Transaction_Control

All access to data stored in a database is done within a transaction. These functions are used to manage database transactions.

General

mco_trans_start

Start a database transaction

mco_trans_start_ex

Start a database transaction with an isolation level

mco_trans_upgrade

Upgrade to a READ_WRITE transaction

mco_trans_checkpoint

Insert updated objects into indexes prior to committing or rolling back the transaction

mco_trans_commit

Commit a transaction

mco_trans_commit_phase1

Commit phase 1 of a two-phase transaction

mco_trans_commit_phase2

Commit phase 2 of a two-phase transaction

mco_trans_iterate

Iterate over all modifications made by a transaction

mco_trans_no

Retrieve the “counter” number which uniquely identifies a transaction

mco_disk_confirm_transaction

Recover and commit a database transaction left in an “incomplete” state

mco_disk_reject_transaction

Reject (roll back) a database transaction left in an “incomplete” state

mco_trans_rollback

Abort a transaction

mco_trans_type

Return the type of a transaction referenced by the handle

mco_set_trans_callback

Assign a callback function to be called when a transaction is committed or rolled back

mco_trans_is_active

Check whether a database transaction is currently active

mco_trans_iterable

Enable or disable transaction iteration support for a database connection

mco_trans_set_options

Set transaction-specific options that apply only for the duration of the current transaction

MVCC Transaction Manager

mco_trans_get_supported_isolation_levels

Get the isolation levels supported by the current Transaction Manager

mco_trans_isolation_level

Get the isolation level of the current connection

mco_trans_set_default_isolation_level

Set the default isolation level for the current connection

mco_trans_set_unused_versions_limit

Set the maximum number of “unused versions” retained by the MVCC Transaction Manager

mco_trans_set_cleanup_period

Control how often the MVCC Transaction Manager removes unused versions

mco_trans_optimistic_threshold

Control the MVCC Transaction Manager behavior with respect to the number of conflicts

mco_trans_set_gc_policy

Set the garbage collection policy for the current connection