Why should you use PLSQL_OPTIMIZE_LEVEL as 3 Mustafa, 2021-10-08 Hi, As you know PLSQL_OPTIMIZE_LEVEL parameter is used to optimize the codes while compiling them and it is really important. By default it’s value is 2 but you can increase it to 3 and you should, here is why. before begin, this is an extension for this post: https://mustafakalayci.me/2020/06/26/performance-gain-of-nocopy-parameters/ Very… Continue Reading
ORA-04036: PGA memory used by the instance exceeds PGA_AGGREGATE_LIMIT While Compiling a Huge PLSQL package Mustafa, 2021-09-28 Hello everyone, Lately, I faced with an interesting ORA-04036 errors at one of my clients’ development database. My notification modules alerted me about ORA-04036 error and I was just started to investigate trace files (and saw a package name frequently) and one of the developer sent me an email about… Continue Reading
Enable Unified Audit on Linux and Windows Mustafa, 2021-09-08 Hi, As you know, since 12c Oracle introduce Unified Auditing which has much more capabilities than standard auditing. Creating policies, audit conditions, top level auditing etc. By default Oracle uses “mixed” mode which allows you to run unified auditing commands and standard auditing. you can check if you are using… Continue Reading
V$DIAG_ALERT_EXT and equality conditions Mustafa, 2021-08-302021-11-18 Hello, I don’t know if this is a bug but something small took my attention. Codes below are run on 19.8 and 19.12 versions. Lately, I was working on alert log messages and to do that I use V$DIAG_ALERT_EXT view which is a row by row representation of alert log… Continue Reading
Blockchain vs Immutable tables Mustafa, 2021-08-202021-10-26 Hi, as you know 21c is here for linux and some new features are (as always) pretty exciting. two of them are Blockchain and Immutable tables. Let’s explain and test. first of all, those are new features for 21c but they are backported to 19c. at 19.10 you are able… Continue Reading
ORA-00600 [kzan_open_osfile:ksfdread] while querying/purging unified audit Mustafa, 2021-08-08 Hi everyone, Lately, I hit and ORA-600 while querying unified_audit_trail on 19.8 Oracle database and same thing happens if you want to purge audit data too. the exact error message is: ORA-00600: internal error code, arguments: [kzan_open_osfile:ksfdread], [], [], [], [], [], [], [], [], [], [], [] Normally, I… Continue Reading
X Forwarding for an Oracle DBA Mustafa, 2021-08-022021-08-02 Hi, It’s been a long time. I want to write something about X Forwarding. you might feel more comfortable to use a GUI instead of silent installations sometimes. if you are connecting to a linux server remotely then you must enable X Forwarding to enable GUI for Oracle product like… Continue Reading
Create a Clone DB from Backup on the Same Server (or remote) Mustafa, 2021-04-262021-04-27 Hi, I wanted to create a post series about cloning/duplicating database on the same or remote servers. There are so many options and combinations about this like rman duplicate database with/without target/source db connection, rman restore using backups, ASM to OS or OS to ASM, same server or remote server,… Continue Reading
Pragma UDF & Deterministic Mustafa, 2021-04-09 Hello everyone, I wanted to write about something simple and can improve the performance of your sql statements. Unfortunately, many database developers use too much plsql function in their SQL statements. I say too much because if you learn more about the SQL, you will use less plsql. SQL is… Continue Reading