Interface ITransactionalZoneTreeMaintenance<TKey, TValue>

The interface for the maintenance of a transactional ZoneTree.

Namespace: Tenray.ZoneTree
Assembly: ZoneTree.dll
Syntax
public interface ITransactionalZoneTreeMaintenance<TKey, TValue>
Type Parameters
Name Description
TKey

The key type
TValue

The value type

Properties

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TransactionLog

Transaction Log instance.

Declaration
ITransactionLog<TKey, TValue> TransactionLog { get; }
Property Value
Type Description
ITransactionLog<TKey, TValue>
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UncommittedTransactionIds

Retrieves uncommitted transaction ids.

Declaration
IReadOnlyList<long> UncommittedTransactionIds { get; }
Property Value
Type Description
IReadOnlyList<long>
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ZoneTree

Underlying non-transactional ZoneTree.

Declaration
IZoneTree<TKey, TValue> ZoneTree { get; }
Property Value
Type Description
IZoneTree<TKey, TValue>

Methods

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DestroyTree()

Removes the transactional tree from the universe. Destroys the tree, transaction logs, entire data and WAL store or folder.

Declaration
void DestroyTree()
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RollbackAllUncommitted()

Rollbacks all uncommitted transactions.

Declaration
int RollbackAllUncommitted()
Returns
Type Description
int

Count of rollbacked transactions.
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RollbackUncommittedTransactionIdsBefore(DateTime)

Rollbacks all uncommitted transaction ids started before given date-time. Transaction log memory usage increases by state uncommitted transaction ids. Those must be rollbacked.

Declaration
int RollbackUncommittedTransactionIdsBefore(DateTime dateTime)
Parameters
Type Name Description
DateTime dateTime

Max start time (exclusive)
Returns
Type Description
int

Count of rollbacked transactions.
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SaveMetaData()

Saves tree meta data and clears the meta wal record. After calling this method, the JSON meta file contains up to date tree meta data.

Saving meta file helps following:

  1. Reduce the size of meta wal file.
  2. Make Json meta file up to date to analyze parts of the LSM tree. Because Meta WAL file is not human readable.

It is up to user to decide when and how frequently save the meta file.

Declaration
void SaveMetaData()