PDB的基本管理

1. 查看当前数据的状态和信息

SQL> select name,decode(cdb, 'YES', 'Multitenant Option enabled', 'Regular 12c Database: ') "Multitenant Option" , open_mode, con_id from v$database;
NAME Multitenant Option OPEN_MODE CON_ID
--------- -------------------------- -------------------- ----------
ZYLONG Multitenant Option enabled READ WRITE 0
2. 查看PDB信息
SQL> show pdbs;

CON_ID CON_NAME OPEN MODE RESTRICTED
---------- ------------------------------ ---------- ----------
2 PDB$SEED READ ONLY NO
3 SEED_PDB READ WRITE NO
4 NONCDB_PDP READ WRITE NO
5 CLON_PDB READ WRITE NO
3. 切换到PDB数据库
SQL> alter session set container=seed_pdb;
Session altered.

SQL> show pdbs;

CON_ID CON_NAME OPEN MODE RESTRICTED
---------- ------------------------------ ---------- ----------
3 SEED_PDB READ WRITE NO
4. 关闭和启动PDB
##第一种方式

SQL> conn / as sysdba
Connected.
SQL> alter pluggable database clon_pdb close;
Pluggable database altered.

SQL> show pdbs;
CON_ID CON_NAME OPEN MODE RESTRICTED
---------- ------------------------------ ---------- ----------
2 PDB$SEED READ ONLY NO
3 SEED_PDB READ WRITE NO
4 NONCDB_PDP READ WRITE NO
5 CLON_PDB MOUNTED
SQL> alter pluggable database clon_pdb open;
Pluggable database altered.

SQL> show pdbs;

CON_ID CON_NAME OPEN MODE RESTRICTED
---------- ------------------------------ ---------- ----------
2 PDB$SEED READ ONLY NO
3 SEED_PDB READ WRITE NO
4 NONCDB_PDP READ WRITE NO
5 CLON_PDB READ WRITE NO##第二种方式

SQL> alter session set container=CLON_PDB;
Session altered.

SQL> shutdown immediate
Pluggable Database closed.
SQL> show pdbs;
CON_ID CON_NAME                       OPEN MODE  RESTRICTED
---------- ------------------------------ ---------- ----------
5 CLON_PDB                       MOUNTED
SQL> startup;
Pluggable Database opened.
SQL> show pdbs;
CON_ID CON_NAME                       OPEN MODE  RESTRICTED
---------- ------------------------------ ---------- ----------
5 CLON_PDB                       READ WRITE NO

5. 删除PDB，添加including datafiles选项，数据文件也会删除
SQL> alter pluggable database clon_pdb close;
SQL> drop pluggable database clon_pdb including datafiles;
6. 当CDB重启,保存PDB之前的打开状态
12c中一个CDB中可以有多个PDB，当重启了CDB，默认情况下PDB是不会打开的。

6.1 12CR1通过触发器

##CDB下创建一个触发器,打开所有PDB

CREATE TRIGGER open_all_pdbs
AFTER STARTUP
ON DATABASE
BEGIN
EXECUTE IMMEDIATE 'alter pluggable database all open';
END open_all_pdbs;
/
6.2 12CR2通过新特性SAVE STATE
通过SAVE STATE保存CDB重启前PDB的状态。这样重启CDB之后，会自动打开PDB到之前的状态。

保存PDB1打开状态

ALTER PLUGGABLE DATABASE pdb1 SAVE STATE;取消PDB1保存打开状态

ALTER PLUGGABLE DATABASE pdb1 DISCARD STATE;

保存所有PDB打开状态

ALTER PLUGGABLE DATABASE ALL SAVE STATE;

保存几个PDB打开状态

ALTER PLUGGABLE DATABASE pdb1,pdb2,pdb3 SAVE STATE;

保存除了PDB salespdb之外所有PDB的打开状态

ALTER PLUGGABLE DATABASE ALL EXCEPT salespdb SAVE STATE;