我们可以在“do”步骤中使用它来支持清理——如果存在,则drop index concurrently,让 create index concurrently干净地执行: 1 2 3 4 5 6 7 postgres=#dropindexconcurrently if exists abce_title_idx; DROPINDEX postgres=# postgres=#createindexconcurrently ifnotexists abce_title_idx onabce using btree (tit...
CREATE INDEX IF NOT EXISTS foo_idx ON foo(id); -- hangs awaiting ExclusiveLock Rolling back the transaction in client 1 gives the NOTICE: relation "foo_idx" already exists, skipping message in client 2. CREATE INDEX CONCURRENTLY IF NOT EXISTS foo_idx on foo(id) goes through immediately....
4.创建索引 --建普通索引(索引名通常为 idx_表名_字段名)CREATEINDEXIFNOTEXISTSidx_my_table_ageONmy_table USING btree (age);--建唯一索引CREATEUNIQUEINDEXCONCURRENTLYIFNOTEXISTSidx_unique_my_table_idONmy_table (id);--组合索引CREATEINDEXIFNOTEXISTSindex_nameONtable_name (column1_name, column2_nam...
CREATE[UNIQUE]INDEX[CONCURRENTLY][[IFNOTEXISTS]name]ON[ONLY]table_name[USINGmethod]({column_name|(expression)}[COLLATEcollation][opclass[(opclass_parameter=value[,...])]][ASC|DESC][NULLS{FIRST|LAST}][,...])[INCLUDE(column_name[,...])][WITH(storage_parameter[=value][,...])][TABLESP...
("CreateTime"); CREATE UNIQUE INDEX IF NOT EXISTS u_idx_AdsARH_CT_N ON "o"."A"("CreateTime","Number"); CREATE INDEX if not exists idx_AdsARH_AdsCId_AdsAId ON "orders"."A" USING btree ("CId","AId"); --add partition DO $do$ DECLARE r_year record; r_month record; v_...
CREATE EXTENSION IF NOT EXISTS btree_gin;CREATE EXTENSION IF NOT EXISTS pg_trgm;CREATE INDEX index_users_on_email_gin ON users USING gin (email gin_trgm_ops); 让我们重新运行我们的查询: EXPLAIN ANALYZE SELECT * FROM usersWHERE email LIKE '%@example.com';Bitmap Heap Scan on users Recheck ...
CREATE EXTENSION IF NOT EXISTS btree_gin; CREATE EXTENSION IF NOT EXISTS pg_trgm; CREATE INDEX index_users_on_email_gin ON users USING gin (email gin_trgm_ops); 让我们重新运行我们的查询: EXPLAIN ANALYZE SELECT * FROM users WHERE email LIKE '%@example.com'; 代码语言:javascript 复制 Bitmap...
drop index if exists "t_user_pkey"; alter table "t_user" add constraint "t_user_pkey" primary key ("ID"); 根据已有表结构创建表 create table if not exists 新表 (like 旧表 including indexes including comments including defaults);
createuser dropdb dropuser ecpg initdb oid2name pg_amcheck pg_archivecleanup pg_basebackup pgbench pg_checksums pg_config pg_controldata pg_ctl pg_dump pg_dumpall pg_isready pg_receivewal pg_recvlogical pg_resetwal pg_restore pg_rewind
create index 索引名 on 表名[usingmethod](列名1,列名2,..);二、删除索引 drop index[concurrently][ifexists]索引名[cascade|restrict];参数解释: concurrently 在表上删除索引的同时不对查询,插入,更新,删除加锁。 普通的DROPINDEX 会使表获得独占锁,阻塞其他的访问,直到 ...