Oracle Database

In May 2014, the following #oratidbit relating to invisible columns were tweeted. In #DB12c, you can make a column in table as INVISIBLE. When you make it invisible, the COL# column in COL$ dictionary is updated to 0, thus is not included in the “SELECT *” or “INSERT INTO VALUES”, unless specifically selected. When you … Read more

There are several background processes running when you start Oracle Database 12c instance. Here is an example from one of the 12.1.0.2 instances.    ora_acms_bt9prod1  ora_lreg_bt9prod1 ora_p00w_bt9prod1  ora_aqpc_bt9prod1  ora_m000_bt9prod1  ora_p00x_bt9prod1  ora_asmb_bt9prod1  ora_mark_bt9prod1  ora_p00y_bt9prod1  ora_cjq0_bt9prod1  ora_mman_bt9prod1  ora_p00z_bt9prod1  ora_ckpt_bt9prod1  ora_mmnl_bt9prod1  ora_ping_bt9prod1  ora_dbrm_bt9prod1  ora_mmon_bt9prod1  ora_pmon_bt9prod1  ora_dbw0_bt9prod1  ora_o000_bt9prod1  ora_ppa6_bt9prod1  ora_dbw1_bt9prod1  ora_p000_bt9prod1  ora_ppa7_bt9prod1  ora_dbw2_bt9prod1  ora_p001_bt9prod1  ora_psp0_bt9prod1  ora_dbw3_bt9prod1  ora_p002_bt9prod1  ora_pxmn_bt9prod1  ora_dbw4_bt9prod1 … Read more