Oracle XE 18c – How to fix the Oracle install error “unable to check for available memory”

November 7, 2021 oracle

Example run:

root@ox:/etc/init.d# ./oracle-xe-18c configure
/bin/df: unrecognized option '--direct'
Try '/bin/df --help' for more information.
Specify a password to be used for database accounts. Oracle recommends that the password entered should be at least 8 characters in length, contain at least 1 uppercase character, 1 lower case character and 1 digit [0-9]. Note that the same password will be used for SYS, SYSTEM and PDBADMIN accounts:
Confirm the password:
Configuring Oracle Listener.
Listener configuration succeeded.
Configuring Oracle Database XE.
[FATAL] [DBT-50000] Unable to check for available memory.

Database configuration failed. Check logs under '/opt/oracle/cfgtoollogs/dbca'.

Edit the configuration script:

nano /etc/init.d/oracle-xe-18c

Find the text: “Configuring Oracle Database“

Ex:

echo "Configuring Oracle Database $ORACLE_SID."

$SU -s /bin/bash  $ORACLE_OWNER -c "(echo '$ORACLE_PASSWORD'; echo '$ORACLE_PASSWORD'; echo '$ORACLE_PASSWORD') | $DBCA -silent -createDatabase -gdbName $ORACLE_SID -templateName $TEMPLATE_NAME -characterSet $CHARSET -createAsContainerDatabase $CREATE_AS_CDB -numberOfPDBs $NUMBER_OF_PDBS -pdbName $PDB_NAME -sid $ORACLE_SID -emConfiguration DBEXPRESS -emExpressPort $EM_EXPRESS_PORT -J-Doracle.assistants.dbca.validate.DBCredentials=false -sampleSchema true $SQLSCRIPT_CONSTRUCT $DBFILE_CONSTRUCT $MEMORY_CONSTRUCT"

Add this flag: -J-Doracle.assistants.dbca.validate.ConfigurationParams=false

It’ll look something like this:

$SU -s /bin/bash  $ORACLE_OWNER -c "(echo '$ORACLE_PASSWORD'; echo '$ORACLE_PASSWORD'; echo '$ORACLE_PASSWORD') | $DBCA -silent -createDatabase -gdbName $ORACLE_SID -templateName $TEMPLATE_NAME -characterSet $CHARSET -createAsContainerDatabase $CREATE_AS_CDB -numberOfPDBs $NUMBER_OF_PDBS -pdbName $PDB_NAME -sid $ORACLE_SID -emConfiguration DBEXPRESS -emExpressPort $EM_EXPRESS_PORT -J-Doracle.assistants.dbca.validate.DBCredentials=false -J-Doracle.assistants.dbca.validate.ConfigurationParams=false -sampleSchema true $SQLSCRIPT_CONSTRUCT $DBFILE_CONSTRUCT $MEMORY_CONSTRUCT"

Re-run the configuration script. Ex:

root@ox:/etc/init.d# ./oracle-xe-18c configure
/bin/df: unrecognized option '--direct'
Try '/bin/df --help' for more information.
Specify a password to be used for database accounts. Oracle recommends that the password entered should be at least 8 characters in length, contain at least 1 uppercase character, 1 lower case character and 1 digit [0-9]. Note that the same password will be used for SYS, SYSTEM and PDBADMIN accounts:
Confirm the password:
Configuring Oracle Listener.
Listener configuration succeeded.
Configuring Oracle Database XE.
Enter SYS user password:
**********
Enter SYSTEM user password:
********
Enter PDBADMIN User Password:
********
Prepare for db operation
7% complete
Copying database files
File "/etc/oratab" is not accessible.
29% complete
Creating and starting Oracle instance
30% complete
31% complete
34% complete
38% complete
41% complete
43% complete
Completing Database Creation
47% complete
50% complete
Creating Pluggable Databases
54% complete
71% complete
Executing Post Configuration Actions
93% complete
Running Custom Scripts
100% complete
Database creation complete. For details check the logfiles at:
/opt/oracle/cfgtoollogs/dbca/XE.
Database Information:
Global Database Name:XE
System Identifier(SID):XE
Look at the log file "/opt/oracle/cfgtoollogs/dbca/XE/XE.log" for further details.

Connect to Oracle Database using one of the connect strings:
Pluggable database: ox:1539/XEPDB1
Multitenant container database: ox:1539
Use https://localhost:5500/em to access Oracle Enterprise Manager for Oracle Database XE
root@ox:/etc/init.d#