Can you check to see if the cached values are being "lost" frequently (i.e. the sequence is not pinned and is getting aged-out) ? Hemant K Chitale From: LS Cheng [mailto:exriscer@xxxxxxxxx] Sent: Thursday, September 29, 2011 2:31 PM To: Chitale, Hemant Krishnarao Cc: oracle-l@xxxxxxxxxxxxx Subject: Re: Reading sequences is much slower in AIX 6.1 than Linux ops forgot to mention that, cache size is 500000 and noorder Thanks On Thu, Sep 29, 2011 at 7:30 AM, Chitale, Hemant Krishnarao <Hemant.Chitale@xxxxxx> wrote: What are the CACHE_SIZE and ORDER_FLAG (sometimes used in RAC) for the SEQUENCE_S1 sequence in the two environments ? Hemant K Chitale -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of LS Cheng Sent: Thursday, September 29, 2011 1:17 PM To: Oracle Mailinglist Subject: Reading sequences is much slower in AIX 6.1 than Linux Hi all We have some batch processes which need to meet some SLA, the execution time should exceed certaint threshold of time. The processes are mainly insert.... select sequence, ... from table. ...deleted...... This email and any attachments are confidential and may also be privileged. If you are not the addressee, do not disclose, copy, circulate or in any other way use or rely on the information contained in this email or any attachments. If received in error, notify the sender immediately and delete this email and any attachments from your system. Emails cannot be guaranteed to be secure or error free as the message and any attachments could be intercepted, corrupted, lost, delayed, incomplete or amended. Standard Chartered PLC and its subsidiaries do not accept liability for damage caused by this email or any attachments and may monitor email traffic. Standard Chartered PLC is incorporated in England with limited liability under company number 966425 and has its registered office at 1 Aldermanbury Square, London, EC2V 7SB. Standard Chartered Bank ("SCB") is incorporated in England with limited liability by Royal Charter 1853, under reference ZC18. The Principal Office of SCB is situated in England at 1 Aldermanbury Square, London EC2V 7SB. In the United Kingdom, SCB is authorised and regulated by the Financial Services Authority under FSA register number 114276. If you are receiving this email from SCB outside the UK, please click http://www.standardchartered.com/global/email_disclaimer.html to refer to the information on other jurisdictions. -- //www.freelists.org/webpage/oracle-l