postgres=#updatetssetdoc_tsv = to_tsvector(doc); postgres=#createindexonts using gin(doc_tsv); 该索引的可能结构如图所示: 与前面所有的图不同,对表行(tid)的引用是用黑色背景上的数值(页码和页面上的位置)表示的,而不是用箭头表示的。 1 2 3 4 5 6 7 8 9 10 11 12 13 postgres=#selectctid...
REPLICA IDENTITY { DEFAULT | USING INDEX index_name | FULL | NOTHING } 报错例子 postgres=# delete from c; ERROR: cannot delete from table "c" because it does not have replica identity and publishes deletes HINT: To enable deleting from the table, set REPLICA IDENTITY using ALTER TABLE...
postgres=# create index idx_t_hash_1 on t_hash using btree (info); ERROR: index row size 3720 exceeds maximum 2712 for index "idx_t_hash_1" HINT: Values larger than 1/3 of a buffer page cannot be indexed. Consider a function index of an MD5 hash of the value, or use full text...
postgres=# create index idx_t_hash_1 on t_hash using btree (info); ERROR: index row size 3720 exceeds maximum 2712 for index "idx_t_hash_1" HINT: Values larger than 1/3 of a buffer page cannot be indexed. Consider a function index of an MD5 hash of the value, or use full text...
postgres=# create index idx_t_hash_1 on t_hash using btree (info); ERROR: index row size 3720 exceeds maximum 2712 for index "idx_t_hash_1" HINT: Values larger than 1/3 of a buffer page cannot be indexed. Consider a function index of an MD5 hash of the value, or use full text...
altertabletable_nameREPLICAIDENTITY{DEFAULT|USINGINDEXindex_name |FULL|NOTHING} 报错例子 postgres=#deletefromc; ERROR: cannotdeletefromtable"c" because it doesnothavereplicaidentityandpublishes deletes HINT:Toenabledeletingfromthetable,setREPLICAIDENTITYusingALTERTABLE. ...
LIMIT select_limit_value { $$ = $2; } | LIMIT select_limit_value ',' select_offset_value { /* Disabled because it was too confusing, bjm 2002-02-18 */ ereport(ERROR, (errcode(ERRCODE_SYNTAX_ERROR), errmsg("LIMIT #,# syntax is not supported"), errhint("Use separate LIMIT and ...
判断元组删除是通过调用callback函数来实现,callback是一个函数指针,实际指向lazy_tid_reaped函数,而lazy_tid_reaped会校验index tuple的tid是否存在于dead tuple数组中(此外dead tuple数组是按照tid升序排列,所以在校验的时候会采用二分法)。 步骤2:使用deletable数组记录需要删除的元组。
hint text ,internal_query text ,internal_query_pos integer ,context text ,query text ,query_pos integer ,location text ,application_name text ) server pg_file_server options( filename '/data/pgdata/pg_log/postgresql.Tue.csv' ,format 'csv' ,header 'false' ,delimiter ',' ,quote '"' ,...
增加了OPT_PARAM Hint在SQL级别指定特定的参数值。 OPT_PARAM Hints PX多级分区表 支持多级分区的并行查询。 对分区表使用跨机并行查询 DML use GLOBAL INDEX 支持使用GLOBAL INDEX SCAN进行DML操作。 DML支持GLOBAL INDEX SCAN 支持GBK/GB18030编码 支持GBK/GB18030服务器编码格式。