04-07-2020
My 'recent' speed increase commit, like 6 actual commits back, broke the actual creating of the user config file, which I didnt realize back then because I had forgotton to delete said file.
Next is the creating of the/a RAMDISK for RO systems, figured I dont need to copy SWARM over there, I just need to 'map' the semi-required files there.
With this said, I had lost track of the RO systems handling, allthough prepared....
Also I've copied to code to a laptop to work on that or a bit, which broke - for some weird reason - the application detection using
which, allthough
which is installed as well...
So, in a way, I'm back to square one again.
But that was to be expected after several years not using gnu+linux.
Gives me a chance to simplify and unify the 'init' procedure some more, hopefully
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LEARN ABOUT SUSE
prepare_transaction
PREPARE
TRANSACTION(7) SQL Commands PREPARE TRANSACTION(7)
NAME
PREPARE TRANSACTION - prepare the current transaction for two-phase commit
SYNOPSIS
PREPARE TRANSACTION transaction_id
DESCRIPTION
PREPARE TRANSACTION prepares the current transaction for two-phase commit. After this command, the transaction is no longer associated with
the current session; instead, its state is fully stored on disk, and there is a very high probability that it can be committed success-
fully, even if a database crash occurs before the commit is requested.
Once prepared, a transaction can later be committed or rolled back with COMMIT PREPARED [commit_prepared(7)] or ROLLBACK PREPARED [roll-
back_prepared(7)], respectively. Those commands can be issued from any session, not only the one that executed the original transaction.
From the point of view of the issuing session, PREPARE TRANSACTION is not unlike a ROLLBACK command: after executing it, there is no active
current transaction, and the effects of the prepared transaction are no longer visible. (The effects will become visible again if the
transaction is committed.)
If the PREPARE TRANSACTION command fails for any reason, it becomes a ROLLBACK: the current transaction is canceled.
PARAMETERS
transaction_id
An arbitrary identifier that later identifies this transaction for COMMIT PREPARED or ROLLBACK PREPARED. The identifier must be
written as a string literal, and must be less than 200 bytes long. It must not be the same as the identifier used for any currently
prepared transaction.
NOTES
This command must be used inside a transaction block. Use BEGIN [begin(7)] to start one.
It is not currently allowed to PREPARE a transaction that has executed any operations involving temporary tables, created any cursors WITH
HOLD, or executed LISTEN or UNLISTEN. Those features are too tightly tied to the current session to be useful in a transaction to be pre-
pared.
If the transaction modified any run-time parameters with SET (without the LOCAL option), those effects persist after PREPARE TRANSACTION,
and will not be affected by any later COMMIT PREPARED or ROLLBACK PREPARED. Thus, in this one respect PREPARE TRANSACTION acts more like
COMMIT than ROLLBACK.
All currently available prepared transactions are listed in the pg_prepared_xacts system view.
Caution:
It is unwise to leave transactions in the prepared state for a long time. This will interfere with the ability of VACUUM to reclaim
storage, and in extreme cases could cause the database to shut down to prevent transaction ID wraparound (see in the documentation).
Keep in mind also that the transaction continues to hold whatever locks it held. The intended usage of the feature is that a pre-
pared transaction will normally be committed or rolled back as soon as an external transaction manager has verified that other data-
bases are also prepared to commit.
If you have not set up an external transaction manager to track prepared transactions and ensure they get closed out promptly, it is
best to keep the prepared-transaction feature disabled by setting max_prepared_transactions to zero. This will prevent accidental
creation of prepared transactions that might then be forgotten and eventually cause problems.
EXAMPLES
Prepare the current transaction for two-phase commit, using foobar as the transaction identifier:
PREPARE TRANSACTION 'foobar';
SEE ALSO
COMMIT PREPARED [commit_prepared(7)], ROLLBACK PREPARED [rollback_prepared(7)]
SQL - Language Statements 2010-05-14 PREPARE TRANSACTION(7)