Month: August 2011

I could not find this quickly enough in google so I wrote it myself. The list of table privileges, with a connect by subquery. COL roles FOR a60 COL table_name FOR a30 col privilege for a9 set lin 200 trims on pages 0 emb on hea on newp none SELECT * FROM ( SELECT CONNECT_BY_ROOT […]

“Oftentimes, a database administrator (DBA) simply looks at the symptoms and immediately starts changing the system to fix those symptoms” Op. Cit. Oracle Database Performance Tuning Guide 11g Release 2 (11.2) Ok, let’s do this 🙂 Finding Waits on event “log file sync” while performing COMMIT and ROLLBACK operations were consuming significant database time. Action […]

Once upon a time a colleague asked me if there is a better editor than vi installed on my db server. Well, I was not really about arguing the benefit of ed (less memory usage, no useless error message). But one advantage of ed was (I believed) the ability to read large files $ vi […]

Do not expect a SQL answer there. My daughter (9) came from school with this question, and I suspect the expected homework was to google for an answer. I am pretty schocked of such practice, teacher encouraging google to do your homework are clearly not from my generation… Ok, back to the rules, pen and […]

I wrote on deferred segment creation recently. Today I was looking for specific storage attributes that I used to find in user_segments. They are no longer here. Where are they then? test case : create table t(x clob) store (x) as securefile x (retention max storage(maxsize 8192000000)); Where do I find the retention max max_size […]

There is more than one post on how to unload blob from the database, mostly in plsql with utl_file.put_raw (see note 330146.1) and with java with FileOutputStream (see note 247546.1) Unfortunately both are terribly slow due to the 32k limitation of put_raw in utl_file and due to a low “optimum buffer size” retrieved by myBlob.getBufferSize(), […]