其行为类似于FOR SHARE,只是锁较弱:SELECT FOR UPDATE被阻止,而不是SELECT FOR NO KEY UPDATE。键共享锁会阻塞其他事务执行修改键值的DELETE或者UPDATE,但不会阻塞其他UPDATE,也不会阻止SELECT FOR NO KEY UPDATE、SELECT FOR SHARE或者SELECT FOR KEY SHARE。 5、行级锁冲突 要求的锁模式 当前的锁模式 FOR KEY ...
alter table 从表 add [constraint] [外键名称] foreign key (从表外键字段名) references 主表 (主表的主键); # 删除外键约束的语法: alter table 从表 drop foreign key 外键名称 ##外键约束案例: --添加约束: alter table product add CONSTRAINT fk_product_cid FOREIGN key (c_id) REFERENCES category...
This section describes meta-commands provided by gsql after the GaussDB(DWS) database CLI tool is used to connect to a database. A gsql meta-command can be anything that
则声称binlog数据 add_pke generate_mv_hash_pke,生成多个键值的hash值, generate_hash_pke generate_hash_pke,单个键值的hash值, check_foreign_key,生成外键的hash值,会生成键名,每个字段对应的值; Gtid_table_access_context::deinit System_table_access::close_table, ha_rollback_trans,如果失败,则回滚事务...
ADD DATAFILE 'filename' SIZE nn M; Make sure you specify the full path name for the filename. Use the script tsinfo.sql to find the size and related physical files of a tablespace. 27 Is my database running in Archivelog mode? Where are the archived files written?
ADD DATAFILE 'filename' SIZE nn M; Make sure you specify the full path name for the filename. Use the script tsinfo.sql to find the size and related physical files of a tablespace. 27 Is my database running in Archivelog mode? Where are the archived files written?
add image name into the drop down list Add JavaScript & CSS in UserControl Add multiple location paths into the web.config Add new column in existing CSV file using C# Add query string when user clicks back button Add Reference Issue Add rows to a Table in run time , one by one Add ...
SQL >SPOOL ON.SQL SQL >SELECT ‘ALTER VIEW ‘||TNAME||’ COMPILE;’ FROM TAB; SQL >SPOOL OFF 然后执行ON.SQL即可。 SQL >@ON.SQL 当然,授权和创建同义词也可以快速进行,如: SQL >SELECT ‘GRANT SELECT ON ’ ||TNAME||’ TO USERNAME;’ FROM TAB; SQL >SELECT ‘CREATE SYNONYM ‘||TNA...
If the -offlineMigration command included the ‑singleDataFile keyword, the mtk_hr_data.sql script will contain the commands required to re-create all of the objects in the new target database. Populate the database with the command: → WrapCopy acctg=# \i ./mtk_hr_data.sql Import opti...
$ xo pgsql://user:pass@host/db -o models --template-path templates The outermost template file for a generated struct is in templates/$DBTYPE.type.go.tpl. This is an excellent place to add a new method for all generated structs to have. For instance, if we have a timestamp field ...