scylladb简单命令介绍

广大2年前 (2023-02-10)技术文章2288

一、cql 命令

查看版本
SHOW VERSION

查看连接的数据库地址
SHOW HOST

批量执行.cql文件中的命令
SOURCE '/home/thobbs/commands.cql'

开启和关闭命令追踪
TRACING ON
TRACING OFF

查看命令：
DESCRIBE CLUSTER
DESCRIBE SCHEMA
DESCRIBE KEYSPACES
DESCRIBE KEYSPACE <keyspace name>
DESCRIBE TABLES
DESCRIBE TABLE <table name>

增删查改相关命令：
CREATE KEYSPACE
USE
ALTER KEYSPACE
DROP KEYSPACE
CREATE TABLE
ALTER TABLE
DROP TABLE

官网cqlsh命令参考链接：https://docs.scylladb.com/stable/cql/cqlsh.html#

案例：

--cqlsh连接测试
[root@172-16-121-151 ~]# cqlsh 172.16.121.151
Connected to dtstack at 172.16.121.151:9042.
[cqlsh 5.0.1 | Cassandra 3.0.8 | CQL spec 3.3.1 | Native protocol v4]
Use HELP for help.
cqlsh>

--查看所有keyspace；
cqlsh> desc keyspaces;

test1 system_schema system      system_distributed system_traces
test2 system_auth    test_singe test                example

创建keyspace和表
cqlsh> CREATE KEYSPACE test3 WITH REPLICATION = {'class':'NetworkTopologyStrategy', 'my_data_center' : '3', 'my_data_center1' : '3'};
cqlsh> use test;
cqlsh:test> CREATE TABLE test(id int PRIMARY KEY, user_name varchar, age varchar, sex varchar, character varchar);
cqlsh:test> INSERT INTO test (id,user_name,age,sex,character) VALUES (1,'zhangsan', '18', 'man', 'funny');
cqlsh:test>
cqlsh:test> select * from test;

id | age | character | sex | user_name
----+-----+-----------+-----+-----------
  1 | 18 |     funny | man | zhangsan

--查看具体的keyspace
cqlsh:test> desc test;

CREATE KEYSPACE test WITH replication = {'class': 'NetworkTopologyStrategy', 'my_data_center': '3', 'my_data_center1': '3'} AND durable_writes = true;

CREATE TABLE test.test (
    id int PRIMARY KEY,
    age text,
    character text,
    sex text,
    user_name text
) WITH bloom_filter_fp_chance = 0.01
    AND caching = {'keys': 'ALL', 'rows_per_partition': 'ALL'}
    AND comment = ''
    AND compaction = {'class': 'SizeTieredCompactionStrategy'}
    AND compression = {'sstable_compression': 'org.apache.cassandra.io.compress.LZ4Compressor'}
    AND crc_check_chance = 1.0
    AND dclocal_read_repair_chance = 0.0
    AND default_time_to_live = 0
    AND gc_grace_seconds = 864000
    AND max_index_interval = 2048
    AND memtable_flush_period_in_ms = 0
    AND min_index_interval = 128
    AND read_repair_chance = 0.0
    AND speculative_retry = '99.0PERCENTILE';