oracle19c 打开pdb为只读模式
时间: 2024-09-06 12:06:07 浏览: 19
在Oracle数据库中,打开一个可插拔数据库(PDB)为只读模式通常是为了进行数据备份或其他不需要写入操作的场景。要将PDB设置为只读模式,你需要使用`ALTER PLUGGABLE DATABASE`命令。以下是具体的操作步骤:
1. 首先,你需要连接到Oracle数据库的CDB(容器数据库)中。可以使用如下SQL*Plus命令进行连接:
```
sqlplus / as sysdba
```
2. 连接成功后,执行以下命令将PDB设置为只读模式:
```
ALTER PLUGGABLE DATABASE <pdb_name> OPEN READ ONLY;
```
这里的`<pdb_name>`是你想要设置为只读模式的PDB的名称。
3. 如果PDB已经打开,上述命令会将其关闭然后以只读模式重新打开。如果PDB是关闭状态,它会以只读模式打开。
请注意,在将PDB设置为只读模式之前,确保没有正在进行的写入操作,以免数据不一致。此外,只读模式下,你无法对PDB执行任何修改数据的操作,如INSERT、UPDATE、DELETE或DDL语句。
在完成只读操作后,如果需要将PDB恢复为可读写模式,可以使用以下命令:
```
ALTER PLUGGABLE DATABASE <pdb_name> OPEN READ WRITE;
```
相关问题
oracle19c dbd pdb
Oracle19c introduces a new concept called Pluggable Databases (PDBs) in the Multitenant Architecture. PDBs are self-contained databases within the Oracle Database, allowing multiple databases to share the same database instance. Each PDB can be plugged in or unplugged from the container database (CDB) without affecting other PDBs.
To create a PDB in Oracle 19c, you can use the Database Configuration Assistant (DBCA) or run SQL commands. Here is an example of creating a PDB using SQL:
1. Connect to the CDB:
```
sqlplus sys/password@<CDB_SID> as sysdba
```
2. Create a new PDB:
```
CREATE PLUGGABLE DATABASE <PDB_NAME>
ADMIN USER <PDB_ADMIN_USER> IDENTIFIED BY <PDB_ADMIN_PASSWORD>
FILE_NAME_CONVERT=('<CDB_DATAFILE_DIR>','<PDB_DATAFILE_DIR>');
```
Replace <PDB_NAME> with the name of your PDB, <PDB_ADMIN_USER> and <PDB_ADMIN_PASSWORD> with the administrator username and password for the PDB, and <CDB_DATAFILE_DIR> and <PDB_DATAFILE_DIR> with the directory paths for data files in the CDB and PDB, respectively.
3. Open the new PDB:
```
ALTER PLUGGABLE DATABASE <PDB_NAME> OPEN;
```
You can now connect to the PDB using a separate connection string and perform operations specific to that PDB. Keep in mind that managing PDBs requires knowledge of Oracle Multitenant Architecture. I hope this helps! Let me know if you have any further questions.
Oracle 19c PDB
Oracle 19c PDB是指可插拔的数据库,用户可以在PDB自建数据库。在Oracle 19c中,有一个默认的PDB数据库,即PDB$SEED,用户可以以此库为模板创建自己的数据库。创建PDB数据库的命令如下:引用。
```
# create pluggable database NEWPDB admin user newxrg identified by 123456 roles=(dba,connect,resource) file_name_convert=('/opt/oracle/oradata/ORCLCDB/pdbseed','/opt/oracle/oradata/ORCLCDB/N;WPDB');
```