0
votes
1answer
32 views

How to ensure a trigger is fired after variable number of inserts?

I have a 1:N relationship between two tables - let's call them "foo" (the parent table) and "bar". I have some triggers on both "foo" and "bar" tables. I insert data in a single transaction, first to ...
0
votes
1answer
81 views

Circular foreign key deferrable cascade behavior

I am trying to determine what happens for a particular circular foreign key that will cascade delete. Please feel free to address any other possibilities that my inexperience has not listed. On my ...
2
votes
1answer
184 views

Complex constraint across all data in a table

We have a table to record processing that occurs on a system and we need to ensure that only a single row has an 'in process' status. I want to ensure that the result of this is always either zero or ...
1
vote
1answer
218 views

postgres+JDBC: fire trigger with non autocommit transaction

i have a jdbc client that make an two INSERT query on database whitout autocommit, and a trigger on database that fires when a insertion is done on a certain table public foo() throws MyException { ...
1
vote
2answers
297 views

Read Committed Isolation Level

Quote from docs: Read Committed is the default isolation level in PostgreSQL. When a transaction uses this isolation level, a SELECT query (without a FOR UPDATE/SHARE clause) sees only data ...
0
votes
1answer
367 views

postgres deadlock without explicit locking

I use PostgreSQL 9.2, and I do not use explicit locking anywhere, neither LOCK statement nor SELECT ... FOR UPDATE. However, recently I got ERROR: 40P01: deadlock detected. The query where deadlock ...
4
votes
2answers
581 views

Transactions, references and how to enforce double entry bookkeeping? (PG)

Double entry bookkeeping is a set of rules for recording financial information in a financial accounting system in which every transaction or event changes at least two different nominal ...
1
vote
1answer
105 views

Does PostgreSQL optimize queries in transaction?

In my app I need to make big imports from user files, and to achieve that all records are updated/created I do it inside transaction. But before it I need to update massive, already existing in DB, ...
1
vote
1answer
172 views

Postgresql Two-phase Commit Transaction Identifier

Is it possible to perform a two-phase commit in Postgresql when the databases exist on the same server? As a simple test, I would connect to the first database and run: BEGIN; PREPARE TRANSACTION ...
3
votes
2answers
828 views

How do I implement insert-if-not-found for transactions at serializable isolation level?

I'm having a hard time figuring out how to exactly implement a 'insert if not found' function. Consider the following. We have a table called artist with 2 columns, (name, id) where name is the ...
10
votes
1answer
378 views

Disable explicit commits in JDBC, detect them in SQL, or put the database in a readonly state

Background: I'm working on http://sqlfiddle.com (my site), and am trying to prevent one avenue of abuse possible there. I'm hoping that by asking about a problem I'm currently addressing, I don't ...
2
votes
1answer
792 views

Rotate a table in PostgreSQL

Problem description I need to rotate (with DROP and CREATE) a table which is heavily used by other clients. At present, I have a program which replaces (DROP + CREATE) this table. Sometimes, just ...