, including Linux, UNIX and Windows. It prides ...
4
votes
0answers
68 views
Does PgBouncer create a separate pool for every database config entry?
If I set up a pgbouncer.ini config file with several database entries, does pgBouncer create a separate pool for each one? I would think so, but have not been able to confirm this.
For example, ...
4
votes
0answers
37 views
Postgres TupleTable like data structure
I'm writing my own Group by operator (non-hashed implementation) and I'm currently looking on a good data structure to store the result groups. There are two requirement in my mind: the table need to ...
3
votes
0answers
39 views
What happen when Postgresql tablespace is null?
I'm facing a DWH on postgresql with no DBA (I'm not one) so I turn to you with hope to figure this issue/s.
Long story short, when I check the disk usage per tablespace, I get different distribution ...
3
votes
0answers
46 views
How to count selectivity rows in PostgreSQL 8.2
I have problem with two queries on PostgreSQL v8.2. It seem like the optimizer chooses a wrong index:
db=# explain
select count(*), messagetype, alias
from event
where
templateinfoid = 10 and ...
3
votes
0answers
63 views
Streaming Replication Failover - how to point second slave at new master?
I have a Postgres database HA cluster I've set up in a lab. I'm using PgPool-II to manage fail-over.
For the cluster itself, I have three identical Postgres 9.2 servers set up like so:
Server A - ...
3
votes
0answers
23 views
Does avg_query for PgBouncer include update and inserts?
Trying to tune our application and would like to know if the stats data that pgBouncer shows as avg_query, according to the PgBouncer docs on usage:
avg_query
Average query duration in ...
2
votes
0answers
32 views
Postgres caching and bytea
I have a DB which, among other things, stores images (as bytea, if that's interesting). It also stores users' metadata, activity logs, etc., but images currently take 500MB out of the total 600MB ...
2
votes
0answers
72 views
How to properly configure pgBouncer transaction level pooling?
What is a good way to determine the number of available transaction connections when using pgBouncer to pool database connections? Also, how should I determine the number of max_connections and ...
2
votes
0answers
37 views
What is the equivalent of a “Certificate of Destruction” when using a cloud-hosted database?
We have a Rails application hosted by Heroku and using an Heroku Postgres database. Some of the information we store is considered to be sensitive by our users, and we've been asked if we can provide ...
2
votes
0answers
178 views
“custom archiver out of memory” error when restoring large DB using pg_restore
I'm trying to a restore a local copy of a 30GB DB (with only one table) dumped using the Heroku wrappers (described here) using pg_restore. The Heroku DB is using 9.1.7 and I have had the same result ...
2
votes
0answers
145 views
PostgreSQL 9.2.1 out of memory on \COPY
I'm running a postgreSQL 9.2.1 installation in a FreeBSD 9.0 Jail with default settings.
I've configured loader.conf according to this post: ...
1
vote
0answers
20 views
pg_restore and psql asks password for restoring dump file
This will be probably extreme novice question but I want to restore a .backup dump file. I have tried the following command:
pg_restore -i -h localhost -p 5432 -U postgres -d old_db -v ...
1
vote
0answers
27 views
Performance of database with transactional data
There are lots of row modifications (several thousands of rows per minute) in our PostgreSQL database that stores transactional data. We have a problem because PostgreSQL runs vacuuming process and ...
1
vote
0answers
54 views
Configuring PostgreSQL for read performance
Our system write a lots of data (kind of Big Data system). The write performance is good enough for our needs but the read performance is really too slow.
The primary key (constraint) structure is ...
1
vote
0answers
20 views
Can't set up witness in Repmgr 2.0
I am trying to setup repmgr using the autofailover quick setup tutorial provided on Github Link
But I am kind of stuck on the witness section, when trying to create the witness with repmgr -d repmgr ...
1
vote
0answers
28 views
PostgreSQL datasource URL?
My first attempt to use PostgreSQL:
I have the elephant icon on the top right: running on port 5432.
I want to use LibreOffice as an interface:
Connect to an existing database: PostgreSQL
...
1
vote
0answers
30 views
Failover - automatic switching between servers in Postgresql 9.1
I'm pretty new to Postgresql 9.1 and failover replication. We have a simple master-slave setup, for failover replication, which our application (client) is connected to. On a failure of the master, ...
1
vote
0answers
36 views
PGPool Frequent Queries
We recently setup a PostgreSQL Cluster with PGPool in front of it. This is our first go at such a thing. We setup our QA environment to use the new PGPool, and we cranked up the logging on the ...
1
vote
0answers
34 views
Write performance of Postgresql 9.1 with read-only slave
I have a Postgresql 9.1 database that is being hosted by Heroku. It currently has a read-only "follower". I need to truncate several large tables (over 100GB) of data and reloads them. Is the ...
1
vote
0answers
25 views
MySQL Federated acces to PostgreSQL table
For example 2 DBases:
DBMS Postgresql
DBMS MySQL
In each DB include one DB and one table in it. Can I work with table in PostgreSQL through MySQL?
Is it possible to link as federated postgresql ...
1
vote
0answers
35 views
Inheritance and its alternatives in PostgreSQL
I make an archaeological database in PostgreSQL 9.2. The description of archaeological context has a subdivision between different types of context. I'm not sure how to implement it:
1) to violate ...
1
vote
0answers
77 views
SOLVED: Postgres 8.4.5: Bad query plan vs Good query plan when changing date range on large data table
SOLVED.
I was able to resolve this issue by altering the time.date column to allow 1000 stats: ALTER TABLE time ALTER COLUMN date SET STATISTICS 1000;
Now the queries are running very fast, down to ...
1
vote
0answers
31 views
postgresql 8.3 possible checkpoint and memory misconfiguration
I am using postgresql 8.3 in a read/write heavy application where data are being written to the database from a background process while they are also being read/written from a web application.
At ...
1
vote
0answers
88 views
Remote connection to PostgresSQL in Windows 2008 Server is prompting the error below
The error:
"Unable to read data from the transport connection. an existing connection was forcibly
closed by the remote host."
The conditions:
1) I have the following connection string:
...
1
vote
0answers
31 views
After streaming replication has failed, how to get it back again?
I have a similar problem to this: Replication has failed; how to get going on again?
Essentially my slave failed, and now complains "requested WAL segment 0000000100000135000000E4 has already been ...
1
vote
0answers
155 views
Is there a Postgres admin GUI that can execute a master file containing multiple sql files
I'm developing a really long script. I'd like to break the script into smaller, more manageable scripts and include each sql file in a master file, then just execute the master file.
example: ...
1
vote
0answers
66 views
Does spgist extension in PostgreSQL 9.2.3 support float or int array?
SP-GiST is an abbreviation for space-partitioned GiST in PostgreSQL 9.2.3. It can be used to find the similar tuple by creating the sp-gist index on the column.
e.g:
create index pt_spgist_idx on ...
1
vote
0answers
71 views
Can PostgreSQL's COPY create CSV with Locale-specific number formatting?
I want to create a CSV with PostgreSQL 9.1 COPY that directly opens correctly with a double-click in crazy German Excel 2010. Using ";"-Delimiter is easy.
The encoding is solved, but Excel only ...
1
vote
0answers
130 views
How to calculate running total based on dynamic values?
I need to calculate the running total in which the target column is changing along with the time. Its something which aws does. Charging based for only what you use. So how do I aggregate sum of ...
1
vote
0answers
48 views
PostgreSQL Fuzzymatching Error
I get such errors when using these functions, what's is wrong?
pgdb=# SELECT distance('foo','zoo');
ERROR: parse error - invalid geometry
LINE 1: SELECT distance('foo','zoo');
...
1
vote
0answers
157 views
Finding the bottleneck by analyzing Munin graphs
We’ve been experiencing some issues with our database server during peak hours. In our Nginx error-log we can see that a lot of requests get timed out. The requests are also very slow. We have had ...
1
vote
0answers
38 views
Slave as a master in PostgreSQL
I have set up a hot standby in PostgreSQL 9.0 on Windows.
I want that, at the time of fail-over, the slave should take over the role of master and start performing operations (both read and write) ...
1
vote
0answers
144 views
When using a master plus multiple slaves, how do I change over from one server to a brand new one with minimal downtime?
In my particular case, I'm using Heroku Postgres (repackaged Amazon EC2 instances running PostgreSQL), but platform-agnostic answers are also good!
Heroku's instructions
describe the process for ...
1
vote
0answers
70 views
Bucardo stops sync when node is offline
I'm using Bucardo 4.4.8 to replicate two PG DBs to one central master. My problem is the same as was posted back in 2011 here
...
1
vote
0answers
132 views
PostGIS: Remove stale/obsolete geometry columns from the geometry_columns table
I understand that the function Populate_Geometry_Columns() inserts records in the geometry_columns table for geometry columns that are not yet listed there. However, an invocation of ...
0
votes
0answers
7 views
Postgres backup and WAL to S3
We are looking for a solution for the following problem:
We have set up streaming replication so we have a master DB and a slave DB, we want to have basebackups and WAL files sent to our S3 storage ...
0
votes
0answers
25 views
How to make continues cluster?
I have a report table with the following index:
providerid, date
The table is around 30M records and it grows about 100K rows per day.
I want to use in the index above as a cluster, but as I ...
0
votes
0answers
24 views
Gathering data from independent databases to a central one
I need to do the following. In a LAN there are 4 postgres boxes each having a small postgres database. These servers are gathering data from the internet and insert them as records in a table in their ...
0
votes
0answers
26 views
Performance of large queries on low bandwidth connections
I've been running some measurements on bandwidth needs and the effects of latency on query performance against Postgres 8.3 (waiting for management to approve upgrade) on Windows. SELECTs of various ...
0
votes
0answers
11 views
Streaming replication in postgresql 9.1 — sender and receiver processes aren't running
I've followed this guide, and cross-referenced the primary postgresql wiki in order to set up replication. I've configured postgresql.conf and pg_hba.conf as directed, and then restarted the master ...
0
votes
0answers
31 views
Encryption in PostgreSQL
Does PostgreSQL support data encryption features at transactional and the table level of database? If yes, how?
Oracle provides this via database and network encryption. Oracle provides encryption at ...
0
votes
0answers
28 views
Can't login phppgadmin
When I am trying login in phpgpadmin, it shows login failed. Yesterday (and on previous days) phppgadmin was working fine, but now I can't login.
If use the same username and password via PHP code, ...
0
votes
0answers
57 views
Writing with multiple psql processes to database seems to damage data
I have a couple terabytes of CSV data that I am trying to import into a PostgreSQL 8.4 database (on a RedHat 6.2 server), whose data directory is initialized on a multipath hardware RAID. There are ...
0
votes
0answers
41 views
pg_dump from 9.2 to 8.4
I'm trying to restore a db dump from PostgreSQL 9.2 to PostgrSQL 8.4
(from separate machines, both are running Windows 7).
I followed the instructions in this answer:
Use pg_restore to restore from ...
0
votes
0answers
85 views
Performance difference between MySQL and PostgreSQL for the same schema/queries
I'm a newbie DBA, and I have experience in Microsoft SQL Server but I want to jump to FLOSS.
I'm starting a company, and we develop an app (PHP) with a Postgres backend, and we did some tests ...
0
votes
0answers
49 views
PostgreSQL: Slave doesn't replicate the Master's data
I'm using PostgreSQL 9.2.3 on both computers, both of which run Win2008R2. I've setup streaming replication by following this guide: ...
0
votes
0answers
28 views
Should I keep pg_xlog on the same disk as data if using disk snapshotting?
We're running on EBS volumes on EC2. We're interested in leveraging
EBS snapshotting for backups. However, does this mean we'd need to
ensure our pg_xlog is on the same EBS volume as our data?
(I ...
0
votes
0answers
15 views
Identical Postgres index scan taking 5x longer on server
I have an intermediate table for managing a many-to-many relation between tables called Expert and Subject:
Column | Type | Modifiers
...
0
votes
0answers
32 views
Define default operator class for gist on enum data type
I have my own enum data type (called direction), which can be IN or OUT and I want to use EXCLUDE USING gist constraint to prevent inserting row with the same direction (and two more columns) like ...
0
votes
0answers
50 views
How I can copy from local file to remote DB in PostgreSQL?
I am a novice in psql and need some help.
How can I load a local CSV to a remote DB?
I am using the following command
\COPY test(user_id, product_id, value)
FROM '/Users/testuser/test.tsv' ...
