checkpoint buffers buffers
The option buffers indicates how many buffers must be written to the temporary log file before performing a checkpoint that commits ongoing transactions to disk. If this limit is reached while transactions are in process, the checkpoint will happen only after all transactions have finished to guarantee atomic transactions.
The smaller the number of buffers, less efficient will be the overall performance of the system, but the databases involved will be more often updated.
If the number of buffers is big, ZIM Backup Server, if running, will take more time to perform the backup process.
Regardless of the number of buffers, in case of a disk crash, ZIM server will automatically recover all consistent transactions present in the temporary transaction file.
A checkpoint is triggered whenever the number of checkpoint transactions or the number of checkpoint buffers happens first.
The number of buffers should always be less than the half of the number of Maximum Data Blocks; if this happens, the number of buffers is adjusted accordingly.
Valid Settings
Range between 1 and 1000000.
object sleep milliseconds
The time milliseconds indicates how long Zim Server has to wait before attempting again to obtain control over some objects (locks, buffers, etc.) that are not available in memory.
This sleep time is some sort of “last chance” to acquire resources in memory before resorting to a pending list of objects where the object will wait longer.
Valid Settings
Range between 0 to 600.
secondary lock groups nn
This option indicates how many groups of secondary locks Zim Server has to maintain in memory in order to control and apply locks on ongoing transactions for locks that cannot be held in a quick way (see Quick Locks).
Valid Settings
A number from 10 to 100,000.
record group size nn
This is the size of a group of information related to blocks of data, like quick locks, locks, references to a block and users accessing blocks. Each file (that is, record group) can have this many record groups to speed up to relationship between real blocks of data in memory and real blocks of data on disk.
Valid Settings
A number from 16 to 256.
maximum record groups nn
The number nn indicates how many files in total, for all databases, Zim Server can handle simultaneously, that is, kept open at same time.
Valid Settings
A number from 100 to 200,000.
secondary lock group size nn
This option indicates the size of each secondary group of locks that Zim Server has to maintain in memory in order to control and apply locks to ongoing transactions.
Valid Settings
A number from 10 to 50.
buffers per user buffers
This option specifies the number of buffers to be allocated by each user to process data provided by Zim Server. The buffer allocation happens only in the client side and is independent of locks.
Valid Settings
Any directory path.
server port number port
This configuration option establishes the port number used by Zim Server to talk to all the users that try to log on.
Valid Settings
A number from 1024 to 32765.
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