SERIAL CONSISTENCY
Sets consistency for lightweight transactions (LWT).
Sets consistency for lightweight transaction. LWT use IF EXISTS and IF NOT EXISTS. Valid
values are: SERIAL
and LOCAL_SERIAL
.
Tip: To set the consistency level of non-lightweight transaction, see CONSISTENCY.
Synopsis
SERIAL CONSISTENCY [level]
Syntax conventions | Description |
---|---|
UPPERCASE | Literal keyword. |
Lowercase | Not literal. |
Italics |
Variable value. Replace with a user-defined value. |
[] |
Optional. Square brackets ( [] ) surround optional command
arguments. Do not type the square brackets. |
( ) |
Group. Parentheses ( ( ) ) identify a group to choose from. Do
not type the parentheses. |
| |
Or. A vertical bar ( | ) separates alternative elements. Type
any one of the elements. Do not type the vertical bar. |
... |
Repeatable. An ellipsis ( ... ) indicates that you can repeat
the syntax element as often as required. |
'Literal string' |
Single quotation ( ' ) marks must surround literal strings in
CQL statements. Use single quotation marks to preserve upper case. |
{ key : value } |
Map collection. Braces ( { } ) enclose map collections or key
value pairs. A colon separates the key and the value. |
<datatype1,datatype2> |
Set, list, map, or tuple. Angle brackets ( < > ) enclose
data types in a set, list, map, or tuple. Separate the data types with a comma.
|
cql_statement; |
End CQL statement. A semicolon ( ; ) terminates all CQL
statements. |
[--] |
Separate the command line options from the command arguments with two hyphens (
-- ). This syntax is useful when arguments might be mistaken for
command line options. |
' <schema> ... </schema> ' |
Search CQL only: Single quotation marks ( ' ) surround an
entire XML schema declaration. |
@xml_entity='xml_entity_type' |
Search CQL only: Identify the entity and literal value to overwrite the XML element in the schema and solrConfig files. |
Examples
Display current SERIAL CONSISTENCY
status.
SERIAL CONSISTENCY
Reports the current
setting.
Current serial consistency level set to SERIAL.
Set the serial consistency level with a
value.
SERIAL CONSISTENCY LOCAL_SERIAL
Confirms the level is
set.
Serial consistency level set to LOCAL_SERIAL.
Note: Trace transactions to compare the difference between INSERT statements with and without
IF EXISTS.
Write data using IF NOT EXISTS.
INSERT INTO cycling.cyclist_name (id, firstname , lastname ) VALUES (e7ae5cf3-d358-4d99-b900-85902fda9bb0,'Alex','FRAME' ) IF NOT EXISTS ;
Since the record already exists, the insert is not applied.
[applied] | id | firstname | lastname
-----------+--------------------------------------+-----------+----------
False | e7ae5cf3-d358-4d99-b900-85902fda9bb0 | Alex | FRAME