We present a sample of 74 radio sources with recurrent jet activity .
The sample consists of 67 galaxies , 2 quasars , and 5 unidentified sources , selected from the published data as well as newly recognized .
The sample ’ s redshift range is 0.002 < z < 0.7 and the size of inner and outer structures varies from 0.02 to 4248 kpc .
We analyse the optical and radio properties of the sample and compare them with the characteristics of ordinary one-off FRII radio sources .
With the help of stellar population modelling we derive black hole masses and stellar masses of host galaxies of 35 restarting radio sources , finding that the black hole masses in restarting radio sources are comparable to those of typical single cycle FRII radio sources .
The obtained median values of log M _ { BH } are 8.58 M _ { \odot } and 8.62 M _ { \odot } , respectively .
Unlike the black hole masses , the stellar masses in restarting radio sources tend to be smaller than in the FRII sources .
Although the stellar populations of the hosts of recurrent activity sources are dominated by old stars , a significant fraction of young stars can be observed as well .
Based on the SDSS photometric observations , we also analyse the morphology of the host galaxies and obtained significantly smaller concentration indices for the restarting radio sources when compared to the classical FRII hosts .
This effect can be interpreted as a result of frequent merger events in the history of host galaxies of restarting radio sources .