系统表一般会以oid作为主键,分配oid时,PostgreSQL会通过主键索引检查新的oid是否在相应的系统表中已经存在, 如果存在则尝试下一个oid。 相关代码如下: Oid GetNewOidWithIndex(Relation relation, Oid indexId, AttrNumber oidcolumn) { Oid newOid; SnapshotData SnapshotDirty; SysScanDesc scan; ScanKeyData key...
This is an SQL-only extension for PostgreSQL that provides uniform functions for generating SQL Data Definition Language (DDL) scripts for objects created in a database. It contains a bunch of SQL functions to convert PostgreSQL system catalogs to nicely formatted snippets of SQL DDL, such as CR...
Before PostgreSQL 7.2, OIDs were mandatory, while before PostgreSQL 8.1 , OIDs were included by default on rows in user tables. This provided the marginal advantage of providing a potentially unique identifier to distinguish otherwise identical table rows, however this uniqueness can not be guaranteed...
To make sure that OIDplus runs on most systems, we have decided to support as many Database Management Systems (DBMS) as possible. Currently, OIDplus supports MySQL/MariaDB, Microsoft SQL Server, PostgreSQL, Oracle, Microsoft Access, SQLite3, and Firebird, either via native PHP extensions, AD...
PostgreSQL 使用递归SQL 找出数据库对象之间的依赖关系 - 例如视图依赖 create or replace function recursive_get_deps(IN tbl oid, OUT oid oid, OUT relkind "char", OUT nspname...name, OUT relname name, OUT deps oid[], OUT ori_oid oid, OUT ori_relkind "char", OUT ori_nspname name...t2...
Re: ERROR: Unable to locate type oid 0 in catalog... hi, first: thank you very much for your support ! I now get the last postgresql stable version... and here is the level 2 debug output : (I'm sorry for this, it's huge) ...
Object identifiers (OIDs) are used internally by PostgreSQL as primary keys for various system tables. OID通常被用于系统表的主键,进行系统表直接的链接。 The oid type is currently implemented as an unsigned four-byte integer. Therefore, it is not large enough to provide database-wide uniqueness i...
-bash-4.2$ cp pg_hba.conf postgresql.conf recovery.conf /opt/pgcnf/ -bash-4.2$ cd /home/pgdata-bash-4.2$ rm -rf *rm: cannot remove ‘base/90112/95992_fsm’: Structure needs cleaning##报错,这个文件夹删不掉rm: cannot remove ‘base/98794’: Structure needs cleaning-bash-4.2$ll ...
OID列是隐藏属性(https://www.postgresql.org/docs/10/static/catalog-pg-database.html), select * from pg_database是查不出来的,必须select oid from pg_database 这么明确的指定oid 关于OID的更多知识,请参考 《PostgreSQL数据库内核分析》一书第15页。
Re: Re: org.postgresql.util.PSQLException: ERROR: column "file" is of type oid but expression is of type bytea From Dave Cramer Date: 06 May 2016, 22:59:07 Peter, Perhaps this https://jdbc.postgresql.org/documentation/head/binary-data.html#binary-data-example can be of assistance ...