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| Transaction Lifespan | |
|---|---|
 | |
| xid | Transaction start id. Marks the logical beginning of the transaction. |
| iid | Invocation id. Marks the beginning of a statement within a transaction. |
| cid | Commit id. Marks the id at which transaction changes are visible to other transactions. |
The following table describes MVCC visibility rules in different isolation levels. Note that ClustrixDB does not support the read uncommitted level.
| Anchor | ||||
|---|---|---|---|---|
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ClustrixDB implements row level locks for transactions which touch a few rows at a time (a runtime configurable variable). For statements which affect a signification significant portion of a table, the query optimizer will promote row level locks to a table lock.
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