Cassandra 2 - CQL 3で既存のインデックスを一覧表示する

Question

特定のキースペースまたは列ファミリの既存のすべてのインデックスを一覧表示するCQLクエリはありますか？あなたは、システムの鍵空間を使用して、プライマリキーとセカンダリインデックス取得することができます

Answer 1

：

SELECT column_name, index_name, index_options, index_type, component_index 
FROM system.schema_columns 
WHERE keyspace_name='samplekp'AND columnfamily_name='sampletable'; 

服用を、例えば、以下の表の宣言：

CREATE TABLE sampletable (
key text, 
date timestamp, 
value1 text, 
value2 text, 
PRIMARY KEY(key, date)); 

CREATE INDEX ix_sample_value2 ON sampletable (value2); 

上記のクエリは何か、この結果になるだろう：

column_name | index_name  | index_options | index_type | component_index 
-------------+------------------+---------------+------------+----------------- 
     date |    null |   null |  null |    0 
     key |    null |   null |  null |   null 
     value1 |    null |   null |  null |    1 
     value2 | ix_sample_value2 |   {} | COMPOSITES |    1 

Answer 2

最も簡単な方法はDESC cオマンド

DESC TABLE "Table_Name"はあなたが望むものを取得します

Answer 3

cqlsh:system> show version 
[cqlsh 5.0.1 | Cassandra 2.1.2-SNAPSHOT | CQL spec 3.2.0 | Native protocol v3] 


cqlsh:system> desc table "IndexInfo" 

CREATE TABLE system."IndexInfo" (
table_name text, 
index_name text, 
"" blob, 
PRIMARY KEY (table_name, index_name) 
) WITH COMPACT STORAGE 
AND CLUSTERING ORDER BY (index_name ASC) 
AND bloom_filter_fp_chance = 0.01 
AND caching = '{"keys":"ALL", "rows_per_partition":"NONE"}' 
AND comment = 'indexes that have been completed' 
AND compaction = {'min_threshold': '4', 'class': 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy', 'max_threshold': '32'} 
AND compression = {'sstable_compression': 'org.apache.cassandra.io.compress.LZ4Compressor'} 
AND dclocal_read_repair_chance = 0.0 
AND default_time_to_live = 0 
AND gc_grace_seconds = 0 
AND max_index_interval = 2048 
AND memtable_flush_period_in_ms = 3600000 
AND min_index_interval = 128 
AND read_repair_chance = 0.0 
AND speculative_retry = '99.0PERCENTILE'; 

cqlsh:system> select * from "IndexInfo"; 

table_name | index_name 
------------+--------------------------------- 
    musicdb | performer.performer_country_key 
    musicdb | performer.performer_style_key 
    musicdb |  user.user_preferences_key 

(3 rows)