Please replace the IP address with your master’s IP address. In the above command, you see an optional argument -R. When you pass -R, it automatically creates a recovery.conf file that contains the role of the DB instance and the details of its master. It is mandatory to create the ...
创建新用户test01并绑定到demospace– create user c##test01 identified by 123456 default tablespace demospace; 1. 赋予text01连接数据库的权限– grant create session to c##test01; 1. 赋予test01查询scott.emp表的权限(并获得权限的传递性)– grant select on scott.emp to test01 with grant option; ...
* make a copy of the array of lines, with token replaced by replacement * the first time it occurs on each line. * * This does most of what sed was used for in the shell script, but * doesn't need any regexp stuff. */ static char ** replace_token(char **lines, const char *...
substring('foobar'from'o.b') oobsubstring('foobar'from'o(.)b')o regexp_replace函数提供了将匹配 POSIX 正则表达式模式的子串替换为新文本的功能。 它的语法是 regexp_replace(source, pattern, replacement [, flags ])。 如果没有匹配pattern,那么返回不加修改的source串。 如果有匹配,则返回的source串...
Waiting to replace a page in WAL buffers. WALWriteLock Waiting for WAL buffers to be written to disk. ControlFileLock Waiting to read or update the control file or creation of a new WAL file. CheckpointLock Waiting to perform checkpoint. ...
CREATE OR REPLACE FUNCTION hello( TEXT ) RETURNS TEXT AS'example.so','hello'LANGUAGE C STRICT IMMUTABLE; Open a database with the PostgreSQL interactive command line editor'psql'asa user with permission to createnewfunctions (i.e. superuser). Create yournew'hello'function by loading the exampl...
空闲空间映射表(Free Space Map) 随着表格的不断插入与删除,文件块中必然会产生一些空闲空间。在插入元组时可以优先选择空闲空间进行存储(虽然一般而言是插入到表格最后的空闲空间),这需要在该表中众多拥有空闲空间的文件块之间进行选择,而遍历所有的文件块需要的开销是非常大的。因此PostgreSQL使用FSM文件来记录所有的表...
regexp_replace函数提供了将匹配 POSIX 正则表达式模式的子串替换为新文本的功能。 它的语法是 regexp_replace(source, pattern, replacement [, flags ])。 如果没有匹配pattern,那么返回不加修改的source串。 如果有匹配,则返回的source串里面的匹配子串将被replacement串替换掉。replacement串可以包含\``n, 其中\...
= nil { panic(err) } sql := strings.TrimSpace(line) if sql != "" { sqls = append(sqls, sql) } } return sqls } func main() { filepath := "file.sql" // Replace with your file path numThreads := 10 // Number of threads sqls := read_sqls(filepath) var wg...
New SSH Manager Connection Tree Filter Table Viewer Find and Replace data Box Selection Multi-Cell Editing Search Columns Web Viewer Memo Editor with syntax highlight Support Transaction Support animated gif in Image viewer Copy data as INSERT/UPDATE statement Table Designer Search Columns Field Type ...