SQLSTATE[HY000]: OCISessionBegin: ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux-x86_64 Error: 2: No such file or directory
Additional information: 4460
Additional information: 352924019
 (/root/php-7.0.33/ext/pdo_oci/oci_driver.c:691)