| Modifier and Type | Field and Description |
|---|---|
| private AccessFactory | |
| protected BTree | |
| private long |
| Access | Constructor and Description |
|---|---|
| pack-priv |
| Modifier and Type | Method and Description |
|---|---|
| private final void | |
| private final DataValueDescriptor[] | |
| private final OpenBTree | openIndex(TransactionManager internal_xact, int
For table level use TransactionManager.MODE_TABLE,
for row level use TransactionManager.MODE_RECORD lock_level, int For table level use LockingPolicy.MODE_CONTAINER,
for row level use LockingPolicy.MODE_RECORD lock_mode)Open index for either table level or row level update. |
| public int | Returns: Returns Serviceable.DONE when work has completed, or returns Serviceable.REQUEUE if work needs to be requeued.the context manager started by the
post commit daemon contextMgr)Implements org. perform the work described in the postcommit work. |
| private final DataValueDescriptor[] | purgeCommittedDeletes(OpenBTree
The btree already opened. open_btree, long The page number of the page to look for committed deletes. pageno)Reclaim space taken up by committed deleted rows. |
| private final void | purgeRowLevelCommittedDeletes(OpenBTree
The already open btree, which has been locked with IX
table lock, to use to get latch on page. open_btree)Attempt to reclaim committed deleted rows from the page with row locking. |
| public boolean | Returns: false, this work should not be serviced ASAPImplements org. The urgency of this post commit work. |
| public boolean | serviceImmediately()
Implements org. If this work should be done immediately on the user thread then return true. |
| access_factory | back to summary |
|---|---|
| private AccessFactory access_factory | |
| btree | back to summary |
|---|---|
| protected BTree btree | |
| page_number | back to summary |
|---|---|
| private long page_number | |
| BTreePostCommit | back to summary |
|---|---|
| pack-priv BTreePostCommit(AccessFactory access_factory, BTree btree, long input_page_number) | |
| doShrink | back to summary |
|---|---|
| private final void doShrink(OpenBTree open_btree, DataValueDescriptor[] shrink_row) throws StandardException | |
| getShrinkKey | back to summary |
|---|---|
| private final DataValueDescriptor[] getShrinkKey(OpenBTree open_btree, ControlRow control_row, int slot_no) throws StandardException | |
| openIndex | back to summary |
|---|---|
| private final OpenBTree openIndex(TransactionManager internal_xact, int lock_level, int lock_mode) throws StandardException Open index for either table level or row level update.
| |
| performWork | back to summary |
|---|---|
| public int performWork(ContextManager contextMgr) throws StandardException Implements org. perform the work described in the postcommit work. In this implementation the only work that can be executed by this post commit processor is this class itself.
| |
| purgeCommittedDeletes | back to summary |
|---|---|
| private final DataValueDescriptor[] purgeCommittedDeletes(OpenBTree open_btree, long pageno) throws StandardException Reclaim space taken up by committed deleted rows. This routine assumes it has been called by an internal transaction which has performed no work so far, and that it has an exclusive table lock. These assumptions mean that any deleted rows encountered must be from committed transactions (otherwise we could not have gotten the exclusive table lock). This routine handles purging committed deletes while holding a table level exclusive lock. See purgeRowLevelCommittedDeletes() for row level purging.
| |
| purgeRowLevelCommittedDeletes | back to summary |
|---|---|
| private final void purgeRowLevelCommittedDeletes(OpenBTree open_btree) throws StandardException Attempt to reclaim committed deleted rows from the page with row locking. Get exclusive latch on page, and then loop backward through page searching for deleted rows which are committed. This routine is called only from post commit processing so it will never see rows deleted by the current transaction. For each deleted row on the page it attempts to get an exclusive lock on the deleted row, NOWAIT. If it succeeds, and since this transaction did not delete the row then the row must have been deleted by a transaction which has committed, so it is safe to purge the row. It then purges the row from the page. The latch on the leaf page containing the purged rows must be kept until after the transaction has been committed or aborted in order to insure proper undo of the purges can take place. Otherwise another transaction could use the space freed by the purge and then prevent the purge from being able to undo.
| |
| serviceASAP | back to summary |
|---|---|
| public boolean serviceASAP() Implements org. The urgency of this post commit work. This determines where this Serviceable is put in the post commit queue. Post commit work in the btree can be safely delayed until there is not user work to do.
| |
| serviceImmediately | back to summary |
|---|---|
| public boolean serviceImmediately() Implements org. Doc from org. If this work should be done immediately on the user thread then return true. If it doesn't make any difference if this work is done on a the user thread immediately or if it is performed by another thread asynchronously later, then return false.
| |