greenplum 常用SQL（不断更新）

-- 查询用户所建的表及其表中记录数（非精确值，取决于vacuum的频率，但用于分析足够精度了）

select a.relname,b.reltuples,b.relpages

from pg_stat_user_tables a,pg_class b

where a.relname=b.relname and b.relname like 'tb2014%' order by a.relname

创建GP表空间
psql gpdb
create tablespace TBS_DW_DATA filespace gpfsdw;
SET default_tablespace = TBS_DW_DATA;

删除GP数据库
gpdeletesystem -d /gpmaster/gpseg-1 -f

查看segment配置
select * from gp_segment_configuration;

文件系统
select * from pg_filespace_entry;

磁盘、数据库空间
SELECT * FROM gp_toolkit.gp_disk_free ORDER BY dfsegment;

SELECT * FROM gp_toolkit.gp_size_of_database ORDER BY sodddatname;

日志
SELECT * FROM gp_toolkit.__gp_log_master_ext;

SELECT * FROM gp_toolkit.__gp_log_segment_ext;

表描述
/d+ <tablename>

表分析
VACUUM ANALYZE tablename;

表数据分布
SELECT gp_segment_id, count(*) FROM <table_name> GROUP BY gp_segment_id;

表占用空间
SELECT relname as name, sotdsize/1024/1024 as size_MB, sotdtoastsize as toast, sotdadditionalsize as other
FROM gp_toolkit.gp_size_of_table_disk as sotd, pg_class
WHERE sotd.sotdoid = pg_class.oid ORDER BY relname;

索引占用空间
SELECT soisize/1024/1024 as size_MB, relname as indexname
FROM pg_class, gp_toolkit.gp_size_of_index
WHERE pg_class.oid = gp_size_of_index.soioid
AND pg_class.relkind='i';

OBJECT的操作统计
SELECT schemaname as schema, objname as table, usename as role, actionname as action, subtype as type, statime as time
FROM pg_stat_operations
WHERE objname = '<name>';

锁
SELECT locktype, database, c.relname, l.relation, l.transactionid, l.transaction, l.pid, l.mode, l.granted, a.current_query
FROM pg_locks l, pg_class c, pg_stat_activity a
WHERE l.relation=c.oid
AND l.pid=a.procpid
ORDER BY c.relname;

队列
SELECT * FROM pg_resqueue_status;

学习资料：

/article/4700354.html

http://blog.csdn.net/lsweetyy/article/details/7476468

http://francs3.blog.163.com/

http://www.postgresql.org/docs/8.2/static/functions-admin.html