01-07-2020
I would think that you are spending a lot of time in your loop repeatedly opening the database connection. Could you build all the queries into a single command file and execute one DB read? The output could be caught to a file or into a variable and then processed further. You might need to add extra columns to the output so you can tell which is from which query if that's necessary.
Can you tell us more about the overall aim of the process and perhaps we can help you towards a more efficient solution. The variable names don't give much away. Perhaps more meaning ful names (even if it takes marginally longer to type) will be far clearer to understand later on.
Kind regards,
Robin
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LEARN ABOUT FREEBSD
ng_bluetooth
NG_BLUETOOTH(4) BSD Kernel Interfaces Manual NG_BLUETOOTH(4)
NAME
ng_bluetooth -- placeholder for global Bluetooth variables
SYNOPSIS
#include <sys/types.h>
#include <netgraph/bluetooth/include/ng_bluetooth.h>
DESCRIPTION
The ng_bluetooth module is a placeholder for global Bluetooth variables. All Bluetooth variables can be examined and changed via sysctl(8).
Bluetooth Variables
Below is the description of default variables. Each Bluetooth module might add its own variables to the tree.
net.bluetooth.version
A read-only integer variable that shows the current version of the Bluetooth stack.
net.bluetooth.hci.command_timeout
A read-write integer variable that controls the Host Controller Interface (HCI) command timeout (in seconds), i.e., how long the HCI
layer will wait for the Command_Complete or Command_Status event from a Bluetooth device.
net.bluetooth.hci.connection_timeout
A read-write integer variable that controls the HCI connection timeout, i.e. how long the HCI layer will wait for the
Connection_Complete event. Normally this should not be required as Bluetooth devices have connection timeout of their own and will send
event back. This timeout is required to ensure that no connection will stall in case when the HCI transport layer is broken. Be care-
ful when changing this variable. Make sure you understand what you are doing.
net.bluetooth.hci.max_neighbor_age
A read-write integer variable that controls time-to-live (in seconds) for entries in the HCI neighbor cache. Every time a Bluetooth
device performs an Inquiry operation, the results will be put in cache. Later when a Bluetooth device establishes a baseband connec-
tion, it will try to find the matching entry in the cache and use it. This might speed up establishment of the baseband connection.
net.bluetooth.l2cap.rtx_timeout
A read-write integer variable that controls the Link Layer Control and Adaptation Protocol (L2CAP) Retransmission Timeout (RTX) (in sec-
onds). Every time the L2CAP layer submits a control command, the RTX timeout is set. The value of the RTX timeout should be greater or
equal to the value of the HCI connection timeout. Be careful when changing this variable. Make sure you understand what you are doing.
net.bluetooth.l2cap.ertx_timeout
A read-write integer variable that controls the L2CAP Extended Retransmission Timeout (ERTX) (in seconds). In some cases remote peer
may respond with PENDING status to the L2CAP control command. In this case the L2CAP command timeout is reset to the ERTX timeout
value. The value of the ERTX timeout should be greater or equal to the value of the RTX timeout. Be careful when changing this vari-
able. Make sure you understand what you are doing.
SEE ALSO
ng_btsocket(4), ng_hci(4), ng_l2cap(4), sysctl(8)
HISTORY
The ng_bluetooth module was implemented in FreeBSD 5.0.
AUTHORS
Maksim Yevmenkin <m_evmenkin@yahoo.com>
BSD
November 9, 2002 BSD