SHOW
Displays the Cassandra, CQL, and cqlsh versions, session host details, or tracing session details.
Use to display the Cassandra instance version, the session CQL and cqlsh versions, current session node information, and tracing session details captured in the past 24 hours.
Synopsis
SHOW VERSION | HOST | SESSION tracing_session_id
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. |
Option | Description |
---|---|
VERSION | The version, build number, and native protocol of the connected Cassandra instance, as well as the CQL specification version for cqlsh. |
HOST | The node details for the cqlsh session host. |
SESSION tracing_session_id | Request activity details for a specific query. Session ids are shown in the
query results and are recorded to the system_traces.sessions table. Note: All queries
run from a TRACING enabled cqlsh session are captured in the session and events
table and saved for 24 hours. After that time, the tracing information
time-to-live expires. |
Examples
Show the version
information.
SHOW VERSION
Reports the current versions for cqlsh,
Cassandra, CQL and the native
protocol.
[cqlsh 5.0.1 | Cassandra 2.1.0 | CQL spec 3.3 | Native protocol v3]
Show
the host information for the cqlsh session host.
SHOW HOST
Displays the host name, IP address, and port of the CQL shell session.
Connected to Test Cluster at 127.0.0.1:9042.
Show
the request activity details for a specific
session.
Sample output of SHOW SESSION
is:SHOW SESSION d0321c90-508e-11e3-8c7b-73ded3cb6170
Note: Use a
session id from the query results or from the system_traces.sessions table.
Tracing session: d0321c90-508e-11e3-8c7b-73ded3cb6170
activity | timestamp | source | source_elapsed
-----------------------------------------------------------------------------------------------------------------------------------------+--------------+-----------+----------------
execute_cql3_query | 12:19:52,372 | 127.0.0.1 | 0
Parsing CREATE TABLE emp (\n empID int,\n deptID int,\n first_name varchar,\n last_name varchar,\n PRIMARY KEY (empID, deptID)\n); | 12:19:52,372 | 127.0.0.1 | 153
Request complete | 12:19:52,372 | 127.0.0.1 | 650
. . .