by Admin | Apr 14, 2015 | Database, Sessions / Connections, Transactions |
PostgreSQL has one problem which limits scalability. One process / session / connection can use only one CPU / core. Therefore if you want / need to run several queries / tasks / functions in parallel you have to use dblink functions to open more parallel connections...
by Admin | Apr 14, 2015 | Tables, Transactions |
This article summarizes information I have about this problem. I know that this is not all but I did not find such a summarization anywhere therefore I place it here. Maybe it could help to someone. Transaction ID has 32 bits. It means that after ID 2147483648...
by Admin | Apr 13, 2015 | Transactions |
I think this is really very well known. I add it here only as a reminder. In Oracle you can define “pragma autonomous_transaction” to force your procedure make changes in data regardless of any other pending transaction. This is really useful when you need...
by Admin | Mar 31, 2015 | Tables, Transactions |
Do you need to identify newly inserted records in some table? Of course you can add some special column of yours which you will update. But this solution is not much useful when you have really big amount of data because PostgreSQL deletes all old records and inserts...
by Admin | Mar 30, 2015 | Transactions |
Calculates average delay between checkpoints. SELECT total_checkpoints, seconds_since_start / total_checkpoints AS seconds_between_checkpoints, seconds_since_start / total_checkpoints / 60 AS minutes_between_checkpoints, seconds_since_start FROM (SELECT EXTRACT(EPOCH...
by Admin | Mar 30, 2015 | Transactions |
Simple select to show PostgreSQL settings for WAL (write ahead log) select * from pg_settings where name like '%wal%'
