7592f52d2e
## Proposed changes Add transaction for the operation of insert. It will cost less time than non-transaction(it will cost 1/1000 time) when you want to insert a amount of rows. ### Syntax ``` BEGIN [ WITH LABEL label]; INSERT INTO table_name ... [COMMIT | ROLLBACK]; ``` ### Example commit a transaction: ``` begin; insert into Tbl values(11, 22, 33); commit; ``` rollback a transaction: ``` begin; insert into Tbl values(11, 22, 33); rollback; ``` commit a transaction with label: ``` begin with label test_label; insert into Tbl values(11, 22, 33); commit; ``` ### Description ``` begin: begin a transaction, the next insert will execute in the transaction until commit/rollback; commit: commit the transaction, the data in the transaction will be inserted into the table; rollback: abort the transaction, nothing will be inserted into the table; ``` ### The main realization principle: ``` 1. begin a transaction in the session. next sql is executed in the transaction; 2. insert sql will be parser and get the database name and table name, they will be used to select a be and create a pipe to accept data; 3. all inserted values will be sent to the be and write into the pipe; 4. a thread will get the data from the pipe, then write them to disk; 5. commit will complete this transaction and make these data visible; 6. rollback will abort this transaction ``` ### Some restrictions on the use of update syntax. 1. Only ```insert``` can be called in a transaction. 2. If something error happened, ```commit``` will not succeed, it will ```rollback``` directly; 3. By default, if part of insert in the transaction is invalid, ```commit``` will only insert the other correct data into the table. 4. If you need ```commit``` return failed when any insert in the transaction is invalid, you need execute ```set enable_insert_strict = true``` before ```begin```.
92 lines
2.6 KiB
Markdown
92 lines
2.6 KiB
Markdown
---
|
|
{
|
|
"title": "SHOW TRANSACTION",
|
|
"language": "en"
|
|
}
|
|
---
|
|
|
|
<!--
|
|
Licensed to the Apache Software Foundation (ASF) under one
|
|
or more contributor license agreements. See the NOTICE file
|
|
distributed with this work for additional information
|
|
regarding copyright ownership. The ASF licenses this file
|
|
to you under the Apache License, Version 2.0 (the
|
|
"License"); you may not use this file except in compliance
|
|
with the License. You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing,
|
|
software distributed under the License is distributed on an
|
|
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
|
|
KIND, either express or implied. See the License for the
|
|
specific language governing permissions and limitations
|
|
under the License.
|
|
-->
|
|
|
|
# SHOW TRANSACTION
|
|
## description
|
|
|
|
This syntax is used to view transaction details for the specified transaction id or label name.
|
|
|
|
grammar:
|
|
|
|
```
|
|
SHOW TRANSACTION
|
|
[FROM db_name]
|
|
WHERE
|
|
[id = transaction_id]
|
|
[label = label_name];
|
|
```
|
|
|
|
Example return result:
|
|
|
|
```
|
|
TransactionId: 4005
|
|
Label: insert_8d807d5d-bcdd-46eb-be6d-3fa87aa4952d
|
|
Coordinator: FE: 10.74.167.16
|
|
TransactionStatus: VISIBLE
|
|
LoadJobSourceType: INSERT_STREAMING
|
|
PrepareTime: 2020-01-09 14:59:07
|
|
CommitTime: 2020-01-09 14:59:09
|
|
FinishTime: 2020-01-09 14:59:09
|
|
Reason:
|
|
ErrorReplicasCount: 0
|
|
ListenerId: -1
|
|
TimeoutMs: 300000
|
|
```
|
|
|
|
* TransactionId: transaction id
|
|
* Label: the label of the corresponding load job
|
|
* Coordinator: the node responsible for transaction coordination
|
|
* TransactionStatus: transaction status
|
|
* PREPARE: preparation stage
|
|
* COMMITTED: The transaction was successful, but the data is not visible
|
|
* VISIBLE: The transaction was successful and the data is visible
|
|
* ABORTED: transaction failed
|
|
* LoadJobSourceType: The type of the load job.
|
|
* PrepareTime: transaction start time
|
|
* CommitTime: the time when the transaction was successfully committed
|
|
* FinishTime: The time when the data is visible
|
|
* Reason: error message
|
|
* ErrorReplicasCount: Number of replicas with errors
|
|
* ListenerId: the id of the related load job
|
|
* TimeoutMs: transaction timeout time in milliseconds
|
|
|
|
## example
|
|
|
|
1. View the transaction with id 4005:
|
|
|
|
SHOW TRANSACTION WHERE ID = 4005;
|
|
|
|
2. Specify the db and view the transaction with id 4005:
|
|
|
|
SHOW TRANSACTION FROM db WHERE ID = 4005;
|
|
|
|
3. View the transaction with label `label_name`:
|
|
|
|
SHOW TRANSACTION WHERE LABEL = 'label_name';
|
|
|
|
## keyword
|
|
|
|
SHOW, TRANSACTION |