Re: transaction_isolation vs. default_transaction_isolation

Josh Berkus <josh@agliodbs.com> wrote:

> default_transaction_isolation
> default_transaction_read_only

They are settings of transaction_isolation and transaction_read_only
for *next* transactions, no?

> transaction_isolation
> transaction_read_only

Non-default versions are almost read-only variables
because we can set them at the beginning of transactions.

BEGIN;
SET transaction_isolation = 'serializable';
SET default_transaction_isolation = 'read committed';
SHOW transaction_isolation;   => serializable
SHOW default_transaction_isolation;   => read committed
COMMIT;
-- next transaction uses default_transaction_isolation
SHOW transaction_isolation;   => read committed

Regards,
---
ITAGAKI Takahiro
NTT Open Source Software Center